[Q24-Q43] The Most Efficient JN0-364 Pdf Dumps For Assured Success [2026]

The Most Efficient JN0-364 Pdf Dumps For Assured Success [2026]

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NEW QUESTION # 24
Exhibit:

Referring to the exhibit, R1 and R2 are advertising the same prefix 203.0.113.0/24 to R3 and R4 over EBGP. R3 and R4 both advertise this prefix to R5. Which advertisement does R5 choose to install in its routing table?

• A. The advertisement from R3 is chosen.
• B. The advertisement from R4 is chosen.
• C. The advertisements from both R3 and R4, but R3 is chosen for forwarding.
• D. The advertisements from both R3 and R4, but R4 is chosen for forwarding.

Answer: B

Explanation:
In a Juniper Networks environment, when a router receives multiple BGP paths for the same destination prefix, it utilizes theBGP Path Selection Algorithmto determine the single "best" path to install in the routing table and advertise to other peers. This selection process follows a strict hierarchy of attributes.
According to Juniper Networks technical documentation, the very first attribute evaluated by the BGP process (after ensuring the next hop is reachable) is theLocal Preference. Local preference is a well-known discretionary attribute used to communicate a preference for a specific exit point from the local Autonomous System (AS). A higher local preference value is always preferred over a lower one.
Analyzing the exhibit:
* R3receives the prefix from R1 and applies an export policy to its IBGP session that sets thelocal preference to 150.
* R4receives the same prefix from R2 and applies an export policy to its IBGP session that sets thelocal preference to 200.
* R5receives both of these IBGP updates from R3 and R4.
When R5 runs the best-path algorithm for the 203.0.113.0/24 prefix, it compares the local preference values.
Since the path from R4 has a local preference of 200 and the path from R3 has a local preference of 150, R5 immediately selects the path fromR4as the best route. Because BGP is designed to prevent loops and maintain a consistent view, only this single best path is installed as the active route in R5's routing table (inet.0).
Options B and D are incorrect because they imply multiple paths are installed for forwarding, which only occurs if specific multipath load-balancing is configured, which is not indicated here.

NEW QUESTION # 25
You are evaluating BGP between two Juniper routers and the BGP session is stuck in the Idle state. What would cause this behavior?

• A. The BGP group type is set to internal instead of external.
• B. The local AS number is missing.
• C. The BGP hold time is too short.
• D. The peer IP address is incorrect.

Answer: D

Explanation:
In the BGP Finite State Machine (FSM), theIdlestate is the first stage of any BGP connection. When a BGP session is "stuck" in Idle, it typically indicates that the router is unable to even begin the process of establishing a TCP connection with its neighbor. According to Juniper Networks documentation, before BGP can transition to theConnectorActivestates, it must have a valid route to the neighbor's IP address in the routing table and be able to initiate a three-way TCP handshake on port 179.
If thepeer IP address is incorrect(Option D), the router may not have a route to that destination, or it may be attempting to connect to a non-existent or unreachable host. In many Junos configurations, if the underlying IGP (OSPF/IS-IS) or static routing cannot provide reachability to the neighbor address defined in the BGP configuration, the BGP process will remain in the Idle state and periodically retry the connection.
Regarding the other options:
* The local AS number is missing (Option C):In Junos, you cannot commit a BGP configuration if the local autonomous system is not defined at either the [edit routing-options] level or within the BGP group itself. The commit check would fail before the session could even attempt to start.
* The BGP group type (Option B):Having a mismatch in group type (internal vs. external) usually results in the session reaching theOpenSentorOpenConfirmstate before failing due to an
"unacceptable AS" error in the OPEN message.
* BGP hold time (Option A):Issues with hold timers or keepalives generally cause a session that is already in theEstablishedstate to drop; they do not prevent the session from leaving the Idle state.

NEW QUESTION # 26
A service provider is onboarding a new enterprise customer that operates multiple branch offices, each with its own set of VLANs. The customer requires transparent Layer 2 connectivity between sites while maintaining separation of internal VLANs. The provider must also ensure that customer VLAN identifiers do not conflict with other customers on the shared infrastructure. Which solution would provide the desired results?

• A. Provide Internet access with NAT and firewall services.
• B. Extend customer VLANs using Q-in-Q tunneling.
• C. Aggregate customer traffic using GRE tunnels.
• D. Deliver Layer 3 VPN services using MPLS.

Answer: B

Explanation:
In a service provider environment,Q-in-Q tunneling(also known as 802.1ad or double-tagging) is the standard solution for transporting multiple customer VLANs over a shared provider backbone while maintaining total separation.
According to Juniper Networks documentation, Q-in-Q works by adding a second 802.1Q tag (theService Provider tagor S-tag) to the customer's already tagged frames (theCustomer tagor C-tag). This creates a
"tunnel" at Layer 2. This solution specifically addresses all the customer's requirements:
* Transparent Layer 2 Connectivity:Because the provider simply encapsulates the customer's frames, the customer's internal BPDU traffic (like Spanning Tree) and VLAN tags are preserved and delivered transparently to the remote site.
* Separation of Internal VLANs:The customer can run their own internal VLAN IDs (1-4094) without the provider needing to know or manage them.
* Conflict Avoidance:Different customers on the same provider infrastructure are assigned unique S- tags. Even if two different customers both use "VLAN 10" internally, they remain isolated because their traffic is encapsulated in different provider S-tags.
Why other options are incorrect:
* Layer 3 VPN (Option B):While MPLS L3VPNs are common, they provide Layer 3 (IP) connectivity, not the "transparent Layer 2" connectivity requested.
* GRE Tunnels (Option C):GRE is a Layer 3 encapsulation and does not natively provide the transparent VLAN bridging required for a multi-site Layer 2 service.
* NAT/Firewall (Option D):These are security and address-translation services for internet access and do not facilitate site-to-site Layer 2 bridging.

NEW QUESTION # 27
Which feature allows Junos OS to perform recursive lookups for static route next hops?

• A. resolve
• B. discard
• C. next-table
• D. reject

Answer: A

Explanation:
In standard routing, astatic routeis typically considered valid only if the specified next-hop IP address is directly reachable on a local subnet. However, in complex service provider designs, the next-hop might be a
"distant" IP address that is reachable through another route (such as a BGP route or another static route). This process of looking up a next-hop within another routing entry is calledrecursive lookup.
In Junos OS, theresolve (Option A)parameter is explicitly used to enable this behavior for static routes.
According to Juniper technical documentation, when you append the resolve keyword to a static route configuration, you are instructing the Routing Engine to search the routing table to find a path to that distant next-hop.
For example:
set routing-options static route 10.1.1.0/24 next-hop 192.168.100.1 resolve If 192.168.100.1 is not on a local interface but is reachable via an OSPF route, the router will "resolve" the path and install the 10.1.1.0/24 route into the forwarding table using the OSPF path's exit interface.
Why other options are incorrect:
* Discard (Option B)andReject (Option C)are "next-hop types" used to drop traffic, either silently (discard) or by sending an ICMP unreachable message (reject).
* Next-table (Option D)is used forInter-VRF routing, where the router is told to look up the destination in a completely different routing instance (like a VRF table), which is a different architectural function than a recursive next-hop lookup within the same table.

NEW QUESTION # 28
What prevents routing loops in a single-area OSPF network?

• A. Routing policies
• B. Forwarding policies
• C. The Dijkstra algorithm
• D. The Bellman-Ford algorithm

Answer: C

Explanation:
In OSPF, loop prevention within a single area is achieved through the fundamental nature of its link-state architecture. Unlike distance-vector protocols that rely on "routing by rumor," OSPF ensures that every router within an area maintains an identicalLink-State Database (LSDB). This database acts as a complete map of the network topology.
Once the LSDB is synchronized, each router independently executes theShortest Path First (SPF) algorithm
, which is formally known as theDijkstra algorithm. This mathematical process treats the local router as the
"root" of a tree and calculates the shortest path to every other node (router) and prefix in the area based on the cumulative interface costs. Because every router uses the same synchronized map (the LSDB) and the same deterministic algorithm, they all arrive at a consistent, loop-free view of the best paths.
According to Juniper Networks technical documentation, the Dijkstra algorithm is superior to theBellman- Ford algorithm(used by distance-vector protocols like RIP) in this regard. Bellman-Ford is susceptible to
"count-to-infinity" problems and loops because routers only know the distance and direction to a destination provided by their neighbors, rather than the full topology. In OSPF, even if a link fails, the updated Link-State Advertisement (LSA) is flooded rapidly, and the Dijkstra algorithm is re-run to find a new loop-free path.
Routing policies(Option B) are used to manipulate path selection or filter routes but are not the primary mechanism for fundamental loop prevention in OSPF. Similarly,forwarding policies(Option D) govern how traffic is handled at the data plane level rather than determining the control plane's loop-free topology.

NEW QUESTION # 29
Exhibit:
user@Router-1> show route 172.24/16
inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
...
172.24.0.0/24 *[OSPF/150] 01:31:31, metric 0, tag 0
> to 172.20.0.2 via ge-0/0/2.0
to 172.20.1.2 via ge-0/0/3.0
user@Router-1> show route forwarding-table
Routing table: default.inet
Internet:
Destination Type RtRef Next hop Type Index NhRef Netif
...
172.24.0.0/24 user 0
172.20.0.2 ucst 551 2 ge-0/0/2.0
172.20.1.2 ucst 552 2 ge-0/0/3.0
Referring to the exhibit, which two statements are true? (Choose two.)

• A. The router is performing default route load-balancing behavior.
• B. This router will only choose the next hop with a > next to it in the routing table.
• C. This router will choose both next hops in the routing table.
• D. The default route load-balancing behavior of this router has been modified.

Answer: C,D

Explanation:
In Junos OS, understanding the distinction between theRouting Information Base (RIB)and theForwarding Information Base (FIB)is fundamental to analyzing traffic patterns and load-balancing behavior. The RIB (show route) contains all prefixes learned via various protocols, while the FIB (show route forwarding-table) contains only the active next-hops that are actually programmed into the Packet Forwarding Engine (PFE).
According to Juniper Networks technical documentation, the default behavior for Junos OS when encounteringEqual-Cost Multipath (ECMP)routes is to select only a single next-hop from the available candidates in the RIB and install that single path into the FIB. In a default state, even if the show route output displays multiple next-hops for a destination like 172.24.0.0/24, only one would have the active route symbol (
>) and only that one would appear in the forwarding table.
In the provided exhibit, the show route output shows two next-hops for 172.24.0.0/24, but only the first one (172.20.0.2) is marked with the>symbol as the active selection. However, the subsequent show route forwarding-table output reveals thatboth next-hops(172.20.0.2 and 172.20.1.2) are currently present in the forwarding table for that same destination. This discrepancy indicates that thedefault load-balancing behavior has been modified (Option B). This modification is typically achieved by creating a routing policy with the action then load-balance per-packet (which actually results in flow-based load balancing) and applying it to the forwarding table via the export statement under [edit routing-options forwarding-table].
Because the forwarding table now contains both next-hops, the router is no longer restricted to a single path.
Therefore, therouter will choose both next-hops in the routing table (Option D)for packet forwarding, distributing flows across the two available Gigabit Ethernet interfaces (ge-0/0/2.0 and ge-0/0/3.0). This ensures higher utilized bandwidth and provides redundancy at the data plane level.

NEW QUESTION # 30
In IS-IS, what would you use to control which external routes are installed in the routing table?

• A. interface metric
• B. route preference
• C. export policy
• D. import policy

Answer: D

Explanation:
In Junos OS, the flow of routing information is managed by policies that sit between the protocol's database (the RIB-In/LSDB) and the main routing table (inet.0). Understanding the direction of these policies is critical for correct configuration.
Animport policy (Option B)is used to control the movement of routes from a routing protocol into the routing table. According to Juniper Service Provider documentation, even though IS-IS is a link-state protocol that requires all routers in an area to have an identical Link-State Database (LSDB), animport policycan be used to filter which of those validated routes are actually placed into inet.0 for forwarding. For external routes (routes leaked into IS-IS from other areas or protocols), an import policy allows an administrator to selectively accept or reject prefixes based on specific criteria like prefix-lists or community tags.
It is important to distinguish this from anexport policy (Option A). In Junos, an export policy is used to take routesalready inthe routing table and push themoutto a protocol to be advertised to neighbors. For example, you would use an export policy to redistribute static routes into IS-IS.Route preference (Option C)is a global value used to select between different protocols for the same prefix, and theinterface metric (Option D)is used by the SPF algorithm to calculate the shortest path within the IS-IS database itself. Therefore, to specifically control which learned external routes are "installed" into the forwarding table, theimport policyis the correct tool.

NEW QUESTION # 31
You are designing an MPLS network and want to ensure that traffic traverses an LSP between PE routers that follow an explicit path through the core. Which protocol would accomplish this task?

• A. IS-IS
• B. LDP
• C. BGP
• D. RSVP

Answer: D

Explanation:
In a Juniper Networks MPLS environment, the selection of a signaling protocol depends heavily on the requirement for traffic engineering and path control. To satisfy the requirement for anexplicit path-where the network architect defines specific hop-by-hop routers that the traffic must traverse-theResource Reservation Protocol (RSVP)is the necessary choice.
According to Juniper documentation, RSVP (specifically RSVP-TE) supports the use ofExplicit Route Objects (EROs). When you configure an LSP in Junos OS, you can define a path consisting of a series of IP addresses (strict or loose hops). RSVP then signals the LSP along that exact sequence of routers, reserving resources and establishing labels as it goes. This allows for precise control over the network's traffic patterns, enabling administrators to steer traffic away from congested links or toward specific high-bandwidth paths.
In contrast,LDP (Label Distribution Protocol)(Option D) is a "best-effort" signaling protocol. LDP strictly follows the Interior Gateway Protocol (IGP) shortest path. It does not support explicit paths or traffic engineering constraints; it simply builds a "mesh" of labels based on the existing routing table.IS-IS(Option C) is an IGP used to populate the routing table and TED but does not signal labels.BGP(Option A) is used for service delivery (like L3VPNs) but relies on an underlying transport LSP (built by RSVP or LDP) to reach its next hop. Therefore, only RSVP provides the mechanism for explicit path manipulation.

NEW QUESTION # 32
A BGP router receives two routes to the same prefix. One route has a higher local preference, while the other has a shorter AS path. In this scenario, which route would be selected?

• A. The route with the lower origin code.
• B. The route with the shorter AS path.
• C. The route with the lowest MED value.
• D. The route with the higher local preference.

Answer: D

Explanation:
TheBGP path selection algorithmis a deterministic process used by Juniper routers to select the single "best" path from the BGP table to be placed into the routing table (inet.0). This algorithm follows a specific, hierarchical set of rules. According to Juniper Networks technical documentation, the router evaluates attributes in a fixed order, and once a tie is broken at a specific step, the remaining steps are ignored.
The order of the primary BGP attributes in Junos OS is as follows:
* Highest Local Preference:This is the first attribute evaluated after the basic check for a reachable next hop. Local preference is used within an Autonomous System (AS) to prioritize one exit point over another.
* Shortest AS_PATH:If the local preference is equal, the router then evaluates the length of the AS_PATH attribute.
* Lowest Origin Code:(IGP < EGP < Incomplete).
* Lowest Multi-Exit Discriminator (MED).
In this specific scenario, the router compares a path with ahigher local preferenceagainst a path with a shorter AS path. Because theLocal Preferencecheck occurs at Step 1 and theAS_PATHcheck occurs later at Step 2, the router will select the path with the higher local preference immediately. The length of the AS path becomes irrelevant in this comparison because the tie was already broken by the local preference value.
This allows network administrators to override the default "shortest path" logic of BGP to prefer specific providers or links based on business requirements.

NEW QUESTION # 33
Exhibit:

You have configured IPv4 and IPv6 in your network and all OSPF neighbors are established. You apply the configuration shown in the exhibit. Which statement is true in this scenario?

• A. There will only be an OSPFv3 entry in R1 for network 172.16.2.0/24.
• B. There will only be an OSPFv2 entry in R1 for network 172.16.2.0/24.
• C. There will not be a route in R1 for network 172.16.2.0/24.
• D. There will be an OSPFv2 and OSPFv3 entry in R1 for network 172.16.2.0/24.

Answer: D

Explanation:
In a Juniper Networks environment running Junos OS, understanding the interaction between different versions of OSPF is essential for multi-protocol environments.OSPFv2(defined in RFC 2328) is the standard protocol used for routing IPv4 unicast traffic.OSPFv3(defined in RFC 5340) was originally developed to support IPv6 routing. However, OSPFv3 was later extended via RFC 5838 to support multiple address families (AF), allowing it to carry IPv4 unicast, IPv4 multicast, and other address types within a single OSPF instance.
According to Juniper technical documentation, Junos OS implements this multi-AF support in OSPFv3 through the use ofrealms. When the realm ipv4-unicast statement is configured under the [edit protocols ospf3] hierarchy, the OSPFv3 process becomes capable of calculating and advertising IPv4 routes.
In the provided exhibit, routerR2has a dual-protocol configuration. First, it is running standard OSPFv2, with the ge-0/0/1.0 interface (which is directly connected to the 172.16.2.0/24 network) participating in Area 0.
This ensures that the prefix is advertised as a standard IPv4 LSA to its neighbor,R1. Second, R2 is running OSPFv3 with the realm ipv4-unicast specifically enabled on that same ge-0/0/1.0 interface. Because of this realm, OSPFv3 also treats the 172.16.2.0/24 prefix as a reachable IPv4 destination and advertises it to R1 as an OSPFv3 IPv4-unicast LSA.
As a result, whenR1(which is also running both protocols) receives these routing updates, it will see the same destination prefix advertised by two different protocols. Its routing table (inet.0) will contain one entry learned from the OSPFv2 process and a second, separate entry learned from the OSPFv3 process. While the Junos Routing Engine will ultimately select one as the "active" route based on route preference (both protocols have a default preference of 10), both entries will technically exist within the Routing Information Base (RIB). This confirms that statementBis the correct description of the operational state of the network.
=========

NEW QUESTION # 34
For two or more switches to participate in the same MSTP region, which parameter must match?

• A. Root bridge priority
• B. Region name
• C. Root bridge ID
• D. Extended system ID

Answer: B

Explanation:
Multiple Spanning Tree Protocol (MSTP), as defined in IEEE 802.1s and implemented in Juniper Networks Junos OS, allows for the grouping of VLANs into specific spanning tree instances. This provides significant scalability and load-balancing advantages over traditional STP or RSTP. To achieve this, switches must be grouped into logical "Regions." According to Juniper documentation, for two or more switches to be considered part of the sameMSTP Region, they must possess an identicalMSTP Configuration Identifier. This identifier consists of three specific attributes that must match exactly across all participating switches:
* MSTI Name (Region Name):A descriptive string (up to 32 characters) that identifies the region.
* MSTI Revision Level:A numerical value (0-65535) used to track configuration changes.
* VLAN-to-Instance Mapping:The specific table that defines which VLAN IDs are associated with which Multiple Spanning Tree Instances (MSTIs).
If even one of these parameters-such as theRegion name(Option A)-differs, the switches will treat each other as being in separate regions. When switches are in different regions, they interact using theCommon Spanning Tree (CST), effectively seeing the other region as a single "virtual bridge," which limits the granularity of traffic engineering.
TheExtended system ID(Option B) is a component of the Bridge ID used to carry VLAN information in PVST+ but is not a region-matching requirement.Root bridge priority(Option C) andRoot bridge ID(Option D) are variables used during the STP election process to determine the topology's root, but they do not define the boundaries of an MSTP region itself.

NEW QUESTION # 35
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?

• A. rewrite
• B. pop
• C. swap
• D. push

Answer: B

Explanation:
In a Multiprotocol Label Switching (MPLS) environment, label operations are categorized into three primary actions:Push(adding a label),Swap(replacing a label), andPop(removing a label). The specific behavior described in the question refers to a mechanism calledPenultimate Hop Popping (PHP).
According to Juniper Networks technical documentation, the goal of PHP is to improve forwarding efficiency at the egress point of a Label-Switched Path (LSP). TheEgress Label Edge Router (LER), which is the final destination for the LSP, would normally have to perform two lookups if it received a labeled packet: first, it would look up the label in its MPLS table to see it is the destination, and second, it would look up the underlying IP payload in its IP routing table (inet.0) to forward the packet.
To alleviate this burden, the Egress LER signals a special label value calledImplicit Null (Label 3)to its upstream neighbor (the penultimate router) during the signaling process (RSVP or LDP). When the penultimate routerreceives a packet destined for that egress LER, it sees the instruction to pop the transport label. Consequently, the penultimate router performs aPopoperation, stripping away the outer MPLS label and sending the raw IP packet (or the remaining inner service label) to the Egress LER.
This allows the Egress LER to perform only a single lookup. If the transport label was the only label, the Egress LER simply performs a standard IP lookup. If there is a VPN label remaining, it performs a single MPLS lookup for the VRF. This "default" behavior in Junos OS optimizes the performance of the egress router by offloading the final label removal to the penultimate hop. Note that ifUltimate Hop Popping (UHP) were configured (via the explicit-null command), the penultimate router would perform aSwapto Label 0 instead of a Pop.

NEW QUESTION # 36
By default, which routing table contains a list of all ingress LSPs?

• A. inet.0
• B. inet.1
• C. inet.2
• D. inet.3

Answer: D

Explanation:
In the Juniper Networks Junos operating system, the management of routing information is partitioned into several distinct routing tables (RIBs), each serving a specific architectural purpose. When dealing with Multiprotocol Label Switching (MPLS), understanding the distinction between inet.0 and inet.3 is fundamental for troubleshooting and traffic engineering.
Theinet.3routing table is specifically designed to store the egress IPv4 addresses ofLabel-Switched Paths (LSPs). When an ingress router successfully establishes an LSP (via RSVP or LDP), it places the host address of the egress router (the tail-end) into the inet.3 table. This table is not used for general packet forwarding; instead, it is primarily used by theBorder Gateway Protocol (BGP)for next-hop resolution. When BGP receives a route, it checks both inet.0 and inet.3 to resolve the next hop. If a matching entry exists in inet.3, the router knows it can reach that destination via an MPLS tunnel, allowing for the encapsulation of BGP traffic within MPLS.
In contrast,inet.0is the default unicast routing table used for standard IPv4 forwarding and contains routes learned via IGPs (OSPF, IS-IS) or static routing.inet.1is utilized for multicast forwarding (MBGP), andinet.2 is typically used for Multicast Source Discovery Protocol (MSDP) or RPF checks in multicast environments.
By isolating LSP egress points in inet.3, Junos prevents MPLS-specific paths from interfering with standard IGP path selection unless the administrator explicitly chooses to merge them (e.g., using the traffic- engineering bgp-igp command). Therefore, by default, the ingress router maintains its list of reachable LSP endpoints in inet.3.

NEW QUESTION # 37
The MPLS Label Information Base (LIB) is stored in which table?

• A. inet.0
• B. mpls.0
• C. inet6.0
• D. inet.3

Answer: B

Explanation:
In Junos OS, the Routing Engine maintains several different tables to manage various types of reachability and forwarding information. When a router is running MPLS, it must track both IP routes and label-to-label mappings.
Thempls.0table is the primary repository for theLabel Information Base (LIB)and theLabel Forwarding Information Base (LFIB). According to Juniper Networks documentation, mpls.0 is used by transit and egress routers to perform label lookups. When a labeled packet arrives at an interface, the router looks at the top label and references the mpls.0 table to determine the next action. This table stores the mapping of incoming labels to their corresponding operations:Pop(remove the label),Swap(replace the label), orPush(add an additional label).
It is crucial to understand the roles of the other tables to avoid confusion:
* inet.0 (Option D):This is the default unicast routing table for IPv4, used for standard IP-to-IP forwarding.
* inet.3 (Option C):This is theMPLS Path Table. It stores the egress loopback addresses of LSPs and is used by BGP for next-hop resolution to determine if a destination can be reached via an MPLS tunnel.
While inet.3 knowsaboutLSPs, the actual label-switching instructions reside in mpls.0.
* inet6.0 (Option A):This is the default unicast routing table for IPv6.
Therefore, for the specific purpose of storing the label base used for transit switching operations,mpls.0is the correct and only table used in the Junos architecture.

NEW QUESTION # 38
Exhibit:

Referring to the exhibit, why is the ge-0/0/0.0 interface shown as belonging to Level 3?

• A. This interface connects to a super spine.
• B. This interface is configured as a broadcast interface, that uses Level 3 as shorthand for both Level 1 and Level 2.
• C. This interface is configured as a point-to-point interface, that uses Level 3 as shorthand for both Level 1 and Level 2.
• D. This interface is configured as a broadcast interface that has three adjacencies with other routers on the shared LAN.

Answer: C

Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol as implemented in Junos OS, the output of operational commands uses specific numerical representations to denote the hierarchy levels of a neighbor adjacency. Understanding these values is crucial for troubleshooting peering relationships in a multi-level IS- IS network.
According to Juniper Networks technical documentation, the show isis adjacency command displays the status of the neighbors. The "L" column indicates the level of the adjacency:
* Level 1:Indicates the adjacency is strictly for intra-area routing.
* Level 2:Indicates the adjacency is strictly for backbone/inter-area routing.
* Level 3:This is ashorthand representationused by Junos to indicate that a single adjacency has been established forboth Level 1 and Level 2 simultaneously.
The critical distinction in this question lies in the interface type. On abroadcast interface(such as standard Ethernet), IS-IS typically establishes and maintains separate adjacencies for Level 1 and Level 2. In the CLI output for a broadcast link, you would generally see two separate lines for the same neighbor-one for Level
1 and one for Level 2.
However, on apoint-to-point (P2P)interface, IS-IS can negotiate both levels within a single adjacency. When this occurs, Junos consolidates the output into a single entry and usesLevel 3to signify that the adjacency is functional for both levels. Since the exhibit shows ge-0/0/0.0 as Level 3, it confirms that the link is configured with a point-to-point encapsulation (either natively or via the interface-type p2p command) and is acting as a Level 1/2 adjacency.
Option B is incorrect as the number "3" refers to protocol levels, not the count of neighbors. Option C is a reference to data center architectures that does not influence IS-IS level nomenclature. Option D is incorrect because, as noted, broadcast interfaces display these levels separately rather than using the Level 3 shorthand.

NEW QUESTION # 39
You are asked to configure a new network environment that will be based on IPv6 and use OSPF. In this scenario, which two statements correctly identify configuration task considerations? (Choose two.)

• A. The router ID used must be based on a 128-bit identifier value.
• B. The router ID used must be based on a 32-bit identifier value.
• C. Participating interfaces are only required to be configured with the IPv6 protocol family and address.
• D. Participating interfaces must be configured with both IPv4 and IPv6 protocol families and addresses.

Answer: B,C

Explanation:
When transitioning to an IPv6 environment usingOSPFv3(the version of OSPF designed for IPv6), there are significant architectural differences compared to OSPFv2 (IPv4). According to Juniper Networks technical documentation, OSPFv3 was redesigned to be more protocol-agnostic.
Router ID (Option C):
Despite OSPFv3 routing IPv6 (which uses 128-bit addresses), the OSPFRouter IDremains a32-bit value formatted like an IPv4 address (e.g., 1.1.1.1). This is a common point of confusion. In a pure IPv6 environment where no IPv4 addresses are configured on any interfaces, a Juniper router cannot automatically derive a Router ID. Therefore, the administrator must manually configure a 32-bit Router ID under [edit routing-options] for the OSPFv3 process to initialize.
Interface Configuration (Option D):
OSPFv3 runs directly over the IPv6 link-local scope. Unlike OSPFv2, it does not require an IPv4 address to function. Therefore, interfaces areonly required to be configured with family inet6(Option D). You do not need "dual-stack" (both IPv4 and IPv6) functionality just to run OSPFv3. The protocol uses the link-local address (fe80::/10) of the interface for neighbor adjacencies and as the next hop for routing updates. This separation allows OSPFv3 to carry multiple "address families" (both IPv4 and IPv6 unicast) if needed, but the base requirement for an IPv6-only network is simply the family inet6 configuration.

NEW QUESTION # 40
Which two statements are correct about TLVs in IS-IS? (Choose two.)

• A. LSPs can only contain one TLV.
• B. TLVs only support encoding IPv4 routing information.
• C. TLVs allow flexible encoding of routing information.
• D. LSPs can contain multiple TLVs.

Answer: C,D

Explanation:
In the IS-IS protocol,TLVs (Type, Length, Value)are the fundamental building blocks used to carry information withinLink-State PDUs (LSPs). Unlike some other protocols that have a fixed, rigid packet format, IS-IS was designed from the ground up to be modular and extensible. This extensibility is achieved through the use of TLVs, which allow the protocol to carry different types of data without requiring changes to the core protocol state machine.
According to Juniper Networks technical documentation,TLVs allow flexible encoding of routing information (Option C). Each TLV specifies the "Type" of information it carries (such as neighbor information or IP reachability), the "Length" of that information, and the "Value" (the actual data). This architecture is what allowed IS-IS to easily support IPv6 by simply adding new TLVs (like TLV 236 for IPv6 reachability) without redesigning the protocol. It also supports Traffic Engineering (TE) extensions used in MPLS environments by adding TLVs that describe link bandwidth and administrative groups.
Furthermore, a singleLSP can contain multiple TLVs (Option D). When a Juniper router generates an LSP, it packs all the necessary information-such as the router's area addresses, its neighbors, and its local interface prefixes-into various TLVs and places them into a single PDU. If the amount of information exceeds the Maximum Transmission Unit (MTU) of the interface, the router will generate additional LSPs (fragmented LSPs) to carry the remaining TLVs.
Options A and B are incorrect because restricting an LSP to a single TLV would make the protocol incredibly inefficient, and the very nature of IS-IS is its ability to support multiple network layer protocols (not just IPv4) through its agnostic TLV-based transport.

NEW QUESTION # 41
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE). You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state. In this scenario, which feature would accomplish this behavior?

• A. non-stop active bridging
• B. bidirectional forwarding detection
• C. graceful restart
• D. non-stop active routing

Answer: D

Explanation:
When designing High Availability (HA) for Juniper Service Provider routers, understanding the interaction between the control plane and data plane is vital. The user has already enabledGraceful Routing Engine Switchover (GRES), which synchronizes the interface and kernel state between the primary and backup Routing Engines (REs). However, GRES by itself does not preserve the routing protocol state (like OSPF adjacencies or BGP sessions).
To achieve the preservation of the routing protocol state without relying on external "helper" routers, you must implementNon-Stop Active Routing (NSR). According to Juniper Networks documentation, NSR uses the infrastructure provided by GRES to also synchronize the routing protocol process (rpd) information.
Under NSR, the backup RE maintains a "hot" standby state of all routing protocols. If the primary RE fails, the backup RE takes over immediately. Because it already possesses the full routing table and peer session states, the peering neighbors are unaware that a switchover occurred. No protocol adjacency resets occur, and traffic continues to flow uninterrupted.
It is crucial to differentiate NSR fromGraceful Restart (Option C). While Graceful Restart also aims to maintain traffic flow during a switchover, itdoesrequire help from neighboring routers (known as "helper mode"). If the neighbors do not support or are not configured for Graceful Restart, the sessions will drop.
Since the user explicitly stated they want to "avoid relying on helper routers," Graceful Restart is not the correct solution.
Non-stop Active Bridging (Option A)provides a similar "hitless" failover but specifically for Layer 2 environments (STP/VLANs) rather than Layer 3 routing protocols.BFD (Option B)is a failure detection protocol used to speed up convergence but does not preserve state during an RE failover; in fact, without NSR, BFD would likely trigger a faster teardown of the session during a switchover. Therefore,NSRis the only feature that meets the requirement for independent control-plane preservation.

NEW QUESTION # 42
You are configuring BGP on a Juniper router to peer with an external provider. After committing the configuration, the BGP session remains in the Idle state. Which configuration issue would prevent the BGP session from progressing beyond the Idle state?

• A. The peer is configured with a different router ID.
• B. The local AS number is higher than the peer's AS number.
• C. The BGP group type is set to internal instead of external.
• D. The peer IP address is unreachable.

Answer: D

Explanation:
In the BGP finite state machine, theIdlestate is the "stop" or "start" point of the protocol. When a session is stuck in Idle, it means the BGP process is either administratively disabled or, more commonly, is unable to initiate the underlying TCP connection required for BGP.
According to Juniper Networks Service Provider documentation, the most common reason for a BGP session to remain in Idle is a lack ofrouting reachability. For BGP to move to theConnectstate, the Junos kernel must have a route to the IP address specified in the neighbor statement. If thepeer IP address is unreachable (Option A)-meaning there is no route in inet.0 (via OSPF, IS-IS, or static)-the router cannot initiate the TCP three-way handshake on port 179. Consequently, the state machine will never progress.
Analysis of incorrect options:
* Option B:BGP does not care if the local AS is higher or lower than the peer's; it only cares if they match the configuration. AS numbers are identifiers, not priorities.
* Option C:A mismatchedRouter IDdoes not prevent a session from leaving the Idle state. It would typically cause the session to reach theOpenConfirmstate, and then fail with a "Notification" message due to a collision or identification error.
* Option D:While a mismatchedgroup type(internal vs. external) will cause the session to fail, it usually fails during theOpenmessage exchange (OpenSent state) because the AS numbers provided will not match the expected peer type (IBGP vs. EBGP).
Only the lack of a path to the neighbor (reachability) keeps the session at the very beginning of the process:
theIdlestate.

NEW QUESTION # 43
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