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Exam Code: JN0-364

Exam Name: Service Provider Routing and Switching, Specialist (JNCIS-SP)

Certification Provider: Juniper

Questions & Answers

Juniper JN0-364 Questions & Answers

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"Service Provider Routing and Switching, Specialist (JNCIS-SP) Exam", also known as JN0-364 exam, is a Juniper certification exam.

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Juniper JN0-364 Practice Test 32

Question 310

A fictional service-provider team at Kingfisher Wholesale is reviewing a multi-tenant service turn-up. The finding is: A backup link should be traversed explicitly during a maintenance test, yet the segment list lacks a link-specific adjacency instruction. Which observation would most directly establish that the reported failure has been repaired?

  1. The intended LSP is admitted on a path satisfying its bandwidth constraints without oversubscribing reserved resources.
  2. The LDP session establishes over reachable transport addresses and peers exchange expected label bindings.
  3. Packet traces follow the specified adjacency rather than merely the IGP shortest path to a node SID.
  4. BGP peers exchange the intended IPv6 NLRI and establish resolvable IPv6 next hops.

Explanation

Correct Answer

C:

Packet traces follow the specified adjacency rather than merely the IGP shortest path to a node SID. It tests the failed behavior itself rather than merely confirming that a configuration was committed. An adjacency SID steers traffic across a specific link, whereas a prefix SID steers toward a node or prefix along shortest paths. Applied here, the relevant facts are: A backup link should be traversed explicitly during a maintenance test, yet the segment list lacks a link-specific adjacency instruction. The question asks which observation would most directly establish that the reported failure has been repaired.

Incorrect Answers

A:

The intended LSP is admitted on a path satisfying its bandwidth constraints without oversubscribing reserved resources. That establishes RSVP path bandwidth admission rather than a repaired segment routing adjacency SID path. The reported failure still requires this evidence: packet traces follow the specified adjacency rather than merely the IGP shortest path to a node SID.

B:

The LDP session establishes over reachable transport addresses and peers exchange expected label bindings. It would validate a separate LDP transport address reachability operation, not the change needed here. Confirm instead that packet traces follow the specified adjacency rather than merely the IGP shortest path to a node SID.

D:

BGP peers exchange the intended IPv6 NLRI and establish resolvable IPv6 next hops. That establishes multiprotocol BGP IPv6 AFI rather than a repaired segment routing adjacency SID path. The reported failure still requires this evidence: packet traces follow the specified adjacency rather than merely the IGP shortest path to a node SID.

Question 311

The operations group at fictional Elmbridge Networks, working on a wholesale access handoff, finds: The IPv6 overlay route exists, yet encapsulated packets drop because the IPv4 underlay has no valid path to the tunnel destination. Which networking principle most accurately explains the observed failure?

  1. MP-BGP requires the appropriate address-family capability and route processing; an Established IPv4 BGP session alone does not carry IPv6 NLRI.
  2. An IPv6-over-IPv4 tunnel depends on the IPv4 underlay that transports encapsulated packets; overlay route presence cannot replace underlay connectivity.
  3. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.
  4. IS-IS can carry IPv6 topology and prefix information using appropriate TLVs; an IPv4 route table is not a substitute.

Explanation

Correct Answer

B:

An IPv6-over-IPv4 tunnel depends on the IPv4 underlay that transports encapsulated packets; overlay route presence cannot replace underlay connectivity. That is the specific distinction behind the observed outage. The targeted fix is to restore independent IPv4 underlay reachability to both tunnel endpoints and verify the IPv6 overlay path. Applied here, the relevant facts are: The IPv6 overlay route exists, yet encapsulated packets drop because the IPv4 underlay has no valid path to the tunnel destination. The question asks which networking principle most accurately explains the observed failure.

Incorrect Answers

A:

MP-BGP requires the appropriate address-family capability and route processing; an Established IPv4 BGP session alone does not carry IPv6 NLRI. Those conditions do not account for the specific IPv6 over IPv4 tunnel underlay problem reported by Elmbridge Networks.

C:

Although BGP next-hop reachability needs this consideration, the failure at issue has a different cause. An IPv6-over-IPv4 tunnel depends on the IPv4 underlay that transports encapsulated packets; overlay route presence cannot replace underlay connectivity.

D:

Although IS-IS IPv6 topology TLVs needs this consideration, the failure at issue has a different cause. An IPv6-over-IPv4 tunnel depends on the IPv4 underlay that transports encapsulated packets; overlay route presence cannot replace underlay connectivity.

Question 312

At fictional Orchard City Transit, during a virtual-router integration, engineers report: After introducing a new service loopback, OSPF peers remain Full yet the loopback never appears as an external route because export is not configured. Which networking principle most accurately explains the observed failure?

  1. LOCAL_PREF is an intradomain BGP path attribute that normally influences preferred outbound exit for routes inside the AS.
  2. OSPF external redistribution is controlled by export policy; stable IGP neighbor state does not imply arbitrary static or direct routes are advertised.
  3. OSPF area identity is part of neighbor compatibility, and mismatched area membership prevents formation of the intended adjacency.
  4. OSPF neighbor formation requires compatible hello and dead timers; link-layer carrier does not override timer mismatch.

Explanation

Correct Answer

B:

OSPF external redistribution is controlled by export policy; stable IGP neighbor state does not imply arbitrary static or direct routes are advertised. That is the specific distinction behind the observed outage. The targeted fix is to apply a scoped OSPF export policy to originate only the approved active source prefix and confirm the receiving routers learn it. Applied here, the relevant facts are: After introducing a new service loopback, OSPF peers remain Full yet the loopback never appears as an external route because export is not configured. The question asks which networking principle most accurately explains the observed failure.

Incorrect Answers

A:

This principle matters when troubleshooting BGP local preference, but using it here mistakes a different failure mode for OSPF external route export. The relevant distinction is: OSPF external redistribution is controlled by export policy; stable IGP neighbor state does not imply arbitrary static or direct routes are advertised.

C:

OSPF area identity is part of neighbor compatibility, and mismatched area membership prevents formation of the intended adjacency. Those conditions do not account for the specific OSPF external route export problem reported by Orchard City Transit.

D:

OSPF neighbor formation requires compatible hello and dead timers; link-layer carrier does not override timer mismatch. Those conditions do not account for the specific OSPF external route export problem reported by Orchard City Transit.

Question 313

During a regional backbone upgrade at fictional Bluehaven Mobile, the team observes: After a transient LAN outage, peers disagree on LSP sequence numbers and one router temporarily lacks the new topology. Which observation would most directly establish that the reported failure has been repaired?

  1. The shared LAN shows the intended DIS and pseudonode information, and adjacency remains stable through a controlled election.
  2. All participating nodes interpret intended link metrics consistently and select the expected least-cost paths.
  3. The two peers converge to consistent current LSP sequence information and compute the same intended topology reachability.
  4. Comparably eligible paths carry intended MEDs and route selection in the agreed test case follows the planned preference.

Explanation

Correct Answer

C:

The two peers converge to consistent current LSP sequence information and compute the same intended topology reachability. It tests the failed behavior itself rather than merely confirming that a configuration was committed. IS-IS LSP sequencing and sequence-number PDUs keep link-state databases synchronized; adjacency status alone does not ensure database parity. Applied here, the relevant facts are: After a transient LAN outage, peers disagree on LSP sequence numbers and one router temporarily lacks the new topology. The question asks which observation would most directly establish that the reported failure has been repaired.

Incorrect Answers

A:

The shared LAN shows the intended DIS and pseudonode information, and adjacency remains stable through a controlled election. It would validate a separate IS-IS LAN designated intermediate system operation, not the change needed here. Confirm instead that the two peers converge to consistent current LSP sequence information and compute the same intended topology reachability.

B:

This measurement tests IS-IS wide metrics; it cannot distinguish success from failure for the observed IS-IS LSP database synchronization condition. IS-IS LSP sequencing and sequence-number PDUs keep link-state databases synchronized; adjacency status alone does not ensure database parity.

D:

The check is meaningful for BGP MED neighbor consideration, but it does not prove that IS-IS LSP database synchronization was repaired. IS-IS LSP sequencing and sequence-number PDUs keep link-state databases synchronized; adjacency status alone does not ensure database parity.

Question 314

A fictional service-provider team at Lighthouse Education is reviewing a virtual-router integration. The finding is: An IGP route remains active for too long after a one-way transport fault because loss detection relies on slow routing hello timers. Which ongoing control would most directly detect or prevent the same failure from recurring?

  1. Check negotiated restart capabilities, grace timers, and stale-route expiration in resilience drills.
  2. Test forwarding, bridge MAC state, and protocol-neighbor continuity separately during redundant Routing Engine failover drills.
  3. Validate supported metric style, actual LSP metric values, and computed paths during topology expansion.
  4. Test BFD session negotiation and routing reaction times during controlled failures.

Explanation

Correct Answer

D:

Test BFD session negotiation and routing reaction times during controlled failures. This monitors the behavior that failed at Lighthouse Education; the most useful acceptance signal is that A controlled link or peer failure causes BFD Down and timely routing reconvergence rather than waiting for long protocol timers.

Incorrect Answers

A:

The control protects graceful restart peer assistance. It does not establish the ongoing BFD fast failure detection behavior required in this network. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

B:

The control protects GRES preserves forwarding not protocols. It does not establish the ongoing BFD fast failure detection behavior required in this network. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

C:

The control protects IS-IS wide metrics. It does not establish the ongoing BFD fast failure detection behavior required in this network. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

Question 315

The operations group at fictional Eastlake Services, working on a multi-tenant service turn-up, finds: A new region is missing reflected route reachability because the route reflector does not classify intended clients correctly. Which focused engineering action would best correct the fault?

  1. Set and test a coherent MED policy between comparable paths, acknowledging peer AS comparison behavior and upstream policies.
  2. Correct the specific BGP import or export policy at the peer or group, matching approved prefix and path criteria.
  3. Correct the route-reflector client topology and validate reflected path distribution without introducing loops.
  4. Tune the intended OSPF interface costs and verify SPF-selected reachability for the affected destinations.

Explanation

Correct Answer

C:

Correct the route-reflector client topology and validate reflected path distribution without introducing loops. This treats the fault shown by Eastlake Services: ordinary iBGP does not readvertise iBGP-learned routes to another iBGP peer; route reflectors provide a controlled exception. Confirm success when authorized clients receive the expected reflected iBGP paths and preserve appropriate originator or cluster-loop protection.

Incorrect Answers

A:

Set and test a coherent MED policy between comparable paths, acknowledging peer AS comparison behavior and upstream policies. Its normal acceptance signal would be comparably eligible paths carry intended MEDs and route selection in the agreed test case follows the planned preference. Here the deciding check is different: authorized clients receive the expected reflected iBGP paths and preserve appropriate originator or cluster-loop protection.

B:

Correct the specific BGP import or export policy at the peer or group, matching approved prefix and path criteria. Its normal acceptance signal would be only approved prefixes are advertised to or accepted from the intended neighbor, as confirmed by received and advertised route views. Here the deciding check is different: authorized clients receive the expected reflected iBGP paths and preserve appropriate originator or cluster-loop protection.

D:

Tune the intended OSPF interface costs and verify SPF-selected reachability for the affected destinations. Its normal acceptance signal would be the best route's cumulative OSPF cost selects the approved path and changes predictably when the alternative fails. Here the deciding check is different: authorized clients receive the expected reflected iBGP paths and preserve appropriate originator or cluster-loop protection.

Question 316

At fictional Moorland Carriers, during a virtual-router integration, engineers report: A subset of source traffic should traverse a security inspection RIB, but the global destination route sends it through the ordinary transit exit. Which networking principle most accurately explains the observed failure?

  1. A RIB group can install selected routes into additional routing tables; it does not merge isolated forwarding domains indiscriminately.
  2. An aggregate route is conditional on active contributing routes and normally uses a discard or reject next hop to avoid creating a forwarding loop.
  3. Filter-based forwarding selects a routing lookup table using packet classification; it does not rewrite the global best route for every packet.
  4. OSPF database description negotiation can reject incompatible interface MTUs even after hello packets establish initial communication.

Explanation

Correct Answer

C:

Filter-based forwarding selects a routing lookup table using packet classification; it does not rewrite the global best route for every packet. That is the specific distinction behind the observed outage. The targeted fix is to apply a narrowly scoped ingress filter-based-forwarding match that selects the intended forwarding routing instance and validate lookup there.

Incorrect Answers

A:

A RIB group can install selected routes into additional routing tables; it does not merge isolated forwarding domains indiscriminately. That describes RIB group route sharing, whereas the observed symptoms are caused by filter-based forwarding table selection; it does not predict the reported behavior.

B:

This principle matters when troubleshooting aggregate route contributor, but using it here mistakes a different failure mode for filter-based forwarding table selection. The relevant distinction is: filter-based forwarding selects a routing lookup table using packet classification; it does not rewrite the global best route for every packet.

D:

OSPF database description negotiation can reject incompatible interface MTUs even after hello packets establish initial communication. That describes OSPF MTU negotiation, whereas the observed symptoms are caused by filter-based forwarding table selection; it does not predict the reported behavior.

Question 317

During a carrier peering cutover at fictional Unionpoint Mobile, the team observes: A wholesale access edge must carry an inner customer VLAN through the network but its outer service tag is inconsistent at handoff. Which networking principle most accurately explains the observed failure?

  1. Ethernet bridges learn destination forwarding from observed source MAC addresses; unstable topology can continually invalidate learned ports.
  2. MSTP region identity depends on consistent name, revision, and VLAN mapping; mismatches create region boundaries.
  3. IRB provides an L3 interface for a Layer 2 VLAN bridge domain; MAC learning alone cannot perform inter-subnet routing.
  4. Q-in-Q carries an additional provider VLAN tag around customer-tagged traffic to isolate services with overlapping customer VLAN numbers.

Explanation

Correct Answer

D:

Q-in-Q carries an additional provider VLAN tag around customer-tagged traffic to isolate services with overlapping customer VLAN numbers. That is the specific distinction behind the observed outage. The targeted fix is to configure the appropriate provider bridge service tag and preserve customer inner tags across the carrier handoff. Applied here, the relevant facts are: A wholesale access edge must carry an inner customer VLAN through the network but its outer service tag is inconsistent at handoff. The question asks which networking principle most accurately explains the observed failure.

Incorrect Answers

A:

Ethernet bridges learn destination forwarding from observed source MAC addresses; unstable topology can continually invalidate learned ports. That describes MAC address learning and moves, whereas the observed symptoms are caused by provider Q-in-Q tagging; it does not predict the reported behavior.

B:

MSTP region identity depends on consistent name, revision, and VLAN mapping; mismatches create region boundaries. Those conditions do not account for the specific provider Q-in-Q tagging problem reported by Unionpoint Mobile.

C:

Although integrated routing and bridging needs this consideration, the failure at issue has a different cause. Q-in-Q carries an additional provider VLAN tag around customer-tagged traffic to isolate services with overlapping customer VLAN numbers. Applied here, the relevant facts are: A wholesale access edge must carry an inner customer VLAN through the network but its outer service tag is inconsistent at handoff. The question asks which networking principle most accurately explains the observed failure.

Question 318

A fictional service-provider team at Juniper Glen Telecom is reviewing a dual-stack transit pilot. The finding is: Two routers form an IS-IS adjacency but IPv6 destinations are missing because the required address-family reachability information is not advertised. Which ongoing control would most directly detect or prevent the same failure from recurring?

  1. Capture DIS election and pseudonode observations during shared LAN commissioning and role changes.
  2. Include tagged and untagged frame tests in trunk turn-up and template drift checks.
  3. Compare advertised TLVs and learned route counts before and after IS-IS feature upgrades.
  4. Compare LSDB consistency and stale LSP age on critical adjacencies after link flaps.

Explanation

Correct Answer

C:

Compare advertised TLVs and learned route counts before and after IS-IS feature upgrades. This monitors the behavior that failed at Juniper Glen Telecom; the most useful acceptance signal is that link-state PDUs include the intended reachability TLVs and the matching routes populate peer routing tables.

Incorrect Answers

A:

The control protects IS-IS LAN designated intermediate system. It does not establish the ongoing IS-IS TLV reachability behavior required in this network. IS-IS uses TLVs inside its PDUs to encode prefix and protocol capabilities; adjacency alone is not proof of expected reachability advertisements.

B:

Include tagged and untagged frame tests in trunk turn-up and template drift checks. The monitored boundary differs from IS-IS TLV reachability, so the original weakness might reappear unnoticed. IS-IS uses TLVs inside its PDUs to encode prefix and protocol capabilities; adjacency alone is not proof of expected reachability advertisements.

D:

Compare LSDB consistency and stale LSP age on critical adjacencies after link flaps. That ongoing check is for IS-IS LSP database synchronization; it would not reliably detect recurrence of IS-IS TLV reachability. IS-IS uses TLVs inside its PDUs to encode prefix and protocol capabilities; adjacency alone is not proof of expected reachability advertisements.

Question 319

The operations group at fictional Northshore Digital, working on a multi-tenant service turn-up, finds: An iBGP route is received with valid attributes but is inactive because its next hop is not resolvable in the routing table. Which observation would most directly establish that the reported failure has been repaired?

  1. The received BGP route has a resolvable next hop, becomes eligible, and installs usable forwarding state.
  2. Comparably eligible paths carry intended MEDs and route selection in the agreed test case follows the planned preference.
  3. The broadcast segment has the planned DR and BDR and expected adjacency states after a controlled election event.
  4. The intended multi-hop peer establishes while IP reachability and any required loopback-source configuration are correct.

Explanation

Correct Answer

A:

The received BGP route has a resolvable next hop, becomes eligible, and installs usable forwarding state. It tests the failed behavior itself rather than merely confirming that a configuration was committed. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation. Applied here, the relevant facts are: An iBGP route is received with valid attributes but is inactive because its next hop is not resolvable in the routing table. The question asks which observation would most directly establish that the reported failure has been repaired.

Incorrect Answers

B:

The check is meaningful for BGP MED neighbor consideration, but it does not prove that BGP next-hop reachability was repaired. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

C:

This measurement tests OSPF designated router election; it cannot distinguish success from failure for the observed BGP next-hop reachability condition. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

D:

This measurement tests EBGP multihop reachability; it cannot distinguish success from failure for the observed BGP next-hop reachability condition. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

Question 320

At fictional Bluehaven Mobile, during an intercity fiber refresh, engineers report: A service provider moves a tunnel peer and forgets to update underlay routing to its GRE destination, leaving encapsulation blackholed. Which networking principle most accurately explains the observed failure?

  1. GRE encapsulates packets between outer IP endpoints; the underlay must route the outer destination before inner traffic can succeed.
  2. GRE adds header bytes, reducing effective payload MTU across an unchanged underlay path.
  3. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.
  4. GRE provides encapsulation and protocol carriage but does not inherently supply confidentiality or cryptographic integrity.

Explanation

Correct Answer

A:

GRE encapsulates packets between outer IP endpoints; the underlay must route the outer destination before inner traffic can succeed. That is the specific distinction behind the observed outage. The targeted fix is to restore underlay IP reachability between GRE tunnel endpoints and validate encapsulated probe traffic.

Incorrect Answers

B:

This principle matters when troubleshooting GRE tunnel path MTU, but using it here mistakes a different failure mode for GRE endpoint underlay routing. The relevant distinction is: GRE encapsulates packets between outer IP endpoints; the underlay must route the outer destination before inner traffic can succeed.

C:

A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation. That describes BGP next-hop reachability, whereas the observed symptoms are caused by GRE endpoint underlay routing; it does not predict the reported behavior.

D:

GRE provides encapsulation and protocol carriage but does not inherently supply confidentiality or cryptographic integrity. Those conditions do not account for the specific GRE endpoint underlay routing problem reported by Bluehaven Mobile.

Service Provider Routing and Switching, Specialist (JNCIS-SP) (JN0-364) Practice Tests