Juniper JN0-364 Questions & Answers

Allow the required scoped ICMPv6 neighbor discovery exchanges and confirm neighbor cache resolution. This addresses IPv6 neighbor discovery filtering, but the reported symptoms arise from IPv6 over IPv4 tunnel underlay. For this case, verify instead that both IPv4 endpoint paths are reachable and IPv6 packets traverse the encapsulated link end to end.

Specify a reachable IPv6 next hop with correct interface scope where required and verify IPv6 route installation. Its normal acceptance signal would be the intended IPv6 destination has an active route with a resolved next hop and working egress interface. Here the deciding check is different: both IPv4 endpoint paths are reachable and IPv6 packets traverse the encapsulated link end to end.

Add an approved encryption layer such as IPsec when confidentiality is required, while retaining GRE only if needed for routing encapsulation. That could help in a case involving GRE confidentiality limitation. This failure instead depends on IPv6 over IPv4 tunnel underlay; an IPv6-over-IPv4 tunnel depends on the IPv4 underlay that transports encapsulated packets; overlay route presence cannot replace underlay connectivity.

The intended multi-hop peer establishes while IP reachability and any required loopback-source configuration are correct. It would validate a separate EBGP multihop reachability operation, not the change needed here. Confirm instead that the receiving area's LSDB and route table show intended inter-area reachability without copying the source area's full topology.

This measurement tests OSPF designated router election; it cannot distinguish success from failure for the observed OSPF area LSA propagation condition. OSPF limits most intra-area LSAs to their areas while ABRs advertise inter-area route information using summary LSAs.

This measurement tests OSPF hello and dead timers; it cannot distinguish success from failure for the observed OSPF area LSA propagation condition. OSPF limits most intra-area LSAs to their areas while ABRs advertise inter-area route information using summary LSAs. Applied here, the relevant facts are: An operator expects intra-area router LSAs to flood directly through an ABR into a different area rather than seeing summary information. The question asks which observation would most directly establish that the reported failure has been repaired.

The proposal changes IS-IS LAN designated intermediate system; that is not the failure isolated by the facts. It could leave IS-IS route redistribution policy unresolved even if its own test passed. IS-IS exports externally originated routes through routing policy; forming an adjacency does not redistribute every route automatically.

The proposal changes IS-IS LSP database synchronization; that is not the failure isolated by the facts. It could leave IS-IS route redistribution policy unresolved even if its own test passed. IS-IS exports externally originated routes through routing policy; forming an adjacency does not redistribute every route automatically.

Apply root protection on boundary designated ports where upstream superiority must be blocked and verify root placement. This addresses RSTP root protection, but the reported symptoms arise from IS-IS route redistribution policy. For this case, verify instead that the intended service route is advertised while nonapproved connected and static prefixes remain outside the IS-IS domain.

Audit network type against actual link topology during edge circuit deployment. The monitored boundary differs from VLAN access trunk distinction, so the original weakness might reappear unnoticed. Access ports and trunk ports have different VLAN tagging and membership behaviors; link-up state does not make the modes equivalent.

Validate VLAN-to-IRB bindings, gateway ARP or neighbor entries, and allowed cross-VLAN flows after provisioning. The monitored boundary differs from VLAN access trunk distinction, so the original weakness might reappear unnoticed. Access ports and trunk ports have different VLAN tagging and membership behaviors; link-up state does not make the modes equivalent.

Compare instance membership, VLAN mappings, and MAC tables for cross-tenant isolation at each deployment. The monitored boundary differs from VLAN access trunk distinction, so the original weakness might reappear unnoticed. Access ports and trunk ports have different VLAN tagging and membership behaviors; link-up state does not make the modes equivalent.

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 AS-path prepend inbound influence; it does not predict the reported behavior.

This principle matters when troubleshooting IBGP route reflection, but using it here mistakes a different failure mode for AS-path prepend inbound influence. The relevant distinction is: AS-path prepending can make a path less attractive to other ASes but does not override their local policies or guarantee inbound steering. Applied here, the relevant facts are: A customer tries to influence remote inbound selection by changing LOCAL_PREF only inside its own AS, with no change to external advertisements. The question asks which networking principle most accurately explains the observed failure.

Although IS-IS wide metrics needs this consideration, the failure at issue has a different cause. AS-path prepending can make a path less attractive to other ASes but does not override their local policies or guarantee inbound steering.

The control protects OSPF interface metric selection. It does not establish the ongoing OSPF area identity mismatch behavior required in this network. OSPF area identity is part of neighbor compatibility, and mismatched area membership prevents formation of the intended adjacency.

This is a useful guard against OSPF point-to-point topology, but it is not scoped to the observed OSPF area identity mismatch failure. An appropriate test would show that the pair establishes the expected OSPF adjacency with matching area assignment and reachable learned prefixes.

This is a useful guard against routing instance separation, but it is not scoped to the observed OSPF area identity mismatch failure. An appropriate test would show that the pair establishes the expected OSPF adjacency with matching area assignment and reachable learned prefixes.

Alert on missing LDP label mappings for required FECs after peer resets and topology changes. That ongoing check is for LDP label binding completeness; it would not reliably detect recurrence of MPLS label push swap pop. MPLS forwards using labels: ingress commonly pushes labels, intermediate LSRs swap them, and the egress removes the remaining label.

Test forwarding, bridge MAC state, and protocol-neighbor continuity separately during redundant Routing Engine failover drills. The monitored boundary differs from MPLS label push swap pop, so the original weakness might reappear unnoticed. MPLS forwards using labels: ingress commonly pushes labels, intermediate LSRs swap them, and the egress removes the remaining label.

Validate node-SID uniqueness, advertised SRGB ranges and effective label forwarding after upgrades. The monitored boundary differs from MPLS label push swap pop, so the original weakness might reappear unnoticed. MPLS forwards using labels: ingress commonly pushes labels, intermediate LSRs swap them, and the egress removes the remaining label.

The control protects OSPF area LSA propagation. It does not establish the ongoing RSTP root protection behavior required in this network. Root protection blocks acceptance of an unexpected superior root across designated boundary ports; it is not the same as BPDU edge protection.

Test one-way BPDU loss and confirm correct port role and loop-protection state during maintenance. That ongoing check is for RSTP loop protection; it would not reliably detect recurrence of RSTP root protection. Root protection blocks acceptance of an unexpected superior root across designated boundary ports; it is not the same as BPDU edge protection. Applied here, the relevant facts are: After a new access layer is attached, the planned root bridge loses root position because an untrusted designated-port neighbor has better bridge priority. The question asks which ongoing control would most directly detect or prevent the same failure from recurring.

Validate MST digest and instance mapping consistency as part of configuration review. That ongoing check is for MSTP region consistency; it would not reliably detect recurrence of RSTP root protection. Root protection blocks acceptance of an unexpected superior root across designated boundary ports; it is not the same as BPDU edge protection.

Although IS-IS IPv6 topology TLVs needs this consideration, the failure at issue has a different cause. IS-IS metric encoding must support the configured value range; mixed or incompatible styles can alter SPF interpretation.

IS-IS exports externally originated routes through routing policy; forming an adjacency does not redistribute every route automatically. Those conditions do not account for the specific IS-IS wide metrics problem reported by Hawthorne Metro.

IS-IS LSP sequencing and sequence-number PDUs keep link-state databases synchronized; adjacency status alone does not ensure database parity. That describes IS-IS LSP database synchronization, whereas the observed symptoms are caused by IS-IS wide metrics; it does not predict the reported behavior.

Correct the locally expected peer AS and actual neighbor AS identity and validate the BGP OPEN exchange. This addresses BGP ASN and OPEN negotiation, but the reported symptoms arise from VLAN access trunk distinction. For this case, verify instead that hosts receive the intended untagged frames and trunk links carry the specified VLAN tags with correct membership.

Align the explicitly approved native and untagged VLAN behavior at both ends and verify tagged versus untagged traffic. That could help in a case involving native untagged VLAN drift. This failure instead depends on VLAN access trunk distinction; access ports and trunk ports have different VLAN tagging and membership behaviors; link-up state does not make the modes equivalent.

The proposal changes integrated routing and bridging; that is not the failure isolated by the facts. It could leave VLAN access trunk distinction unresolved even if its own test passed. Access ports and trunk ports have different VLAN tagging and membership behaviors; link-up state does not make the modes equivalent.

OSPF limits most intra-area LSAs to their areas while ABRs advertise inter-area route information using summary LSAs. Those conditions do not account for the specific OSPF hello and dead timers problem reported by Brookstone Communications.

This principle matters when troubleshooting LDP label binding completeness, but using it here mistakes a different failure mode for OSPF hello and dead timers. The relevant distinction is: OSPF neighbor formation requires compatible hello and dead timers; link-layer carrier does not override timer mismatch.

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 OSPF hello and dead timers; it does not predict the reported behavior.