Juniper JN0-364 Questions & Answers

Enable and inspect the relevant IS-IS IPv6 address-family reachability advertisements and verify eligible routes. Its normal acceptance signal would be IPv6 reachability TLVs are exchanged and peers install the intended IPv6 routes independently of IPv4 reachability. Here the deciding check is different: the impacted non-designated port stays protected while BPDUs are absent and returns only after control-plane health is restored.

Apply root protection on boundary designated ports where upstream superiority must be blocked and verify root placement. That could help in a case involving RSTP root protection. This failure instead depends on RSTP loop protection; loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

Align MST region name, revision, and VLAN-to-instance mapping across all intended region members. This addresses MSTP region consistency, but the reported symptoms arise from RSTP loop protection. For this case, verify instead that the impacted non-designated port stays protected while BPDUs are absent and returns only after control-plane health is restored.

The proposal changes VSTP per-VLAN root choice; that is not the failure isolated by the facts. It could leave RSTP edge BPDU protection unresolved even if its own test passed. Edge BPDU protection is intended for ports expected to connect to hosts, not for ordinary switch-to-switch links that exchange BPDUs.

The proposal changes RSTP root protection; that is not the failure isolated by the facts. It could leave RSTP edge BPDU protection unresolved even if its own test passed. Edge BPDU protection is intended for ports expected to connect to hosts, not for ordinary switch-to-switch links that exchange BPDUs.

The proposal changes integrated routing and bridging; that is not the failure isolated by the facts. It could leave RSTP edge BPDU protection unresolved even if its own test passed. Edge BPDU protection is intended for ports expected to connect to hosts, not for ordinary switch-to-switch links that exchange BPDUs.

Audit network type against actual link topology during edge circuit deployment. That ongoing check is for OSPF point-to-point topology; it would not reliably detect recurrence of OSPF MTU negotiation. OSPF database description negotiation can reject incompatible interface MTUs even after hello packets establish initial communication.

Alert on tunnel outer-endpoint reachability failures independently of inner route health. The monitored boundary differs from OSPF MTU negotiation, so the original weakness might reappear unnoticed. OSPF database description negotiation can reject incompatible interface MTUs even after hello packets establish initial communication.

This is a useful guard against OSPF hello and dead timers, but it is not scoped to the observed OSPF MTU negotiation failure. An appropriate test would show that the two peers progress through database synchronization to Full and agree on reachable link-state information.

Graceful restart depends on protocol restart and helper behavior; it is not identical to copying live routing protocol state to a backup Routing Engine. Those conditions do not account for the specific LACP aggregation consistency problem reported by Coastline Carrier.

This principle matters when troubleshooting IPv6 static next-hop scope, but using it here mistakes a different failure mode for LACP aggregation consistency. The relevant distinction is: LACP aggregates only compatible negotiated member links; physical Up state alone does not prove active bundle participation.

Although GRES preserves forwarding not protocols needs this consideration, the failure at issue has a different cause. LACP aggregates only compatible negotiated member links; physical Up state alone does not prove active bundle participation.

The prefix SID is advertised and all ingress routers compute consistent transport label behavior for the node destination. That establishes segment routing prefix SID rather than a repaired RSTP alternate port reconvergence path. The reported failure still requires this evidence: the alternate port assumes an appropriate forwarding role on failure without allowing simultaneous Layer 2 loops.

The check is meaningful for RSTP root protection, but it does not prove that RSTP alternate port reconvergence was repaired. RSTP port roles and rapid state transitions support fast loop-free reconvergence, unlike simply forcing all redundant ports forwarding.

Adjacent devices report matching MST region configuration and VLANs map to the same intended instances. That establishes MSTP region consistency rather than a repaired RSTP alternate port reconvergence path. The reported failure still requires this evidence: the alternate port assumes an appropriate forwarding role on failure without allowing simultaneous Layer 2 loops.

This measurement tests provider bridging MTU overhead; it cannot distinguish success from failure for the observed flexible VLAN encapsulation alignment condition. Junos interface VLAN tagging mode and logical-unit encapsulation must match received frame format for successful delivery.

Hosts receive the intended untagged frames and trunk links carry the specified VLAN tags with correct membership. It would validate a separate VLAN access trunk distinction operation, not the change needed here. Confirm instead that the correct single- and double-tagged service units receive traffic matching their configured VLAN identifiers.

The check is meaningful for IBGP route reflection, but it does not prove that flexible VLAN encapsulation alignment was repaired. Junos interface VLAN tagging mode and logical-unit encapsulation must match received frame format for successful delivery.

Restore IP reachability to the negotiated LDP transport addresses and verify the TCP session and label exchange. Its normal acceptance signal would be the LDP session establishes over reachable transport addresses and peers exchange expected label bindings. Here the deciding check is different: incoming labels resolve to valid outgoing label operations and interfaces, and data-plane counters show successful forwarding.

The proposal changes MPLS label push swap pop; that is not the failure isolated by the facts. It could leave MPLS label forwarding table mismatch unresolved even if its own test passed. Control-plane LSP state and data-plane label forwarding entries are separate checks; an Up session does not prove the FIB is correct.

The proposal changes OSPF area identity mismatch; that is not the failure isolated by the facts. It could leave MPLS label forwarding table mismatch unresolved even if its own test passed. Control-plane LSP state and data-plane label forwarding entries are separate checks; an Up session does not prove the FIB is correct.

The MPLS S bit identifies the final label in a stack; it does not describe label priority or path preference. That describes MPLS label stack bottom bit, whereas the observed symptoms are caused by LDP transport address reachability; it does not predict the reported behavior.

This principle matters when troubleshooting IS-IS NET and system ID, but using it here mistakes a different failure mode for LDP transport address reachability. The relevant distinction is: LDP discovery and session setup are distinct; a transport TCP connection must be reachable after hello discovery.

Penultimate-hop popping can remove an outer transport label before the egress, reducing egress label processing. Those conditions do not account for the specific LDP transport address reachability problem reported by Valleycrest Internet.

The control protects IS-IS route redistribution policy. It does not establish the ongoing IS-IS L1 and L2 reachability behavior required in this network. IS-IS uses Level 1 within an area and Level 2 between areas; an L1 router needs an appropriate inter-area exit or route leak.

Compare instance membership, VLAN mappings, and MAC tables for cross-tenant isolation at each deployment. That ongoing check is for virtual-switch instance isolation; it would not reliably detect recurrence of IS-IS L1 and L2 reachability. IS-IS uses Level 1 within an area and Level 2 between areas; an L1 router needs an appropriate inter-area exit or route leak.

Compare advertised TLVs and learned route counts before and after IS-IS feature upgrades. The monitored boundary differs from IS-IS L1 and L2 reachability, so the original weakness might reappear unnoticed. IS-IS uses Level 1 within an area and Level 2 between areas; an L1 router needs an appropriate inter-area exit or route leak.

RSVP-TE establishes LSP state through forward PATH and reverse RESV processing; one-way PATH reception is insufficient. That describes RSVP PATH and RESV signaling, whereas the observed symptoms are caused by MPLS label push swap pop; it does not predict the reported behavior.

Although segment routing prefix SID needs this consideration, the failure at issue has a different cause. MPLS forwards using labels: ingress commonly pushes labels, intermediate LSRs swap them, and the egress removes the remaining label.

LACP aggregates only compatible negotiated member links; physical Up state alone does not prove active bundle participation. Those conditions do not account for the specific MPLS label push swap pop problem reported by Eastlake Services.