Juniper JN0-364 Questions & Answers

The check is meaningful for OSPF MTU negotiation, 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.

The impacted non-designated port stays protected while BPDUs are absent and returns only after control-plane health is restored. That establishes RSTP loop protection 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.

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. Applied here, the relevant facts are: A shared access segment has unexpected forwarding behavior after root failure because alternate and designated roles were not identified. The question asks which observation would most directly establish that the reported failure has been repaired.

Compare advertised TLVs and learned route counts before and after IS-IS feature upgrades. The monitored boundary differs from IPv6 static next-hop scope, so the original weakness might reappear unnoticed. IPv6 link-local next hops are interface-scoped; a bare link-local address can be insufficient to identify the outgoing link.

Monitor tunnel endpoint reachability and overlay IPv6 loss as separate service checks. That ongoing check is for IPv6 over IPv4 tunnel underlay; it would not reliably detect recurrence of IPv6 static next-hop scope. IPv6 link-local next hops are interface-scoped; a bare link-local address can be insufficient to identify the outgoing link.

Check IPv6 OSPFv3 adjacencies and learned prefixes separately from IPv4 OSPFv2 health. That ongoing check is for OSPFv3 IPv6 neighbor reachability; it would not reliably detect recurrence of IPv6 static next-hop scope. IPv6 link-local next hops are interface-scoped; a bare link-local address can be insufficient to identify the outgoing link.

Audit L1/L2 levels, attached-bit behavior, and approved route leaks after backbone changes. 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.

Maintain an authoritative router-ID inventory and block duplicate assignments in provisioning checks. That ongoing check is for stable OSPF router identifier; 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.

Capture DIS election and pseudonode observations during shared LAN commissioning and role changes. That ongoing check is for IS-IS LAN designated intermediate system; 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.

Audit route-reflector client assignments and reflected prefix visibility during iBGP topology changes. That ongoing check is for IBGP route reflection; it would not reliably detect recurrence of EBGP multihop reachability. EBGP sessions to nonadjacent neighbors need suitable multihop TTL and transport reachability; routing reachability alone can be insufficient.

Validate local-AS and peer-AS inventory against change requests before activating external sessions. That ongoing check is for BGP ASN and OPEN negotiation; it would not reliably detect recurrence of EBGP multihop reachability. EBGP sessions to nonadjacent neighbors need suitable multihop TTL and transport reachability; routing reachability alone can be insufficient.

This is a useful guard against IS-IS LAN designated intermediate system, but it is not scoped to the observed EBGP multihop reachability failure. An appropriate test would show that the intended multi-hop peer establishes while IP reachability and any required loopback-source configuration are correct.

The proposal changes OSPF hello and dead timers; that is not the failure isolated by the facts. It could leave RSTP loop protection unresolved even if its own test passed. Loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

Enable the supported BPDU protection behavior on designated edge ports so unexpected BPDUs trigger a controlled protective response. Its normal acceptance signal would be an unexpected BPDU causes the intended protective state and operations receive a traceable port event. 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.

Review RSTP roles and convergence expectations and ensure the valid alternate path can transition safely when the root path fails. That could help in a case involving RSTP alternate port reconvergence. This failure instead depends on RSTP loop protection; loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

Verify LAN circuit type, DIS election priorities, and pseudonode LSP origin under the planned shared-segment design. This addresses IS-IS LAN designated intermediate system, but the reported symptoms arise from IS-IS NET and system ID. For this case, verify instead that neighbor state and system IDs show unique routers, and Level 1 adjacency establishes only among compatible area peers.

The proposal changes IS-IS L1 and L2 reachability; that is not the failure isolated by the facts. It could leave IS-IS NET and system ID unresolved even if its own test passed. The IS-IS NET encodes area membership and system identity, which must be consistent with the planned level and unique per node.

Configure the appropriate provider bridge service tag and preserve customer inner tags across the carrier handoff. Its normal acceptance signal would be captured service frames show the expected outer provider tag and unchanged customer tag, with distinct customers isolated. Here the deciding check is different: neighbor state and system IDs show unique routers, and Level 1 adjacency establishes only among compatible area peers.

OSPF chooses lowest-cost paths computed from link-state topology; a Full adjacency alone does not guarantee the desired route preference. That describes OSPF interface metric selection, whereas the observed symptoms are caused by OSPF point-to-point topology; it does not predict the reported behavior.

This principle matters when troubleshooting MSTP region consistency, but using it here mistakes a different failure mode for OSPF point-to-point topology. The relevant distinction is: OSPF point-to-point interfaces do not use a DR or BDR; this differs from a shared multiaccess Ethernet network.

Although OSPF MTU negotiation needs this consideration, the failure at issue has a different cause. OSPF point-to-point interfaces do not use a DR or BDR; this differs from a shared multiaccess Ethernet network.

Although VRRP virtual gateway failover needs this consideration, the failure at issue has a different cause. Graceful restart depends on protocol restart and helper behavior; it is not identical to copying live routing protocol state to a backup Routing Engine.

This principle matters when troubleshooting stable OSPF router identifier, but using it here mistakes a different failure mode for graceful restart peer assistance. The relevant distinction is: graceful restart depends on protocol restart and helper behavior; it is not identical to copying live routing protocol state to a backup Routing Engine.

GRES preserves forwarding and kernel state but does not by itself preserve all routing or bridging state; NSB targets bridge continuity and NSR or graceful restart addresses routing continuity. That describes GRES preserves forwarding not protocols, whereas the observed symptoms are caused by graceful restart peer assistance; it does not predict the reported behavior.

MSTP region identity depends on consistent name, revision, and VLAN mapping; mismatches create region boundaries. Those conditions do not account for the specific IPv6 over IPv4 tunnel underlay problem reported by Winterfield Utilities.

OSPFv3 provides OSPF routing for IPv6; successful IPv4 OSPFv2 peering does not establish an IPv6 adjacency. Those conditions do not account for the specific IPv6 over IPv4 tunnel underlay problem reported by Winterfield Utilities.

Although IPv6 neighbor discovery filtering 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.

Treat the reserved or martian prefix as invalid for production routing and correct the source instead of overriding safety rejection blindly. This addresses martian source address rejection, but the reported symptoms arise from aggregate route contributor. For this case, verify instead that the aggregate is active only with the expected contributors and disappears when the contributor precondition is removed.

Apply an approved outbound AS-path prepend policy on the less-preferred advertised path and validate what peers receive. That could help in a case involving AS-path prepend inbound influence. This failure instead depends on aggregate route contributor; an aggregate route is conditional on active contributing routes and normally uses a discard or reject next hop to avoid creating a forwarding loop.

The proposal changes generated route qualified next hop; that is not the failure isolated by the facts. It could leave aggregate route contributor unresolved even if its own test passed. An aggregate route is conditional on active contributing routes and normally uses a discard or reject next hop to avoid creating a forwarding loop.

This measurement tests graceful restart peer assistance; it cannot distinguish success from failure for the observed BFD fast failure detection condition. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

The check is meaningful for flexible VLAN encapsulation alignment, but it does not prove that BFD fast failure detection was repaired. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

This measurement tests NSR protocol state replication; it cannot distinguish success from failure for the observed BFD fast failure detection condition. BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.