Juniper JN0-364 Questions & Answers

Keep GRES for forwarding continuity and enable the appropriate supported NSB for bridging or NSR or graceful restart for routing sessions as required. That could help in a case involving GRES preserves forwarding not protocols. This failure instead depends on graceful restart peer assistance; graceful restart depends on protocol restart and helper behavior; it is not identical to copying live routing protocol state to a backup Routing Engine.

Configure and verify the intended VSTP instance and per-VLAN root priorities for the affected VLANs. Its normal acceptance signal would be each VLAN's spanning-tree state selects its planned root and forwarding ports without creating a cross-VLAN loop. Here the deciding check is different: during a controlled routing restart, participating neighbors retain forwarding state only for the permitted grace interval and then converge correctly.

Align VRRP group, virtual gateway addressing and priority settings and verify master-to-backup handover. That could help in a case involving VRRP virtual gateway failover. This failure instead depends on graceful restart peer assistance; graceful restart depends on protocol restart and helper behavior; it is not identical to copying live routing protocol state to a backup Routing Engine.

Check inter-area prefix availability at each ABR after changes to area boundaries and route filters. The monitored boundary differs from OSPF designated router election, so the original weakness might reappear unnoticed. OSPF broadcast networks elect a DR and BDR; raising priority does not automatically preempt an already elected DR.

Review tunnel transport security requirements and verify encryption rather than accepting GRE setup as proof of privacy. That ongoing check is for GRE confidentiality limitation; it would not reliably detect recurrence of OSPF designated router election. OSPF broadcast networks elect a DR and BDR; raising priority does not automatically preempt an already elected DR.

The control protects OSPF MTU negotiation. It does not establish the ongoing OSPF designated router election behavior required in this network. OSPF broadcast networks elect a DR and BDR; raising priority does not automatically preempt an already elected DR.

Although EBGP multihop reachability needs this consideration, the failure at issue has a different cause. MED is a BGP path hint with lower values generally preferred when compared; it is not a guarantee of inbound routing across arbitrary networks.

Although AS-path prepend inbound influence needs this consideration, the failure at issue has a different cause. MED is a BGP path hint with lower values generally preferred when compared; it is not a guarantee of inbound routing across arbitrary networks.

Routing instances maintain separate routing and forwarding contexts; entries in one RIB do not automatically appear in another. Those conditions do not account for the specific BGP MED neighbor consideration problem reported by Northbay Telecom.

Enable supported NSR with required GRES on the platform, then verify routing protocol state replication and switchover behavior. This addresses NSR protocol state replication, but the reported symptoms arise from BFD fast failure detection. For this case, verify instead that A controlled link or peer failure causes BFD Down and timely routing reconvergence rather than waiting for long protocol timers.

Align LACP negotiation and member compatibility on both ends, then verify collecting and distributing member state. This addresses LACP aggregation consistency, but the reported symptoms arise from BFD fast failure detection. For this case, verify instead that A controlled link or peer failure causes BFD Down and timely routing reconvergence rather than waiting for long protocol timers.

Set an end-to-end MTU that accounts for required additional Ethernet tags and verify supported hardware limits. That could help in a case involving provider bridging MTU overhead. This failure instead depends on BFD fast failure detection; BFD provides rapid bidirectional path liveness detection; it triggers routing response but is not by itself a replacement route.

Neighbor Solicitation and Advertisement complete and the destination's link-layer neighbor entry becomes usable. That establishes IPv6 neighbor discovery filtering rather than a repaired IPv6 static next-hop scope path. The reported failure still requires this evidence: the intended IPv6 destination has an active route with a resolved next hop and working egress interface.

This measurement tests stable OSPF router identifier; it cannot distinguish success from failure for the observed IPv6 static next-hop scope condition. IPv6 link-local next hops are interface-scoped; a bare link-local address can be insufficient to identify the outgoing link.

Both IPv4 endpoint paths are reachable and IPv6 packets traverse the encapsulated link end to end. That establishes IPv6 over IPv4 tunnel underlay rather than a repaired IPv6 static next-hop scope path. The reported failure still requires this evidence: the intended IPv6 destination has an active route with a resolved next hop and working egress interface.

Add an approved encryption layer such as IPsec when confidentiality is required, while retaining GRE only if needed for routing encapsulation. Its normal acceptance signal would be an underlay capture cannot read protected payload content and transport still reaches the required tunnel endpoints. Here the deciding check is different: maximum expected encapsulated packets cross the tunnel without fragmentation blackholes or oversized drop counters.

Bind the correct VLAN bridge domain to its intended IRB routed interface and verify gateway addressing and routing. This addresses integrated routing and bridging, but the reported symptoms arise from GRE tunnel path MTU. For this case, verify instead that maximum expected encapsulated packets cross the tunnel without fragmentation blackholes or oversized drop counters.

Install and verify independent underlay reachability for the GRE outer destination, preventing recursive use of the tunnel. That could help in a case involving GRE recursive route avoidance. This failure instead depends on GRE tunnel path MTU; GRE adds header bytes, reducing effective payload MTU across an unchanged underlay path.

Apply root protection on boundary designated ports where upstream superiority must be blocked and verify root placement. Its normal acceptance signal would be the approved root remains root despite inferior-site superior-BPDU injection, and the boundary behaves as designed. Here the deciding check is different: adjacent devices report matching MST region configuration and VLANs map to the same intended instances.

Align the port's supported flexible VLAN tagging and per-unit encapsulation with the intended service frame format. This addresses flexible VLAN encapsulation alignment, but the reported symptoms arise from MSTP region consistency. For this case, verify instead that adjacent devices report matching MST region configuration and VLANs map to the same intended instances.

The proposal changes RSTP alternate port reconvergence; that is not the failure isolated by the facts. It could leave MSTP region consistency unresolved even if its own test passed. MSTP region identity depends on consistent name, revision, and VLAN mapping; mismatches create region boundaries.

Enable compatible OSPFv3 IPv6 operation on the intended peers and validate neighbor and route state. This addresses OSPFv3 IPv6 neighbor reachability, but the reported symptoms arise from IPv6 neighbor discovery filtering. For this case, verify instead that neighbor Solicitation and Advertisement complete and the destination's link-layer neighbor entry becomes usable.

Enable and verify negotiated IPv6-unicast capability and matching route-policy handling on the BGP peers. Its normal acceptance signal would be BGP peers exchange the intended IPv6 NLRI and establish resolvable IPv6 next hops. Here the deciding check is different: neighbor Solicitation and Advertisement complete and the destination's link-layer neighbor entry becomes usable.

The proposal changes graceful restart peer assistance; that is not the failure isolated by the facts. It could leave IPv6 neighbor discovery filtering unresolved even if its own test passed. IPv6 Neighbor Discovery uses ICMPv6 to resolve on-link next hops; blocking it disrupts forwarding even if static routes exist.

This measurement tests EBGP multihop reachability; it cannot distinguish success from failure for the observed IS-IS LAN designated intermediate system condition. On an IS-IS broadcast LAN the DIS originates pseudonode LSPs and may be re-elected when priority changes; the process differs from OSPF DR behavior.

The check is meaningful for IS-IS TLV reachability, but it does not prove that IS-IS LAN designated intermediate system was repaired. On an IS-IS broadcast LAN the DIS originates pseudonode LSPs and may be re-elected when priority changes; the process differs from OSPF DR behavior.

The two peers converge to consistent current LSP sequence information and compute the same intended topology reachability. That establishes IS-IS LSP database synchronization rather than a repaired IS-IS LAN designated intermediate system path. The reported failure still requires this evidence: the shared LAN shows the intended DIS and pseudonode information, and adjacency remains stable through a controlled election. Applied here, the relevant facts are: A topology analyzer treats an IS-IS DIS as identical to an OSPF nonpreemptive DR, giving incorrect convergence expectations after priority changes. The question asks which observation would most directly establish that the reported failure has been repaired.

This principle matters when troubleshooting IPv6 neighbor discovery filtering, but using it here mistakes a different failure mode for OSPFv3 IPv6 neighbor reachability. The relevant distinction is: OSPFv3 provides OSPF routing for IPv6; successful IPv4 OSPFv2 peering does not establish an IPv6 adjacency.

IS-IS can carry IPv6 topology and prefix information using appropriate TLVs; an IPv4 route table is not a substitute. Those conditions do not account for the specific OSPFv3 IPv6 neighbor reachability problem reported by Foxglove Broadband.

This principle matters when troubleshooting BGP MED neighbor consideration, but using it here mistakes a different failure mode for OSPFv3 IPv6 neighbor reachability. The relevant distinction is: OSPFv3 provides OSPF routing for IPv6; successful IPv4 OSPFv2 peering does not establish an IPv6 adjacency.

The control protects IPv6 static next-hop scope. It does not establish the ongoing IPv6 neighbor discovery filtering behavior required in this network. IPv6 Neighbor Discovery uses ICMPv6 to resolve on-link next hops; blocking it disrupts forwarding even if static routes exist.

Track IPv4 and IPv6 IS-IS reachability separately in dual-stack health checks. The monitored boundary differs from IPv6 neighbor discovery filtering, so the original weakness might reappear unnoticed. IPv6 Neighbor Discovery uses ICMPv6 to resolve on-link next hops; blocking it disrupts forwarding even if static routes exist.

The control protects RSVP PATH and RESV signaling. It does not establish the ongoing IPv6 neighbor discovery filtering behavior required in this network. IPv6 Neighbor Discovery uses ICMPv6 to resolve on-link next hops; blocking it disrupts forwarding even if static routes exist.