Juniper JN0-364 Questions & Answers

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.

This measurement tests stable OSPF router identifier; it cannot distinguish success from failure for the observed generated route qualified next hop condition. Generated routes can derive their next-hop behavior from qualifying contributing routes, unlike aggregate discard summaries.

Only the selected traffic uses the inspection forwarding table while unmatched traffic follows the ordinary destination route. That establishes filter-based forwarding table selection rather than a repaired generated route qualified next hop path. The reported failure still requires this evidence: the generated route becomes active when eligible contributors exist and forwards through the intended resolved contributing next hop.

The affected customer's lookup uses the intended instance RIB and reaches only the destinations deliberately made available to that instance. It would validate a separate routing instance separation operation, not the change needed here. Confirm instead that the generated route becomes active when eligible contributors exist and forwards through the intended resolved contributing next hop.

The proposal changes BGP local preference; that is not the failure isolated by the facts. It could leave AS-path prepend inbound influence unresolved even if its own test passed. AS-path prepending can make a path less attractive to other ASes but does not override their local policies or guarantee inbound steering.

The proposal changes BGP MED neighbor consideration; that is not the failure isolated by the facts. It could leave AS-path prepend inbound influence unresolved even if its own test passed. AS-path prepending can make a path less attractive to other ASes but does not override their local policies or guarantee inbound steering.

Use supported BFD sessions tied to the relevant routing protocol and validate fast peer failure detection. Its normal acceptance signal would be A controlled link or peer failure causes BFD Down and timely routing reconvergence rather than waiting for long protocol timers. Here the deciding check is different: external route advertisements show the intended relative AS-path lengths and measured inbound behavior is compared with the goal.

Monitor hidden BGP routes and next-hop resolution after IGP or route-reflector changes. That ongoing check is for BGP next-hop reachability; it would not reliably detect recurrence of BGP MED neighbor consideration. MED is a BGP path hint with lower values generally preferred when compared; it is not a guarantee of inbound routing across arbitrary networks.

This is a useful guard against IBGP route reflection, but it is not scoped to the observed BGP MED neighbor consideration failure. An appropriate test would show that comparably eligible paths carry intended MEDs and route selection in the agreed test case follows the planned preference.

Audit which ports are true edges and test protective action when a simulated switch sends a BPDU. The monitored boundary differs from BGP MED neighbor consideration, so the original weakness might reappear unnoticed. MED is a BGP path hint with lower values generally preferred when compared; it is not a guarantee of inbound routing across arbitrary networks.

Review RSTP roles and convergence expectations and ensure the valid alternate path can transition safely when the root path fails. This addresses RSTP alternate port reconvergence, but the reported symptoms arise from VSTP per-VLAN root choice. For this case, verify instead that each VLAN's spanning-tree state selects its planned root and forwarding ports without creating a cross-VLAN loop.

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 VSTP per-VLAN root choice. For this case, verify instead that each VLAN's spanning-tree state selects its planned root and forwarding ports without creating a cross-VLAN loop.

Set and test a coherent MED policy between comparable paths, acknowledging peer AS comparison behavior and upstream policies. This addresses BGP MED neighbor consideration, but the reported symptoms arise from VSTP per-VLAN root choice. For this case, verify instead that each VLAN's spanning-tree state selects its planned root and forwarding ports without creating a cross-VLAN loop.

Align the explicitly approved native and untagged VLAN behavior at both ends and verify tagged versus untagged traffic. Its normal acceptance signal would be untagged frames map to the intended VLAN on both devices while explicitly tagged VLAN traffic remains isolated. Here the deciding check is different: the same VLAN numbers can exist where supported without unintended MAC or broadcast leakage across isolated virtual switches.

Align the port's supported flexible VLAN tagging and per-unit encapsulation with the intended service frame format. Its normal acceptance signal would be the correct single- and double-tagged service units receive traffic matching their configured VLAN identifiers. Here the deciding check is different: the same VLAN numbers can exist where supported without unintended MAC or broadcast leakage across isolated virtual switches.

Align aggregate generation with present contributing routes and confirm the discard or reject behavior and intentional export policy. Its normal acceptance signal would be the aggregate is active only with the expected contributors and disappears when the contributor precondition is removed. Here the deciding check is different: the same VLAN numbers can exist where supported without unintended MAC or broadcast leakage across isolated virtual switches.

The same virtual gateway remains reachable when the active VRRP router is failed in a controlled test. It would validate a separate VRRP virtual gateway failover operation, not the change needed here. Confirm instead that during a controlled routing restart, participating neighbors retain forwarding state only for the permitted grace interval and then converge correctly.

Incoming labels resolve to valid outgoing label operations and interfaces, and data-plane counters show successful forwarding. It would validate a separate MPLS label forwarding table mismatch operation, not the change needed here. Confirm instead that during a controlled routing restart, participating neighbors retain forwarding state only for the permitted grace interval and then converge correctly.

This measurement tests BFD fast failure detection; it cannot distinguish success from failure for the observed graceful restart peer assistance condition. 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 is a useful guard against integrated routing and bridging, but it is not scoped to the observed virtual-switch instance isolation failure. An appropriate test would show that the same VLAN numbers can exist where supported without unintended MAC or broadcast leakage across isolated virtual switches.

The control protects RSTP loop protection. It does not establish the ongoing virtual-switch instance isolation behavior required in this network. Virtual-switch routing instances provide separate bridge contexts; similar VLAN identifiers alone do not imply shared L2 forwarding.

This is a useful guard against VLAN access trunk distinction, but it is not scoped to the observed virtual-switch instance isolation failure. An appropriate test would show that the same VLAN numbers can exist where supported without unintended MAC or broadcast leakage across isolated virtual switches.

Install and verify independent underlay reachability for the GRE outer destination, preventing recursive use of the tunnel. This addresses GRE recursive route avoidance, but the reported symptoms arise from GRE confidentiality limitation. For this case, verify instead that an underlay capture cannot read protected payload content and transport still reaches the required tunnel endpoints.

Restore underlay IP reachability between GRE tunnel endpoints and validate encapsulated probe traffic. Its normal acceptance signal would be packets to the remote outer endpoint resolve through an ordinary underlay route and GRE probes reach the peer. Here the deciding check is different: an underlay capture cannot read protected payload content and transport still reaches the required tunnel endpoints.

Configure the appropriate EBGP multihop reachability and neighbor addressing, then verify session setup on the intended loopback endpoints. This addresses EBGP multihop reachability, but the reported symptoms arise from GRE confidentiality limitation. For this case, verify instead that an underlay capture cannot read protected payload content and transport still reaches the required tunnel endpoints.

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 BGP import export control. BGP import policy governs received routes and export policy governs outbound advertisements; changing the wrong direction cannot enforce the intended boundary.

Validate local-AS and peer-AS inventory against change requests before activating external sessions. The monitored boundary differs from BGP import export control, so the original weakness might reappear unnoticed. BGP import policy governs received routes and export policy governs outbound advertisements; changing the wrong direction cannot enforce the intended boundary.

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 BGP import export control. BGP import policy governs received routes and export policy governs outbound advertisements; changing the wrong direction cannot enforce the intended boundary.

LDP supplies label bindings for eligible FECs; IP reachability without a usable label binding does not prove labeled forwarding. That describes LDP label binding completeness, whereas the observed symptoms are caused by LDP neighbor discovery; it does not predict the reported behavior.

Although RSTP root protection needs this consideration, the failure at issue has a different cause. LDP uses discovery messages on enabled interfaces before exchanging label mappings; IGP reachability alone does not start LDP.

Control-plane LSP state and data-plane label forwarding entries are separate checks; an Up session does not prove the FIB is correct. That describes MPLS label forwarding table mismatch, whereas the observed symptoms are caused by LDP neighbor discovery; it does not predict the reported behavior.