Juniper JN0-364 Questions & Answers

Audit VSTP per-VLAN root topology after new VLAN or trunk additions. That ongoing check is for VSTP per-VLAN root choice; it would not reliably detect recurrence of RSTP loop protection. Loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

The control protects MPLS label stack bottom bit. It does not establish the ongoing RSTP loop protection behavior required in this network. Loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

Rehearse planned root-link failures and verify alternate-port transitions and absence of loop symptoms. The monitored boundary differs from RSTP loop protection, so the original weakness might reappear unnoticed. Loop protection protects non-designated ports against false transition to forwarding when expected BPDUs disappear.

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 intended destination appears as an active route with a resolvable next hop in the routing table and forwarding table.

Inspect the forwarding lookup in the correct routing instance and apply explicit, authorized route sharing only where required. This addresses routing instance separation, but the reported symptoms arise from static route next-hop resolution. For this case, verify instead that the intended destination appears as an active route with a resolvable next hop in the routing table and forwarding table.

Configure a scoped RIB group for the eligible interface or route source and validate that the route appears in the required secondary table. Its normal acceptance signal would be the shared connected route exists in both intended RIBs without broadly importing unrelated customer prefixes. Here the deciding check is different: the intended destination appears as an active route with a resolvable next hop in the routing table and forwarding table.

Audit explicit segment lists against intended physical-hop constraints before deployment. The monitored boundary differs from LDP transport address reachability, so the original weakness might reappear unnoticed. LDP discovery and session setup are distinct; a transport TCP connection must be reachable after hello discovery.

The control protects BGP import export control. It does not establish the ongoing LDP transport address reachability behavior required in this network. LDP discovery and session setup are distinct; a transport TCP connection must be reachable after hello discovery.

Alert on missing LDP label mappings for required FECs after peer resets and topology changes. The monitored boundary differs from LDP transport address reachability, so the original weakness might reappear unnoticed. LDP discovery and session setup are distinct; a transport TCP connection must be reachable after hello discovery.

Assign each OSPF router a unique stable router ID and confirm the resulting neighbor and link-state database identities. That could help in a case involving stable OSPF router identifier. This failure instead depends on IS-IS LAN designated intermediate system; 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.

Set compatible IS-IS circuit levels on both ends of the interface and verify hello and neighbor state. This addresses IS-IS adjacency circuit level, but the reported symptoms arise from IS-IS LAN designated intermediate system. For this case, verify instead that the shared LAN shows the intended DIS and pseudonode information, and adjacency remains stable through a controlled election.

Inspect the IS-IS link-state database and CSNP/PSNP exchange to resolve synchronization or flooding problems. Its normal acceptance signal would be the two peers converge to consistent current LSP sequence information and compute the same intended topology reachability. Here the deciding check is different: the shared LAN shows the intended DIS and pseudonode information, and adjacency remains stable through a controlled election.

Correct the locally expected peer AS and actual neighbor AS identity and validate the BGP OPEN exchange. That could help in a case involving BGP ASN and OPEN negotiation. This failure instead depends on BGP next-hop reachability; A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

The proposal changes IBGP route reflection; that is not the failure isolated by the facts. It could leave BGP next-hop reachability unresolved even if its own test passed. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

The proposal changes RIB group route sharing; that is not the failure isolated by the facts. It could leave BGP next-hop reachability unresolved even if its own test passed. A BGP path is not usable merely because UPDATE is received; next-hop resolution is required for route selection and installation.

Inspect label forwarding entries at ingress, transit, and egress after every LSP change. That ongoing check is for MPLS label push swap pop; it would not reliably detect recurrence of LDP neighbor discovery. LDP uses discovery messages on enabled interfaces before exchanging label mappings; IGP reachability alone does not start LDP.

This is a useful guard against MPLS label forwarding table mismatch, but it is not scoped to the observed LDP neighbor discovery failure. An appropriate test would show that the intended interface discovers the peer and the LDP neighbor appears with an operational session. Applied here, the relevant facts are: After enabling MPLS forwarding on a new link, Junos does not discover an LDP neighbor because LDP discovery is not enabled on that interface. The question asks which ongoing control would most directly detect or prevent the same failure from recurring.

Compare advertised OSPF timers during provisioning and alert on repeated neighbor-down events. That ongoing check is for OSPF hello and dead timers; it would not reliably detect recurrence of LDP neighbor discovery. LDP uses discovery messages on enabled interfaces before exchanging label mappings; IGP reachability alone does not start LDP.

This principle matters when troubleshooting OSPF point-to-point topology, but using it here mistakes a different failure mode for OSPF designated router election. The relevant distinction is: OSPF broadcast networks elect a DR and BDR; raising priority does not automatically preempt an already elected DR.

GRE provides encapsulation and protocol carriage but does not inherently supply confidentiality or cryptographic integrity. That describes GRE confidentiality limitation, whereas the observed symptoms are caused by OSPF designated router election; it does not predict the reported behavior.

OSPF chooses lowest-cost paths computed from link-state topology; a Full adjacency alone does not guarantee the desired route preference. Those conditions do not account for the specific OSPF designated router election problem reported by Hawthorne Metro.

Check forwarding-table next-hop sets and multi-flow traffic after any export-policy or path-cost change. That ongoing check is for equal-cost forwarding flow hashing; it would not reliably detect recurrence of generated route qualified next hop. Generated routes can derive their next-hop behavior from qualifying contributing routes, unlike aggregate discard summaries.

The control protects filter-based forwarding table selection. It does not establish the ongoing generated route qualified next hop behavior required in this network. Generated routes can derive their next-hop behavior from qualifying contributing routes, unlike aggregate discard summaries.

Continuously diff effective import/export policies against approved prefix filters and peer relationships. The monitored boundary differs from generated route qualified next hop, so the original weakness might reappear unnoticed. Generated routes can derive their next-hop behavior from qualifying contributing routes, unlike aggregate discard summaries.

The intended service route is advertised while nonapproved connected and static prefixes remain outside the IS-IS domain. That establishes IS-IS route redistribution policy rather than a repaired IS-IS TLV reachability path. The reported failure still requires this evidence: link-state PDUs include the intended reachability TLVs and the matching routes populate peer routing tables.

The check is meaningful for IS-IS LSP database synchronization, but it does not prove that IS-IS TLV reachability was repaired. IS-IS uses TLVs inside its PDUs to encode prefix and protocol capabilities; adjacency alone is not proof of expected reachability advertisements.

The check is meaningful for BGP next-hop reachability, but it does not prove that IS-IS TLV reachability was repaired. IS-IS uses TLVs inside its PDUs to encode prefix and protocol capabilities; adjacency alone is not proof of expected reachability advertisements.

Test double-tag preservation and S-tag membership on both ends of each provider handoff. That ongoing check is for provider Q-in-Q tagging; it would not reliably detect recurrence of VSTP per-VLAN root choice. VSTP maintains spanning-tree behavior per VLAN; one VLAN's root decision does not automatically govern every VLAN.

The control protects RSTP edge BPDU protection. It does not establish the ongoing VSTP per-VLAN root choice behavior required in this network. VSTP maintains spanning-tree behavior per VLAN; one VLAN's root decision does not automatically govern every VLAN.

The control protects RSTP root protection. It does not establish the ongoing VSTP per-VLAN root choice behavior required in this network. VSTP maintains spanning-tree behavior per VLAN; one VLAN's root decision does not automatically govern every VLAN.

Verify full label stack ordering and bottom-of-stack indication on the encapsulated service path. This addresses MPLS label stack bottom bit, but the reported symptoms arise from provider Q-in-Q tagging. For this case, verify instead that captured service frames show the expected outer provider tag and unchanged customer tag, with distinct customers isolated.

Set access or trunk interface mode to match the attached device and approved VLAN membership. That could help in a case involving VLAN access trunk distinction. This failure instead depends on provider Q-in-Q tagging; Q-in-Q carries an additional provider VLAN tag around customer-tagged traffic to isolate services with overlapping customer VLAN numbers.

The proposal changes virtual-switch instance isolation; that is not the failure isolated by the facts. It could leave provider Q-in-Q tagging unresolved even if its own test passed. Q-in-Q carries an additional provider VLAN tag around customer-tagged traffic to isolate services with overlapping customer VLAN numbers.