Juniper JN0-364 Practice Test 12
Question 110
A Junos service-provider engineer is reviewing this operational case: A provider transit VLAN has a DR and multiple attached routers. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.
- Assign supported OSPF costs reflecting approved routing intent
- Check the network LSA originator and attached router list
- Review tunnel MTU and supported PMTUD handling
- Select and configure distinct persistent router IDs
Explanation
Correct Answer
B:Check the network LSA originator and attached router list is the best implementation and troubleshooting step for this Junos service-provider case: A provider transit VLAN has a DR and multiple attached routers. Technical basis: The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Incorrect Answers
A:Assign supported OSPF costs reflecting approved routing intent is relevant to the different engineering topic "OSPF interface metric selection", but it is not the most directly supported implementation and troubleshooting step for this precise case: A provider transit VLAN has a DR and multiple attached routers. the best answer here is: Check the network LSA originator and attached router list.
C:That option concerns GRE MTU and encapsulation overhead. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
D:Select and configure distinct persistent router IDs is relevant to the different engineering topic "OSPF router-ID uniqueness", but it is not the most directly supported implementation and troubleshooting step for this precise case: A provider transit VLAN has a DR and multiple attached routers. the best answer here is: Check the network LSA originator and attached router list.
Question 111
A Junos service-provider engineer is reviewing this operational case: A provider transit VLAN has a DR and multiple attached routers. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.
- The prefix is originated but no loopback adjacency is expected
- The advertising DR represents the broadcast segment accurately
- The tunnel stays operational without recursive next-hop resolution
- One Full adjacency forms without requiring a LAN DR election
Explanation
Correct Answer
B:The advertising DR represents the broadcast segment accurately is the best operational verification evidence for this Junos service-provider case: A provider transit VLAN has a DR and multiple attached routers. Technical basis: The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Incorrect Answers
A:The prefix is originated but no loopback adjacency is expected is relevant to the different engineering topic "OSPF passive-interface and export policy", but it is not the most directly supported operational verification evidence for this precise case: A provider transit VLAN has a DR and multiple attached routers. the best answer here is: The advertising DR represents the broadcast segment accurately.
C:That option concerns GRE underlay route recursion. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
D:That option concerns OSPF interface network type. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Question 112
A provider network team identifies this situation: A LAN loses its DR and its network LSA unexpectedly ages. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.
- Interpret root, designated and alternate port roles relative to the elected bridge
- Place interfaces in the correct OSPF area and maintain intended backbone connectivity
- Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces
- Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network
Explanation
Correct Answer
D:Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network is the best technical design or decision for this Junos service-provider case: A LAN loses its DR and its network LSA unexpectedly ages. Technical basis: The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Incorrect Answers
A:That option concerns STP root and designated port roles. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
B:Place interfaces in the correct OSPF area and maintain intended backbone connectivity is relevant to the different engineering topic "OSPF backbone membership", but it is not the most directly supported technical design or decision for this precise case: A LAN loses its DR and its network LSA unexpectedly ages. the best answer here is: Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network.
C:Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces is relevant to the different engineering topic "OSPF passive-interface and export policy", but it is not the most directly supported technical design or decision for this precise case: A LAN loses its DR and its network LSA unexpectedly ages. the best answer here is: Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network.
Question 113
A provider network team identifies this situation: A LAN loses its DR and its network LSA unexpectedly ages. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.
- Check election and network-LSA refresh activity
- Review ABR and backbone reachability before changing interface metrics
- Inspect advertised and received label mappings for the target FEC
- Review the LSDB for the advertisement before changing forwarding entries
Explanation
Correct Answer
A:Check election and network-LSA refresh activity is the best implementation and troubleshooting step for this Junos service-provider case: A LAN loses its DR and its network LSA unexpectedly ages. Technical basis: The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Incorrect Answers
B:Review ABR and backbone reachability before changing interface metrics is relevant to the different engineering topic "OSPF backbone membership", but it is not the most directly supported implementation and troubleshooting step for this precise case: A LAN loses its DR and its network LSA unexpectedly ages. the best answer here is: Check election and network-LSA refresh activity.
C:That option concerns MPLS label binding and retention. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
D:That option concerns OSPF LSDB synchronization. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Question 114
A provider network team identifies this situation: A LAN loses its DR and its network LSA unexpectedly ages. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.
- The new DR represents the attached routers after convergence
- The unintended default is withdrawn without suppressing required prefixes
- The route resolves over the least-cost eligible topology
- Operational OSPF state reflects the intended stable identifier
Explanation
Correct Answer
A:The new DR represents the attached routers after convergence is the best operational verification evidence for this Junos service-provider case: A LAN loses its DR and its network LSA unexpectedly ages. Technical basis: The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
Incorrect Answers
B:That option concerns BGP outbound advertisement policy. The DR represents attached routers in a network LSA, whereas point-to-point topologies do not require one.
C:The route resolves over the least-cost eligible topology is relevant to the different engineering topic "OSPF interface metric selection", but it is not the most directly supported operational verification evidence for this precise case: A LAN loses its DR and its network LSA unexpectedly ages. the best answer here is: The new DR represents the attached routers after convergence.
D:Operational OSPF state reflects the intended stable identifier is relevant to the different engineering topic "OSPF router-ID uniqueness", but it is not the most directly supported operational verification evidence for this precise case: A LAN loses its DR and its network LSA unexpectedly ages. the best answer here is: The new DR represents the attached routers after convergence.
Question 115
A Junos service-provider engineer is reviewing this operational case: Two parallel core links have different design capacities. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.
- Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces
- Interpret type-one Router LSAs as router-local link information scoped to an OSPF area
- Apply appropriate OSPF interface costs and validate expected shortest paths
- Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains
Explanation
Correct Answer
C:Apply appropriate OSPF interface costs and validate expected shortest paths is the best technical design or decision for this Junos service-provider case: Two parallel core links have different design capacities. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
A:That option concerns OSPF passive-interface and export policy. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
B:That option concerns Router-LSA type-one interpretation. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
D:That option concerns Virtual-switch routing instance. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Question 116
A Junos service-provider engineer is reviewing this operational case: Two parallel core links have different design capacities. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.
- Assign supported OSPF costs reflecting approved routing intent
- Apply supported loop protection at the appropriate role
- Set its OSPF interface priority to zero
- Configure a supported OSPF point-to-point interface type on both ends
Explanation
Correct Answer
A:Assign supported OSPF costs reflecting approved routing intent is the best implementation and troubleshooting step for this Junos service-provider case: Two parallel core links have different design capacities. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
B:That option concerns Loop protection when BPDUs vanish. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
C:Set its OSPF interface priority to zero is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two parallel core links have different design capacities. the best answer here is: Assign supported OSPF costs reflecting approved routing intent.
D:That option concerns OSPF interface network type. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Question 117
A Junos service-provider engineer is reviewing this operational case: Two parallel core links have different design capacities. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.
- Both peers exchange compatible hellos and adjacency progresses
- The SPF next hop prefers the intended lower-cost path
- The intended prefix segments appear in the forwarding state
- Another eligible router holds the DR role while the aggregation router stays DROther
Explanation
Correct Answer
B:The SPF next hop prefers the intended lower-cost path is the best operational verification evidence for this Junos service-provider case: Two parallel core links have different design capacities. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
A:That option concerns OSPF hello/dead agreement. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
C:The intended prefix segments appear in the forwarding state is relevant to the different engineering topic "Segment-routing MPLS prefix SIDs", but it is not the most directly supported operational verification evidence for this precise case: Two parallel core links have different design capacities. the best answer here is: The SPF next hop prefers the intended lower-cost path.
D:Another eligible router holds the DR role while the aggregation router stays DROther is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported operational verification evidence for this precise case: Two parallel core links have different design capacities. the best answer here is: The SPF next hop prefers the intended lower-cost path.
Question 118
A provider network team identifies this situation: A route unexpectedly selects a low-bandwidth core circuit. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.
- Match GRE tunnel source/destination endpoints to reachable transport addresses
- Apply appropriate OSPF interface costs and validate expected shortest paths
- Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network
- Interpret the 2Way and Full states according to OSPF network type and DR roles
Explanation
Correct Answer
B:Apply appropriate OSPF interface costs and validate expected shortest paths is the best technical design or decision for this Junos service-provider case: A route unexpectedly selects a low-bandwidth core circuit. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
A:That option concerns GRE source and destination addressing. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
C:Recognize a type-two Network LSA generated for an appropriate transit multi-access OSPF network is relevant to the different engineering topic "Network-LSA type-two interpretation", but it is not the most directly supported technical design or decision for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: Apply appropriate OSPF interface costs and validate expected shortest paths.
D:Interpret the 2Way and Full states according to OSPF network type and DR roles is relevant to the different engineering topic "OSPF two-way versus full neighbors", but it is not the most directly supported technical design or decision for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: Apply appropriate OSPF interface costs and validate expected shortest paths.
Question 119
A provider network team identifies this situation: A route unexpectedly selects a low-bandwidth core circuit. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.
- Compare MTU, network type and DBD negotiation before enabling any workaround
- Review local SRGB interpretation and IGP SID advertisements
- Inspect configured ID and process restart requirements
- Inspect accumulated OSPF costs rather than physical link naming
Explanation
Correct Answer
D:Inspect accumulated OSPF costs rather than physical link naming is the best implementation and troubleshooting step for this Junos service-provider case: A route unexpectedly selects a low-bandwidth core circuit. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
A:Compare MTU, network type and DBD negotiation before enabling any workaround is relevant to the different engineering topic "OSPF two-way versus full neighbors", but it is not the most directly supported implementation and troubleshooting step for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: Inspect accumulated OSPF costs rather than physical link naming.
B:Review local SRGB interpretation and IGP SID advertisements is relevant to the different engineering topic "Segment-routing MPLS prefix SIDs", but it is not the most directly supported implementation and troubleshooting step for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: Inspect accumulated OSPF costs rather than physical link naming.
C:Inspect configured ID and process restart requirements is relevant to the different engineering topic "OSPF router-ID uniqueness", but it is not the most directly supported implementation and troubleshooting step for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: Inspect accumulated OSPF costs rather than physical link naming.
Question 120
A provider network team identifies this situation: A route unexpectedly selects a low-bandwidth core circuit. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.
- DR changes only as defined by normal election or controlled topology events
- The new DR represents the attached routers after convergence
- The route resolves over the least-cost eligible topology
- The service fails or continues only according to the approved threshold
Explanation
Correct Answer
C:The route resolves over the least-cost eligible topology is the best operational verification evidence for this Junos service-provider case: A route unexpectedly selects a low-bandwidth core circuit. Technical basis: OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.
Incorrect Answers
A:DR changes only as defined by normal election or controlled topology events is relevant to the different engineering topic "OSPF DR/BDR priority election", but it is not the most directly supported operational verification evidence for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: The route resolves over the least-cost eligible topology.
B:The new DR represents the attached routers after convergence is relevant to the different engineering topic "Network-LSA type-two interpretation", but it is not the most directly supported operational verification evidence for this precise case: A route unexpectedly selects a low-bandwidth core circuit. the best answer here is: The route resolves over the least-cost eligible topology.
D:That option concerns Aggregated-Ethernet minimum links. OSPF computes cost-based shortest paths from link-state metrics, not BGP local preference.