Be able to configure OSPFv3 under the inet6 address family, read neighbor and LSA output to confirm adjacency and prefix propagation, and write export policy that redistributes routes into OSPF with the intended metric and filtering.
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Domain overview
This domain covers OSPFv2 and OSPFv3 configuration and verification on Junos devices, plus route redistribution into OSPF through routing policy. Questions test the address-family hierarchy, OSPFv3 LSA types, neighbor-state verification commands, and how export policy filters control redistributed routes.
Exam objectives
Enabling OSPFv3 under the edit protocols ospf3 address-family inet6 hierarchy on interfaces
Identifying OSPFv3 Inter-Area-Prefix, Intra-Area-Prefix, and Link LSAs versus OSPFv2 Router and Network LSAs
Verifying OSPF neighbor states and adjacency progress with show ospf neighbor and show ospf3 neighbor
Applying OSPF export policy to set metrics or match and reject redistributed routes
Configuring OSPFv3 under the inet family instead of inet6, so the interface never forms an adjacency.
Assuming OSPFv3 still uses Router and Network LSAs to carry IPv6 prefixes; prefix information moves to Intra-Area-Prefix and Inter-Area-Prefix LSAs.
Forgetting that export policy filters are evaluated before redistribution, so a reject term silently blocks routes from entering OSPF.
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When configuring OSPFv3, which Junos address-family hierarchy is used to enable OSPFv3 on an interface?
2Which Junos command displays the link-state database for OSPFv2, showing router LSAs and network LSAs?
3An administrator needs to filter Type-3 LSAs entering an OSPF stub area on a Junos routing device. Which statement under the area hierarchy is required?
4You are configuring OSPFv2 on a Junos device and need to inject default routes into an OSPF NSSA area. Which configuration command under protocols ospf area should be used?
5What is the default OSPF reference bandwidth in Junos OS?
6You want to change the OSPF reference bandwidth globally on a Junos routing device to accurately calculate costs for high-speed interfaces. Where is this configured?
7Which command verifies the OSPF neighbor states and adjacency progress on a Junos device?
8Which Junos configuration command enables MD5 cryptographic authentication on an OSPFv2 interface?
9You need to modify the priority of a Junos OSPF interface to ensure it becomes the designated router (DR). Which command accomplishes this?
10Which statement correctly describes the function of an OSPF Stub Area?
11How do you examine the specific OSPF routing table entries learned via OSPF on a Junos device?
12You are configuring an OSPF NSSA and want to suppress the translation of Type-7 LSAs into Type-5 LSAs on one of the ABRs because another ABR is already performing the translation. Which statement is used?
13You need to adjust the OSPF cost on a specific interface to manipulate path selection. Which command sets the OSPF cost on an interface?
14You are configuring OSPF database overflow protection to prevent a router from running out of memory due to an excessive number of external LSAs in the LSDB. Which configuration enables this feature globally?
15Which TWO actions can be performed by an OSPF routing policy export filter when redistributing routes into OSPF? (Choose two)
16Which THREE types of LSAs are blocked from entering an OSPF Totally Stubby Area? (Choose three)
17When configuring OSPF sham-links in Junos to support MPLS VPN back-door links, which TWO characteristics apply? (Choose two)
18Which TWO commands are used to troubleshoot OSPF issues on Junos devices? (Choose two)
19Which TWO types of OSPF areas allow the generation of Type-7 LSAs? (Choose two)
20Which THREE mechanisms are utilized by Junos to protect OSPF routing operations and control plane resources? (Choose three)
21Which THREE configuration tasks are required when implementing OSPFv3 on Junos devices? (Choose three)
22You are redistributing BGP routes into OSPF on an MX Series router. By default, what metric type and cost are assigned to these redistributed routes when they enter the OSPF domain?
23Which OSPFv3 LSA type is responsible for carrying IPv6 prefix information within the same area, replacing the role of Router and Network LSAs carrying IP addresses in OSPFv2?
24Which Junos configuration hierarchy is used to disable the generation of OSPF Type-7 to Type-5 LSA translation on an NSSA Area Border Router (ABR)?
25Which TWO statements are correct regarding OSPF NSSA (Not-So-Stubby Area) behavior and configuration in Junos OS? (Choose two)
26You are troubleshooting an OSPF adjacency between two Juniper Networks routers on a broadcast Ethernet segment. The routers are in the same area and have matching hello and dead intervals. The adjacency remains in ExStart state. Which OSPF parameter mismatch is the most likely cause?
27You manage a Juniper Networks enterprise network using OSPF. Router R1 and Router R2 are connected via a point-to-point link. R1 is configured with the interface ge-0/0/0.0 in area 0 with a hello interval of 10 seconds and a dead interval of 40 seconds. R2 has the same interface in area 0 but with a hello interval of 30 seconds and a dead interval of 120 seconds. After configuration, the OSPF adjacency does not form. Which action will resolve the issue?
28You are configuring OSPF on a Juniper Networks router. You want to influence the DR/BDR election on a broadcast segment so that a specific router becomes the DR. Which configuration statement should you apply to the interface?
29You are configuring OSPFv3 on a Junos router and need to enable it on an interface that has IPv6 enabled. Which configuration statement is required to activate OSPFv3 on that interface?
30You are configuring OSPF on a Junos router and want to summarize routes from area 1 into area 0. The router is an ABR. Which configuration statement accomplishes this?
31You are troubleshooting an OSPF network where a Juniper router is not installing a particular OSPF route into its routing table. The route is present in the OSPF link-state database as an external LSA, but it is not in the inet.0 table. You have verified that the route is not filtered by any policy. What is the most likely cause?
Be able to configure OSPFv3 under the inet6 address family, read neighbor and LSA output to confirm adjacency and prefix propagation, and write export policy that redistributes routes into OSPF with the intended metric and filtering.
The Courseiva JNCIP-ENT question bank contains 31 questions in the Interior Gateway Protocols domain. Click any question to see the full explanation and answer breakdown.
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