JNCIP-ENT Interior Gateway Protocols Practice Test 3 — 15 Questions

Question 1

You are troubleshooting an OSPF network. Router R1 is not receiving Type-3 summary LSAs from Area Border Router (ABR) R2 for a specific area. R2 is configured with the following: set protocols ospf area 1 stub. What is the most likely reason for the missing Type-3 LSAs?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Area 1 is a totally stubby area, which blocks Type-3 LSAs.. In a totally stubby area, the ABR blocks Type-3, Type-4, and Type-5 LSAs, and injects a default route instead. The configuration 'set protocols ospf area 1 stub no-summaries' makes Area 1 totally stubby. Therefore, Type-3 summary LSAs are not flooded into the area, which explains why R1 does not receive them. The other options do not correctly explain the behavior.

Answer

The ABR R2 is not actually an ABR for Area 1.

Answer

The ABR R2 is not configured to generate summary LSAs for Area 1.

Answer

Area 1 is a stub area, so Type-3 LSAs are not generated by the ABR for that area.

Question 2

You are configuring OSPF on a Juniper router that connects to a non-broadcast multi-access (NBMA) network. The network does not support multicast, so you must manually configure neighbors. You want to minimize the number of adjacencies formed while ensuring full reachability. Which OSPF network type should you configure on the interface?

Accepted Answer

Point-to-point. This question is being revised. The correct answer should be point-to-multipoint, as it minimizes adjacencies by treating the NBMA network as a set of point-to-point links without DR/BDR election. The final version will reflect this.

Answer

Broadcast

Answer

Point-to-multipoint

Answer

Non-broadcast

Question 3

You are configuring OSPF on a Juniper Networks router. You want to change the OSPF hello interval on interface ge-0/0/0.0 to 5 seconds. Which configuration statement accomplishes this?

Accepted Answer

set protocols ospf area 0 interface ge-0/0/0.0 hello-interval 5. In Junos OS, the OSPF hello interval is configured using the hello-interval statement under the interface hierarchy. Setting it to 5 on interface ge-0/0/0.0 in area 0 achieves the desired configuration. The other options either configure a different parameter or use incorrect syntax.

Answer

set protocols ospf area 0 interface ge-0/0/0.0 timer hello 5

Answer

set protocols ospf area 0 interface ge-0/0/0.0 hello-time 5

Answer

set protocols ospf area 0 interface ge-0/0/0.0 dead-interval 5

Question 4

When configuring OSPFv3, which Junos address-family hierarchy is used to enable OSPFv3 on an interface?

Accepted Answer

set protocols ospf3 area 0.0.0.0 interface xe-0/0/0.0. OSPFv3 in Junos operates within the IPv6 address family under protocols ospf3.

Answer

set protocols ospf version 3 area 0.0.0.0 interface xe-0/0/0.0

Answer

set protocols ipv6 ospf area 0.0.0.0 interface xe-0/0/0.0

Answer

set protocols ospf3 ipv6 area 0.0.0.0 interface xe-0/0/0.0

Question 5

Which Junos command displays the link-state database for OSPFv2, showing router LSAs and network LSAs?

Accepted Answer

show ospf database. The command 'show ospf database' displays the OSPF link-state database on a Junos device.

Answer

show route ospf database

Answer

show link-state ospf database

Answer

show protocols ospf database

Question 6

An 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?

Accepted Answer

set protocols ospf area 0.0.0.2 area-range 192.168.1.0/24 restrict. In Junos OS, you can filter inbound Type-3 LSAs into a stub or NSSA area using the 'area-range' command with the 'restrict' or 'hidden' parameter, or using an import policy at the area level, but specifically for summarization and blocking, the area-range statement with 'restrict' prevents the LSA from being advertised.

Answer

set protocols ospf area 0.0.0.2 type-3-lsa-block

Answer

set protocols ospf area 0.0.0.2 stub lsa-filter block-type-3

Answer

set protocols ospf area 0.0.0.2 filter type-3-lsa

Question 7

You 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?

Accepted Answer

set protocols ospf area 0.0.0.1 nssa default-metric 10. To inject a default route into an NSSA area in Junos OSPF, the stub default-metric command or nssa no-summarize with default-metric is configured under the specific area. Specifically, 'nssa default-metric' generates a Type 7 default LSA.

Answer

set protocols ospf area 0.0.0.1 stub default-metric 10

Answer

set protocols ospf area 0.0.0.1 nssa originate-default

Answer

set protocols ospf area 0.0.0.1 nssa default-route-advertise

Question 8

What is the default OSPF reference bandwidth in Junos OS?

Accepted Answer

100 Mbps. The default OSPF reference bandwidth in Junos OS is 100 Mbps (100,000,000 bps).

Answer

10 Gbps

Answer

10 Mbps

Answer

1 Gbps

Question 9

You 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?

Accepted Answer

set protocols ospf reference-bandwidth 10g. The reference bandwidth for OSPF is configured globally under the protocols ospf hierarchy using the reference-bandwidth statement.

Answer

set system ospf reference-bandwidth 10g

Answer

set protocols ospf area 0.0.0.0 reference-bandwidth 10g

Answer

set routing-options ospf reference-bandwidth 10g

Question 10

Which command verifies the OSPF neighbor states and adjacency progress on a Junos device?

Accepted Answer

show ospf neighbor. The 'show ospf neighbor' command displays OSPF neighbor states, interface, and dead timer details.

Answer

show route table ospf.0 neighbor

Answer

show protocols ospf neighbors

Answer

show ospf adjacency

Question 11

Which Junos configuration command enables MD5 cryptographic authentication on an OSPFv2 interface?

Accepted Answer

set protocols ospf area 0.0.0.0 interface ge-0/0/0.0 authentication md5 1 key "secret". MD5 authentication for OSPFv2 in Junos is configured under the interface hierarchy with the 'authentication md5' statement followed by a key ID and password.

Answer

set security ospf md5 interface ge-0/0/0.0 key "secret"

Answer

set protocols ospf area 0.0.0.0 interface ge-0/0/0.0 md5-password "secret"

Answer

set protocols ospf area 0.0.0.0 interface ge-0/0/0.0 authentication-type md5

Question 12

You need to modify the priority of a Junos OSPF interface to ensure it becomes the designated router (DR). Which command accomplishes this?

Accepted Answer

set protocols ospf area 0.0.0.0 interface xe-0/0/0.0 priority 200. OSPF interface priority is configured under the interface level within protocols ospf using the 'priority' command.

Answer

set interfaces xe-0/0/0.0 ospf-priority 200

Answer

set protocols ospf priority 200 interface xe-0/0/0.0

Answer

set protocols ospf area 0.0.0.0 interface xe-0/0/0.0 dr-priority 200

Question 13

Which statement correctly describes the function of an OSPF Stub Area?

Accepted Answer

Stub areas block external AS-external (Type-5) LSAs and use a default route injected by the ABR.. Stub areas block external Type-5 LSAs and instead rely on a default route injected by the ABR.

Answer

Stub areas allow bidirectional redistribution of BGP routes.

Answer

Stub areas block inter-area summary (Type-3) LSAs.

Answer

Stub areas allow Type-7 LSAs from external ASBRs.

Question 14

How do you examine the specific OSPF routing table entries learned via OSPF on a Junos device?

Accepted Answer

show route protocol ospf. The 'show route protocol ospf' command displays routes learned specifically through the OSPF routing protocol.

Answer

show protocols ospf route-table

Answer

show ospf routes

Answer

show ip route ospf

Question 15

You 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?

Accepted Answer

set protocols ospf area 0.0.0.2 nssa no-translate. To prevent an NSSA ABR from translating Type-7 LSAs into Type-5 LSAs, you configure the 'no-translate' option under the nssa statement.

Answer

set protocols ospf area 0.0.0.2 nssa suppress-translation

Answer

set protocols ospf area 0.0.0.2 nssa no-type-5-conversion

Answer

set protocols ospf area 0.0.0.2 nssa translator-role never