Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 141:

  You have been asked to provide three commands helpful in troubleshooting OSPF adjacencies.

  Which three commands would be helpful? (Choose three.)

  A. show ospf database

  B. show ospf summary

  C. show ospf interface

  D. show ospf adjacency

  E. show ospf neighbor

  Correct Answer: ACE

  show ospf database, interface, and neighbor would provide detailed information about the OSPF database, interfaces running OSPF, and information about the OSPF neighbors. show ospf summary only provides a high-level information, while show ospf adjacency does not exist.

• Question 142:

  Two Junos devices are trying to form an OSPF adjacency. When you issue the "show ospf neighbor" command, you see that one device is in the Loading state and the other is in the Full state. Why is one device in the Loading state?

  A. The device does not know about the received LSA header and has transmitted a link-state request

  B. The device has finished transmitting, but is still receiving database information

  C. The device is waiting for a start event

  D. The device has established bidirectional communication with its peer

  Correct Answer: B

  The Loading state indicates that a device has finished transmitting its database to its peer but is still receiving database information from the neighboring device.

• Question 143:

  Your OSPF network design uses stub areas extensively due to 5000 external routes within the backbone and resource constraints in the nonbackbone areas. You now have a device in Area 2 that must perform as an ASBR. Which OSPF area types should you use for Area 2?

  A. stub

  B. non-backbone area

  C. not-so-stubby-area

  D. totally stubby area

  Correct Answer: C

  An OSPF stub area has no external routes in it, so you cannot redistribute routes from another protocol into a stub area. A not-so-stubby-area (NSSA) allows external routes to be flooded within the area. These routes are then leaked into other areas. However, external routes from other areas still do not enter the NSSA. (ABR does not flood LSA types 4 and 5 into an attached NSSA.)

• Question 144:

  You have been asked to use an interior gateway protocol (IGP) to design your network. You have been told that your design should allow for fast reconvergence and scalability for future growth. Which IGP would accommodate these criteria?

  A. static routing

  B. Routing Information Protocol (RIP)

  C. Open Shortest Path First (OSPF)

  D. Border Gateway Protocol (BGP)

  Correct Answer: C

  Static routing is static and not a protocol. BGP is an EGP rather than an IGP. OSPF has a faster convergence due to its link-state architecture compared to RIP, which is a distance vector protocol.

• Question 145:

  R3 is an OSPF router connect to both Area 0 and Area 1. Area 1 has been configured as a stub area. Which two LSA types does R3 suppress from Area 1? (Choose two.)

  A. Router LSA

  B. External LSA

  C. Summary LSA

  D. ASBR Summary LSA

  Correct Answer: BD

  Stub areas are areas through which, or into which, AS external advertisements are not flooded (LSA types 4 and 5).

• Question 146:

  What is the purpose of the designated router in OSPF?

  A. to connect a stub area to the backbone area

  B. to connect a totally stub area to the backbone area

  C. to form adjacencies with other OSPF routers in a backbone area

  D. to form adjacencies with other OSPF routers in a broadcast domain

  Correct Answer: D

  It is the designated router's job to form an adjacency with all other OSPF routers on the link and to advertise the link-state information to the AS.

• Question 147:

  Your area boarder router (ABR) receives type 1, 2, and 5 link-state advertisements (LSAs) from a nonbackbone area. What would the ABR do with the information learned from the nonbackbone area?

  A. It will generate type 2 and 3 LSAs and flood type 5 LSAs to the backbone area

  B. It will generate only type 3 LSAs and flood only type 5 LSAs to the backbone area

  C. It will generate type 3 and 4 LSAs, and flood type 5 LSAs to the backbone area

  D. It will generate only type 4 LSAs and flood only type 5 LSAs to the backbone area

  Correct Answer: C

• Question 148:

  You are troubleshooting an adjacency formation problem in OSPF using traceoptions. Which command is used to view the output of a traceoptons file called trace-ospf?

  A. show log trace-ospf

  B. file show /log/trace-ospf

  C. monitor trace-ospf

  D. show system syslog

  Correct Answer: A

  The trace output (debug information) is directed to the named log file, which is stored in the /var/log directory. You can view the output as a log file using the "show log" command, or in real-time using the "monitor start" command

• Question 149:

  Which three statements about nonstop active routing (NSR) are correct? (Choose three.)

  A. NSR uses the graceful Routing Engine switchover infrastructure

  B. NSR and graceful restart work together to reduce downtime during a Routing Engine failure

  C. NSR preservers routing information and protocol sessions on both Routing Engines

  D. NSR requires that both Routing Engines run the same version of software

  E. NSR enables chassisd on both Routing Engines to allow for a smooth transition during a failure

  Correct Answer: ACD

  -

  NSR uses the graceful Routing Engine switchover infrastructure.

  -

  NSR preservers routing information and protocol sessions on both Routing Engines

  -

  NSR requires that both Routing Engines run the same version of software NSR and graceful restart cannot be configured or used together

• Question 150:

  What is a reason for an OSPF router to display a designated router ID of 0.0.0.0?

  A. The MTU is mismatched.

  B. The subnet mask is mismatched.

  C. The interface type is point-to-point.

  D. The interface type is broadcast.

  Correct Answer: C