Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 181:

  You have been asked to verify the state of an LDP-signaled Layer 2 circuit. Which two commands would you use to verify the state of the connection? (Choose two.)

  A. show mpls lsp

  B. show l2circuit connections

  C. show l2circuit statistics

  D. show ldp database

  Correct Answer: BD

• Question 182:

  You have configured MPLS and RSVP in your network using all of the Junos defaults. You have established an LSP in your network, which is reporting a status of "Up", but no traffic is using it. Which two statements reflect potential causes for this issue? (Choose two)

  A. The LSP egress address is a physical interface address

  B. family MPLS was omitted from the router configurations

  C. No BGP routes are being advertised from the remote neighbor

  D. The LSP egress address does not match the BGP next-hop address

  Correct Answer: CD

• Question 183:

  What are two characteristics of an interface that has been placed in the blocking state by STP? (Choose two.)

  A. It drops all data frames

  B. It listens to received BPDUs

  C. It uses learned MAC addresses to populate the MAC table

  D. It forwards outbound data frames only

  Correct Answer: AB

• Question 184:

  A root bridge in an RSTP network is connect to other neighboring bridge using point-to-point links. Which combination of port types can exist on the root bridge?

  A. A combination of designated ports and alternate ports

  B. A combination of root ports and alternate ports

  C. All ports are designated ports

  D. All ports are root ports

  Correct Answer: C

• Question 185:

  What are two ways to prevent Layer 2 loops in a network? (Choose two)

  A. BPDU protection

  B. LDP protection

  C. loop protection

  D. Layer 2 protection

  Correct Answer: AC

• Question 186:

  Which command enables STP on an MX Series device?

  A. set protocols rstp force-mode stp

  B. set protocols rstp mode stp

  C. set protocols rstp version stp

  D. set protocols rstp force-version stp

  Correct Answer: D

• Question 187:

  Click the Exhibit button.

  

  Based on the designated values show in the exhibit, which three statements are true? (Choose three.)

  A. Switch A will become the root bridge

  B. Both interfaces on Switch B will be in the forwarding state

  C. Switch C will become the root bridge

  D. Both interfaces on Switch A will be in the forwarding state

  E. Both interfaces on Switch C will be in the forwarding state

  Correct Answer: BCE

• Question 188:

  Which Operational mode command displays the root bridge ID for a Junos device?

  A. show spanning-tree root-id

  B. show spanning-tree bridge

  C. show spanning-tree bridge-id

  D. show spanning-tree root

  Correct Answer: B

• Question 189:

  You have built the core of your network using Spanning Tree Protocol. You must ensure that if one of the links between your core switches fails to receive BPDUs it does not mistakenly create a loop.

  Which feature would you use to ensure BPDUs are always received from neighboring switches to indicate that the remote switch is still alive?

  A. storm control

  B. BPDU control

  C. root protection

  D. loop protection

  Correct Answer: C

  Peer STP applications running on switch interfaces exchange a special type of frame called a bridge protocol data unit (BPDU). Switches communicate interface information using BPDUs to create a loop-free topology that ultimately determines the root bridge and which interfaces block or forward traffic in the spanning tree.

  However, a root port elected through this process has the possibility of being wrongly elected. A user bridge application running on a PC can generate BPDUs, too, and interfere with root port election.

  To prevent this from happening, enable root protection on interfaces that should not receive superior BPDUs from the root bridge and should not be elected as the root port.

  References: http://www.juniper.net/techpubs/en_US/junos15.1/topics/example/spanning-trees-rootprotection-ex-series.html

• Question 190:

  Click the Exhibit button.

  

  Referring to the exhibit, which route preference will be assigned to the route 172.24.0.0/20?

  A. 150

  B. 170

  C. 130

  D. 100

  Correct Answer: C

  If the route is learned through aggregate the default router preference is 130.

  Note: aggregate syntax:

  aggregate {

  defaults {

  ... aggregate-options ...

  }

  route destination-prefix {

  policy policy-name;

  ... aggregate-options ...

  }

  }

  References: http://www.juniper.net/documentation/en_US/junos15.1/topics/reference/general/routingprotocols-default-route-preference-values.html