Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 111:

  Which two statements are true about the BGP MED attribute? (Choose two.)

  A. It has a default value of 100

  B. It has an assumed value of 0

  C. It is designed for use when multiple connections exist between the same two autonomous systems

  D. It is designed for use when a BGP router is peering with at least two different autonomous systems

  Correct Answer: BC

  MED is used to help influence the preferred path back into the autonomous system when multiple links exist between the same two autonomous systems. BGP routes do not require the MED attribute. If it is missing, BGP assumes the MED value is 0.

• Question 112:

  What are three BGP attributes used in the route-selection process? (Choose three.)

  A. local preference

  B. communities

  C. MED

  D. origin

  E. atomic aggregate

  Correct Answer: ACD

  When a Junos device receives two similar route advertisements from different BGP peers, it will select the route will the lowest MED value. BGP route selection proceeds in this manner:

  Prefer the highest local-preference value

  Prefer the shortest AS-path length

  Prefer the lowest origin value

  Prefer the lowest MED value

  Prefer routes learned from an EBGP peer over an IBGP peer

  Prefer best exit from AS

  For EBGP-receive routes, prefer the current active route:

  otherwise, prefer routes from the peer with the lowest RID

  Prefer paths with the shortest cluster length

  Prefer routes from the peer with the lowest peer ID

• Question 113:

  You are logged in to an MX80 and issue the command "show route protocol bgp" You see that you have received the route 10.0.4/24 from two different peers. One peer is an external peer and the other is an internal peer. The route received from the internal peer is active.

  By the rules of BGP preference, what would cause the internal path for this prefix to be preferred over the external one?

  A. Internally learned prefix is preferred over an externally learned prefix

  B. The local-preference value of the internally learned prefix is higher than the externally learned peer

  C. The peer ID of the internally learned prefix is lower than that of the externally learned peer

  D. The internally learned prefix has a shorted cluster length

  Correct Answer: B

• Question 114:

  How are BGP routes grouped when being sent in an update message?

  A. by grouping aggregated address ranges together

  B. by using a complete set of matching attributes

  C. by the originating autonomous system

  D. by the originating router

  Correct Answer: B

• Question 115:

  Which two elements are valid in the BGP path selection algorithm? (Choose two.)

  A. lowest local preference value

  B. lowest multi-exit discriminator

  C. highest multi-exit discriminator D. highest local preference value

  Correct Answer: BD

  When a Junos device receives two similar route advertisements from different BGP peers, it will select the route will the lowest MED value. BGP route selection proceeds in this manner:

  Prefer the highest local-preference value

  Prefer the shortest AS-path length

  Prefer the lowest origin value

  Prefer the lowest MED value

  Prefer routes learned from an EBGP peer over an IBGP peer

  Prefer best exit from AS

  For EBGP-receive routes, prefer the current active route:

  otherwise, prefer routes from the peer with the lowest RID

  Prefer paths with the shortest cluster length

  Prefer routes from the peer with the lowest peer ID

• Question 116:

  Your Junos device receives two similar route advertisements from different BGP peers.

  What would cause a route to be selected in this scenario?

  A. having a lower MED value

  B. having a lower local preference

  C. learning a route from a peer with a higher peer ID

  D. learning a route from a peer with a higher IGP metric

  Correct Answer: A

  When a Junos device receives two similar route advertisements from different BGP peers, it will select the route will the lowest MED value. BGP route selection proceeds in this manner:

  Prefer the highest local-preference value

  Prefer the shortest AS-path length

  Prefer the lowest origin value

  Prefer the lowest MED value

  Prefer routes learned from an EBGP peer over an IBGP peer

  Prefer best exit from AS

  For EBGP-receive routes, prefer the current active route:

  otherwise, prefer routes from the peer with the lowest RID

  Prefer paths with the shortest cluster length

  Prefer routes from the peer with the lowest peer ID

• Question 117:

  You are logged into a Junos device and issue the command show route protocol bgp. You see that the device has received the route 10 0.4/24 from two different IBGP peers. Local preference, MED, origin, and AS-path values are equal.

  Which criterion is used to determine which path will be preferred?

  A. cluster length

  B. router ID (RID)

  C. peer ID

  D. IGP cost

  Correct Answer: B

  When a Junos device receives two similar route advertisements from different BGP peers, it will select the route will the lowest MED value. BGP route selection proceeds in this manner:

  Prefer the highest local-preference value

  Prefer the shortest AS-path length

  Prefer the lowest origin value

  Prefer the lowest MED value

  Prefer routes learned from an EBGP peer over an IBGP peer

  Prefer best exit from AS

  For EBGP-receive routes, prefer the current active route:

  otherwise, prefer routes from the peer with the lowest RID

  Prefer paths with the shortest cluster length

  Prefer routes from the peer with the lowest peer ID

• Question 118:

  Using industry best practices, which two BGP attributes would you modify to influence how traffic enters your network? (Choose two)

  A. AS Path

  B. Local Preference

  C. Next Hop

  D. MED

  Correct Answer: AD

  Based on industry best practices, you can use the BGP attributes AS-path (by prepending additional AS's into the outgoing BGP messages) and MED to influence how traffic enters your network.

• Question 119:

  

  In the exhibit Router A and Router B are operating on the LAN with Router B acting as the designated

  intermediate system (DIS).

  When Router C and Router D are added to the LAN. Which statement is true?

  A. Router C becomes the new DIS with no backup DIS.

  B. Router D becomes the new DIS with no backup DIS.

  C. Router C becomes the new DIS with Router B as the backup DIS.

  D. Router D becomes the new DIS with Router A as the backup DIS.

  Correct Answer: A

• Question 120:

  Which role does the router ID (RID) have in the BGP route selection process?

  A. The router ID is evaluated immediately after MED to determine route preference

  B. The router ID is evaluated last in the route selection process

  C. The router ID is evaluated after the cluster length and a lower router ID is chosen

  D. The router ID is evaluated after analyzing the IGP metric cost

  Correct Answer: C