Nokia Nokia Certifications 4A0-105 Questions & Answers

• Question 71:

  What configuration is required on the CE device when using MC-LAG?

  A. The CE must be configured with an MC-LAG to both PE devices.

  B. The CE must be configured with LACP in active mode.

  C. There is no configuration required on the CE.

  D. The CE must be an Alcatel-Lucent 7750 SR.

  Correct Answer: B

• Question 72:

  Why should you configure send-flush-on failure on your PE routers when using active/standby pseudowires?

  A. It flushes the local FDB speeding recovery

  B. It discards all packets in the queue and sends icmp-discad messages to the sender. The packets are re-transmitted resulting in no loss of data.

  C. On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This speeds convergence to the new topology.

  D. It is not important to use send-flush-on-failure as Active/Standby signalling automatically converges the FDB in all VPLS instances

  Correct Answer: C

• Question 73:

  The command "send flush-on-failure" has been enabled within a VPLS instance. What does the PE do upon detection of a SAP failure within the VPLS?

  A. The PE sends an LDP control message that flushes all FDB entries in the VPLS instance.

  B. The PE sends an LDP control message that flushes all FDB entries in the VPLS instance that are associated with the PE that detected the failure.

  C. The PE flushes it's local FDB only.

  D. The PE sends an oam service message that flushes all FDB entries in the VPLS instance.

  Correct Answer: B

• Question 74:

  Click on the exhibit below.

  

  You have been requested to add load balancing across the redundant spoke-SDPs in the network shown. What further configuration is required? (Choose 2)

  A. An additional management VPLS.

  B. Another set of LSPs between PE1 and PE3 and between PE2 and PE4.

  C. Another set of SDPs between PE1 and PE3 and between PE2 and PE4.

  D. Load balancing has to be enabled within the management VPLS.

  Correct Answer: AC

• Question 75:

  In RSTP, which state do all ports initialize in?

  A. Designated

  B. Discarding

  C. Listening

  D. Root

  E. Forwarding

  Correct Answer: B

• Question 76:

  Click on the exhibit below.

  

  Management VPLS 100 has been created for redundant spoke-SDP connections. User VPLSs 10 and 20 are using the same spoke-SDPs that are being managed by VPLS 100. Unexpected behavior has been reported. Based on the following output, what is the most likely reason for the unexpected behavior?

  A. VPLS 100 was not actually configured as a management VPLS.

  B. VPLS 10 and VPLS 20 are not actually configured as a user VPLS.

  C. VPLS 10 and VPLS 20 are not using the same spoke-sdps that the management VPLS is using.

  D. Based on the output there is now way of telling if there is a problem with the configuration.

  Correct Answer: A

• Question 77:

  Which of the following statements about Spanning Tree Protocol is true?

  A. The switch with the lowest priority becomes the root.

  B. The switch with the highest priority becomes the root.

  C. The switch with the lowest MAC address always becomes the root.

  D. The switch with the highest MAC address always becomes the root.

  Correct Answer: A

• Question 78:

  Click on the exhibit below.

  

  Which ports will become root ports? (Choose 3)

  A. Bridge B 1/1/3

  B. Bridge B 1/1/2

  C. Bridge C 1/1/2

  D. Bridge C 2/1/1

  E. Bridge D 1/1/1

  F. Bridge D 1/1/3

  G. Bridge E 1/1/1

  H. Bridge E 1/1/3

  Correct Answer: BDF

• Question 79:

  One of the shortcomings of Spanning Tree Protocol (STP) is that it computes a valid, but not necessarily optimal, path between nodes within a network.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 80:

  Why is it best practice to set the bridge priority in an STP network? (Choose 2)

  A. This is not a best practice. Any switch can be used as the root bridge.

  B. So that you know which links will be active in your network.

  C. To prevent a new switch from becoming root when added to the network.

  D. To allow all ports on the root switch to become alternate ports.

  Correct Answer: BC