Nokia Nokia Certifications 4A0-105 Questions & Answers

• Question 31:

  What action will be taken when an Ethernet switch receives a frame with a known DA and an outer Ethertype value of 0x0800 on a dot1q encapsulated port?

  A. The frame will be forwarded out the port associated with the DA.

  B. The frame will be discarded.

  C. The frame will be flooded to all ports.

  D. The frame will be fragmented and forwarded out the port associated with the DA.

  Correct Answer: B

• Question 32:

  Which failure scenario is NOT supported by IEEE 802.lag?

  A. Loss of connectivity.

  B. Unidirectional Loss.

  C. Loop detection.

  D. Merged Services.

  E. End-to-end bit error rates.

  Correct Answer: E

• Question 33:

  In IEEE 802.1ag, how are loops detected?

  A. Spanning-tree BPDUs are returned to the sender.

  B. The MEP sees its own CFM frames returned to itself.

  C. This is not a function of IEEE 802.lag but of 802.1D

  D. The record field of the CFM frame keeps track of chassis-mac addresses.

  Correct Answer: B

• Question 34:

  IEEE 802.3ah frames must be untagged.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 35:

  Which of the following are true when ports are configured with the IEEE 802.3ah Loopback Control feature? (Choose 3)

  A. The loopback control PDU instructs the remote port to enter loopback mode.

  B. Putting a port in loopback does not affect customer data flow

  C. Both ports must rediscover the OAM capabilities of each other once the port is put back into service.

  D. Both ports must still send Information PDUs to avoid going back to discovery mode.

  E. When a port is in loopback mode, service mirroring will still work if it is a mirror-source or mirror-destination.

  F. All packets, except for information PDUs, are looped back.

  Correct Answer: ADF

• Question 36:

  An l-VPLS is configured with a service id of 511. What will the value of the l-SID be assuming a default configuration?

  A. The 1-SID must be explicitly configured.

  B. The 1-SID only supports a range from 1 to 255.

  C. The 1-SID will default to 511 .the value of the service-id.

  D. Thel"SIDwilldefaultto131582, the value of the service-id + 131071.

  Correct Answer: C

• Question 37:

  H-VPLS solves the data-plane and control-plane problems with the exception of one issue. What is the concern that H-VPLS does not solve?

  A. Increased LSP count.

  B. Number of TLDP sessions.

  C. The amount of network touches.

  D. FDB consumption.

  E. Increased bandwidth and replication.

  Correct Answer: D

• Question 38:

  What of the following is a key benefit of Active/Standby pseudowires?

  A. The MDU does not need to support MPLS.

  B. Can be used in ring networks of 4 or more nodes

  C. Does not require the use of a layer 2 loop prevention protocol such as RSTP

  D. The MDU does not have to be aware of the active/standby configuration

  Correct Answer: C

• Question 39:

  Click on the exhibit below.

  

  Assuming there is a full mesh of mesh-SDPs between the PEs within each metro network and a spoke-SDP between PE-C of Metro A and PE-B of Metro B. how is traffic forwarded from PE-A in Metro A to PED of Metro B? Select the most accurate statement.

  A. An LSP must be configured between PE-A and PE-D for this traffic to be forwarded.

  B. A VPLS FDB lookup is done at PE-A of Metro A only

  C. An SDP must be configured between PE-A of Metro A and PE-D of Metro D for this traffic to be forwarded

  D. A VPLS FDB lookup is done at PE-A and PE-C of Metro A and PE-B of Metro B

  Correct Answer: D

• Question 40:

  What must be enabled in order to prevent a loop within a LAG?

  A. RSTP

  B. Dynamic-cost

  C. LACP active

  D. Nothing, There are no loops in LAGs

  Correct Answer: C