Free 4A0-105 Questions for Alcatel-Lucent Virtual Private LAN Services 4A0-105 Exam as PDF & Practice Test Engine

Exam Code/Number: 4A0-105
Exam Name/Title: Alcatel-Lucent Virtual Private LAN Services
Certification Provider: Alcatel-Lucent
Corresponding Certification: Alcatel-Lucent Certifications

Exam Questions: 156
Updated On: Oct 10, 2026

Question #1

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

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

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

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

Discussion 0

Correct Answer: C Vote an answer

Question #2

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 that are associated with the PE that detected the failure.

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

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.

Discussion 0

Correct Answer: A Vote an answer

Question #3

What is the MTU impact on the SDP path-mtu if fast reroute, one-to-one mode is implemented on the LSP?

A. The path-mtu will increase by 8 bytes.

B. The path-mtu will decrease by4 bytes.

C. The path-mtu will increase by 4 bytes.

D. The path-mtu will decrease by 8 bytes.

E. There will be no impact on the path-mtu.

Discussion 0

Correct Answer: E Vote an answer

Question #4

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 outthe port associated with the D

B. The frame will be flooded to all ports.

C. The frame will be fragmented and forwarded outthe port associated with the DA.

D. The frame will be discarded.

Discussion 0

Correct Answer: D Vote an answer

Question #5

Click on the exhibit below.

The following IP filter has been configured and applied to a SAP in a non-VPLS service. Which of the following statements is true?

A. All traffic matching entry 20 will be dropped.

B. Traffic matching entry 20 will be forwarded to sdp 100:1.

C. The filter entry will be ignored and traffic matching the criteria will be forwarded

D. An error will be generated and the configuration will not be allowed.

Discussion 0

Correct Answer: A Vote an answer

Question #6

Which of the following are required for an operational mesh-sdp binding for bidirectional traffic when signaling is enabled within the SDP?(Choose 3)

A. LDP must be enabled.

B. RSVP must be enabled.

C. Service MTU must match.

D. An SDP must be configured on the far-end.

E. SDP ID must match.

Discussion 0

Correct Answer: A,C,D Vote an answer

Question #7

Which of the following needs to be considered when designing Ethernet networks with redundancy?

A. MAC learning rate is doubled.

B. Processing the TTL takes extra time.

C. Requires a protocol to remove loops.

D. FDB size is doubled.

Discussion 0

Correct Answer: C Vote an answer

Question #8

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

A. 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.

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

D. It flushes the local FDB speeding recovery

Discussion 0

Correct Answer: A Vote an answer

Question #9

Which of the following is a true statement?

A. There is no relationship between the age-time and the fdb-table-size.

B. In a dynamic environment where MAC addresses are changing rapidly, the lower the age-time, the larger the fdb-table-size should be.

C. In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time, the larger the fdb-table-size should be.

D. In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time, the smaller the fdb-table-size should be.

Discussion 0

Correct Answer: C Vote an answer

Question #10

An l-VPLS can be associated with many B-VPLS services.

A. FALSE

B. TRUE

Discussion 0

Correct Answer: A Vote an answer

Question #11

What function in IEEE 802.1 ah helps to limit the amount of MAC addresses learned in the core?

A. I-VPLS is configured in the core of the network with an l-MAC address. This l-MAC address is the only MAC learned in the core

B. Each SDP is configured with a Backbone MAC to hide customer MAC addresses in the core

C. The B-VPLS and l-VPLS are configured in the edge. The B-VPLS is configured with a Backbone MAC and is the only MAC learned in the core

D. Each SAP is associated with a common l-MAC to hide customer MAC addresses in the core

Discussion 0

Correct Answer: C Vote an answer

Free 4A0-105 Questions for Alcatel-Lucent Virtual Private LAN Services 4A0-105 Exam as PDF & Practice Test Engine

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