4A0-105 Online Practice Questions and Answers

Assuming TLDP and RSVP are both being used in an MPLS network core which of the following statements is true?

A. TLDP is used to create the inner label, RSVP is used to create the outer label.

B. TLDP is used to create the outer label, RSVP is used to create the inner label.

C. TLDP and RSVP cannot be used in the same network since they both provide the same label.

D. When RSVP is used, TLDP must be disabled and static vc labels should be used.

E. TLDP and RSVP can be used to create either labels based on how they are configured.

Port 1/1/1 has been configured as an access port with QinQ encapsulation. Which of the following three statements are true for ingress traffic assuming default configuration? (Choose 3)

A. sap 1/1/1:*.0 is a valid sap id.

B. sap 1/1/1:100* will accept frames with a single tag of 100.

C. sap 1/1/1:200* will strip the top tag of 200 and the bottom tag will be transparently passed.

D. sap 1/1/1:0* will accept all untagged frames.

E. sap 1/1/1:0* will accept any tagged frames.

What is the maximum number of VLANs supported on a traditional Layer 2 switch?

A. 4094

B. 8190

C. 32768

D. 131071

Which of the following statements regarding unicastand multicast frames is true for a traditional layer 2 switch? (Choose 2)

A. Multicast frames only forward out ports that have a known receiver.

B. Unicast frames only forward out ports that have a known receiver.

C. If the FDB is empty, unicast and multicast frames are treated equally.

D. If the FDB has an entry for the unicast frame, both unicastand multicast are treated equally.

Which of the following describes the overhead added to a customer frame on an Ethernet link in a VPLS service on the Alcatel-Lucent 7750 SR?

A. The overhead consists of 26 bytes. 14 DLC + 2 Ethertype + 8 for mpls labels + 2 for GRE

B. The overhead consists of 14 bytes for DLC.

C. The overhead consists of 18 bytes. 14 DLC +4 for mpls labels

D. The overhead consists of 22 bytes. 14 DLC + 8 for mpls labels

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

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. 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

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

Which of the following best describes the difference between VPWS and VPLS?

A. Unlike VPLS. VPWS appears as a multi-hop network to the customers.

B. Unlike VPLS, VPWS allows CEs that are member of the same service instance to communicate with each other as if they are connected via a bridged LAN.

C. Unlike VPWS, VPLS allows customers to view the network as a routed network.

D. Unlike VPWS, VPLS is a service where customer MAC addresses are learned.

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

A. Processing the TTL takes extra time.

B. MAC learning rate is doubled.

C. FDB size is doubled.

D. Requires a protocol to remove loops.

An MC-LAG is configured with default parameters. When a failed interface recovers, the active link reverts to the restored interface.

A. TRUE

B. FALSE