4A0-105 Nokia Virtual Private LAN Services Questions and Answers

MEP

MAP

MIP

MUP

TRUE

FALSE

On initialization and then every hello-interval.

Only after receiving LACP packets.

Every 1 second.

Never.

The receiving PE checks the l-TAG in the l-SID to determine if there is a local l-VPLS on the node.

The receiving PE checks the l-SID in the l-TAG to determine if there is a local l-VPLS on the node.

The receiving PE checks the service label in the mpls header to determine if there is a local l-VPLS on the node.

The receiving PE checks the multicast B-DA to see if an l-SID has been mapped to the B-DA that matches a local l-VPLS on the node.

Bridge B 1/1/3

Bridge B 1/1/2

Bridge C 1/1/2

Bridge C 2/1/1

Bridge D 1/1/1

Bridge D 1/1/3

Bridge E 1/1/1

The frame will be flooded.

The frame will be discarded.

The frame will be fragmented.

The sdp id is different on the far-end.

LDP is disabled on the far-end.

The vc-id is different on the far-end.

The mesh-sdp is missing on the far-end.

The mesh-sdp is administratively shutdown on PEL

There is an MTU mismatch.

An additional management VPLS.

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

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

Load balancing has to be enabled within the management VPLS.

This cannot be done.

Each VPLS will use the same pair of SDP's with the same endpoint configured with the option "load-balancing 2".

Each VPLS will need their own pair of spoke-SDP's configured. The spoke-sdp's that are to be active should be configured with the option "precedence primary".

Under the end-point configuration, enable load-balancing 2 and the MDU will load balance automatically.

It flushes the local FDB speeding recovery

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.

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.

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

The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.

If the FDB reaches the limit, the router will discard frames.

Discarding frames when the FDB limit is reached could deny SLA guarantees.

It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.

TRUE

FALSE

Spoke SDP

Mesh SDP

Either (a) or (b) will make this sentence true.

Neither (a) nor (b) will make this sentence true.

The switch with the highest bridge-id is selected as root.

The switch with the lowest bridge-id is selected as root.

The switch with the highest MAC address is selected as root

The switch with the lowest MAC address is selected as root.

TRUE

FALSE

For the switches that are non-root or designated switches, the port with the highest combined cost to the root is the root port.

In the case where two switches have the same priority, the switch with the lowest MAC address becomes the root.

The switch port that is the greatest distance from the LAN to the root is the designated port.

All of the above.

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

The CE must be configured with LACP in active mode.

There is no configuration required on the CE.

The CE must be an Nokia 7750 SR.

9000

1514

1000

100

Spanning tree must be enabled within the VPLS.

Spanning tree BPDUs must be untagged.

Spanning tree BPDUs must be tagged.

Spanning tree must be disabled within the VPLS.

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

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

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

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