4A0-105 Questions and Answers

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

sap 1/1/1

sap 1/1/1:0*

sap 1/1/1:0

sap 1/1/1:*

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.

Designated

Discarding

Listening

Root

Forwarding

The l-TAG in the l-SID is inspected to determine where the frame should be delivered.

When the B-MAC header is stripped the customer MAC address is then looked up in the FDB

The l-SID in the l-TAG is inspected to determine where the frame should be delivered.

The PE inspects the service label in the MPLS header before stripping the B-MAC header.

The port that the SAP belongs to must have the correct ether type configured.

The SAP must be configured with the right VLAN tag.

The SDP VC type must be configured as type VLAN and the correct vlan-vc-tag must be specified.

All of the above.

The 1-SID must be explicitly configured.

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

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

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

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

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

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

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

The frame is dropped.

The frame is always flooded

The frame is forwarded and MAC learning is automatically disabled.

The frame is discarded if the destination is unknown.

More information is required to determine the fate of this new frame.

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

On initialization and then every hello-interval.

Only after receiving LACP packets.

Every 1 second.

Never.

All untagged frames will be dropped.

The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated in VPLS 3.

All frames with more than one tag will be dropped.

The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.

The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.

RSVP-TE

SP-VLAN

QinQ

Dot1Q

H-VPLS

M-VPLS

PBB

MC-EP

SDP id

Service ID

VC Label

Tunnel Label

Customer id

802.1D2004

802.1D 1998

comp-dot1w

PVST

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.

Option A

Option B

Option C

Option D