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In RSTP, how is the root bridge selected?

A.

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

B.

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

C.

The switch with the highest MAC address is selected as root

D.

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

Click on the exhibit below.

CE-A is on VLAN 200 and CE-B is on VLAN 300. Which of the following SAP ids can be configured on PE-A and PE-B to allow direct communication between CE-A and CE-B?

A.

PE-A will require a SAP id of "sap 1/1/1:200" and PE-B will require a SAP id of "sap 1/1/1:300.

B.

PE-A will require a SAP id of "sap 1/1/1" and PE-B will require a SAP id of "sap 1/1/1".

C.

PE-A will require a SAP id of "sap 1/1/1:0" and PE-B will require a SAP id of "sap 1/1/1:0".

D.

PE-A will require a SAP id of "sap 1/1/1:*" and PE-B will require a SAP id of "sap 1/1/1:*".

The service mtu of a VPLS is set to 9100. What is the recommended MTU value that can be set for the access port assuming dot1q encapsulation?

A.

9100

B.

9104

C.

9108

D.

9122

E.

9126

After the "disable-learning" command has been executed at the VPLS level, a new client device originates a frame. What is the result?

A.

If the MAC address of this new client device does not reach the upper limit of the configured total number of MAC addresses allowed in the VPLS forwarding database, then the new MAC address will be stored.

B.

The new source MAC addresses will not be entered in the VPLS service forwarding database.

C.

New local source MAC addresses will not be entered in the VPLS service forwarding database, but new remote MAC addresses would continue to be entered.

D.

New remote source MAC addresses will not be entered in the VPLS services forwarding database, but new local MAC addresses would continue to be entered.

What action will be taken when an MPLS router receives a frame with a label that does not exist in the LFIB?

A.

The frame will be flooded.

B.

The frame will be discarded.

C.

The frame will be fragmented.

The operation of a VPLS can be best described by which of the following statements?

A.

A frame should be sent to the PE that connects to the target site whenever possible.

B.

A frame should be flooded as little as possible.

C.

Customer frames should be switched based on the destination MAC address.

D.

All of the above.

E.

Only (a) and (b) are true.

Click on the exhibit below.

In the diagram below, SAP 1 is put into the blocking state as a result of the spanning tree protocol. What will occur in the VPLS instance if SAP 2 goes down and SAP 1 transitions to the forwarding state? Select the most accurate statement.

A.

A Spanning Tree BPDU will be sent across the mesh flushing the FDB table in all devices participating in the VPLS instance.

B.

Stale information will be used within the VPLS instance to forward traffic until the FDB ages out.

C.

An LDP control message will be sent to all devices in the mesh participating in the VPLS instance. Only MAC addresses associated with the PE that the failure occurred on will be flushed.

D.

An LDP control message will be sent to all devices in the mesh participating in the VPLS instance. The entire FDB in the VPLS instance will be flushed.

A LAG is configured with LACP passive mode enabled. When will LACP packets be sent?

A.

On initialization and then every hello-interval.

B.

Only after receiving LACP packets.

C.

Every 1 second.

D.

Never.

In IEEE 802.1ag, which two key functions are configured on bridge ports (SAPs and SDPs) to support CFM messages? (Choose 2)

A.

MEP

B.

MAP

C.

MIP

D.

MUP

Which of the following is a true statement?

A.

The lower the age-time, the greater the amount of flooding

B.

The higher the age-time, the greater the amount of flooding.

C.

The lower the age-time, the lower the amount of flooding.

D.

There is no relationship between the age-time and the amount of flooding.