4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ85

VPLS Features

Refer to the exhibit below.

Question Image

The SAP on PE-A is configured with dot1q encapsulation. The SAP on PE-B is configured with qinq encapsulation. CE-A transmits frames carrying a single tag of 100. The VLAN tag from CE-A must be carried transparently. CE-B expects a frame whose top tag is 200 and whose bottom tag is 100. Which of the following is the correct SAP ID for PE-B?

  • A sap 1/1/1:200.100
  • B sap 1/1/1:200*
  • C sap 1/1/1:*
  • D sap 1/1/1:0*
Explanation

A QinQ SAP identifies the outer tag as qtag1 and the inner tag as qtag2. Configuring outer tag 200 with a wildcard inner tag adds the required outer VLAN 200 while retaining the transparently carried VLAN 100 as the inner tag. Nokia documents QinQ SAP syntax as qtag1.qtag2 and supports an explicit outer tag with a wildcard inner tag.

Learn more

Community Discussion

No comments yet. Be the first to start the discussion!