4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ113

VPLS Features

Refer to the exhibit below.

Question Image

CE-A transmits frames with two tags. If the SAP on PE-A is sap 1/1/1:1 .* and the SAP on PE-B is sap 1/1/1:100.200, how many tags will the frame have when it egresses the SAP on PE-B?

  • A 0
  • B 1
  • C 2
  • D 3
Explanation

For a QinQ SAP of 1.*, the explicit outer tag 1 is service-delimiting and is removed on ingress, while the wildcard inner tag remains transparent through the VPLS. An exact QinQ SAP of 100.200 pushes both tags 100 and 200 on egress. The transparent tag plus those two egress tags results in three tags.

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