4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ184

Introduction to Virtual Private LAN Services

Refer to the exhibit below.

Question Image

The following VPLS services and SAPs are configured. Which statement is true?

  • A All untagged frames will be dropped.
  • B The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated in VPLS 3.
  • C All frames with more than one tag will be dropped.
  • D The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.
  • E The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.
Explanation

On a dot1q SAP, a nonzero SAP encapsulation value is the VLAN ID used to identify the service. Traffic with an outer VLAN tag of 100 is therefore assigned to SAP 1/1/1:100 in VPLS 2, allowing the source MAC address to be learned there. A SAP value of 0 accepts untagged traffic rather than frames tagged with arbitrary VLAN IDs.

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