4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ28

VPLS Features

Host 1’s MAC address has been learned on SAP 1/1/10:10 on PE-1. Host 2 transmits a broadcast Ethernet frame to PE-2 with Host 1’s MAC address as its source address. What action occurs?

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  • A PE-2 will discard the frame.
  • B PE-1 will re-learn the MAC on the SDP.
  • C PE-1 will discard the frame.
  • D PE-2 will be operationally down; auto-protect must be configured consistently across the service.
Explanation

auto-learn-mac-protect marks source MAC addresses learned on the configured SAP as protected. A frame using that protected source MAC and arriving through a different object violates source-MAC protection. Because PE-1’s spoke SDP 2:100 is configured with protected-src-mac-violation-action discard, PE-1 discards the received frame.

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