4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ50

Service fundamentals review

What action is taken when an Ethernet switch receives a frame with a known DA and an outer EtherType value of 0x0800 on a dot1q-encapsulated port?

  • A The frame will be forwarded out the port associated with the DA.
  • B The frame will be discarded.
  • C The frame will be flooded to all ports.
  • D The frame will be fragmented and forwarded out the port associated with the DA.
Explanation

A dot1q-encapsulated port expects ingress frames whose outer tag uses the configured dot1q EtherType; the standard 802.1Q TPID is 0x8100. 0x0800 denotes IPv4, not an outer VLAN tag, so the frame fails dot1q encapsulation validation and is discarded rather than forwarded based on its destination address.

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