During a CEF packet rewrite, which of the following changes are NOT made to the packet?

Last Updated on August 1, 2021 by Admin 2

During a CEF packet rewrite, which of the following changes are NOT made to the packet?

  • The source MAC address is changed to the MAC address of the outbound Layer 3 switch interface.
  • The destination MAC address is changed to the MAC address of the next-hop router’s MAC address.
  • Layer 3 TTL is decremented by one.
  • Layer 2 TTL is decremented by one.
Explanation:

There is no Layer 2 TTL in the packet, so the Layer 2 time to live (TTL) cannot be decremented by one. All other options are correct. The following changes will be made when the Cisco Express Forwarding (CEF) packet rewrite process occurs:

  • The source MAC address is changed to the MAC address of the outbound Layer 3 switch interface.
  • The destination MAC address is changed to the MAC address of the next hop routers MAC address
  • The Layer 3 IP TTL is decremented by one
  • The Layer 3 IP checksum is recalculated
  • The Layer 2 frame checksum is recalculated

Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify switch administration

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