200-301 · Question #1302
How does frame switching function on a switch?
The correct answer is C. forwards known destinations to the destination port. A Layer 2 switch learns MAC addresses from incoming frames and stores them in its MAC address table, then forwards subsequent frames with known destination MAC addresses only out the specific port associated with that MAC. This ensures efficient, directed delivery of frames.
Question
How does frame switching function on a switch?
Options
- Arewrites the source and destination MAC address
- Bforwards frames to a neighbor port using CDP
- Cforwards known destinations to the destination port
- Dis disabled by default on all interfaces and VLANs
How the community answered
(43 responses)- A5% (2)
- B2% (1)
- C91% (39)
- D2% (1)
Why each option
A Layer 2 switch learns MAC addresses from incoming frames and stores them in its MAC address table, then forwards subsequent frames with known destination MAC addresses only out the specific port associated with that MAC. This ensures efficient, directed delivery of frames.
A Layer 2 switch does not rewrite the source and destination MAC addresses in a frame; that action is typically associated with Layer 3 routing or Network Address Translation (NAT).
CDP (Cisco Discovery Protocol) is a proprietary protocol used for neighbor discovery and information exchange, not for forwarding data frames based on MAC addresses.
Frame switching on a Layer 2 switch involves examining the destination MAC address of an incoming Ethernet frame. The switch then consults its MAC address table (CAM table) to find the port associated with that destination MAC address. If the destination is known, the switch forwards the frame only out the specific destination port, providing efficient and targeted communication.
Frame switching is a fundamental function of a Layer 2 switch and is enabled by default on all interfaces and VLANs to facilitate local network communication.
Concept tested: Layer 2 switch frame forwarding
Source: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/prod_white_paper0900aecd80404068.html
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