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2.13.2. Frame Switching Methods

MethodDescriptionLatencyError Detection
Store-and-forwardReceive entire frame, check FCS, then forwardHighestYes
Cut-through (Cisco: fast-forward)Forward after reading destination MAC (first 6 bytes)LowestNo
Fragment-freeForward after 64 bytes (minimum frame size)MediumPartial (collision)

⚠️ Exam Trap: Cisco switches default to store-and-forward. Cut-through provides lower latency but can forward bad frames.

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Alvin Varughese
Written byAlvin Varughese
Founder•20 professional certifications