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200-301 · Question #1525

What is a characteristics of frame switching?

The correct answer is A. floods unknown destinations to all ports except the receiving port. Frame switching involves learning MAC addresses and forwarding frames to known destinations, but for unknown destinations, it floods the frame out all ports in the same VLAN except the receiving port.

Submitted by dimitri_ru· Mar 5, 2026Network Fundamentals

Question

What is a characteristics of frame switching?

Options

  • Afloods unknown destinations to all ports except the receiving port
  • Binspects and drops frames from unknown destinations
  • Cforwards frames to a neighbor port using CDP
  • Dprotects against denial of service attacks

How the community answered

(42 responses)
  • A
    95% (40)
  • B
    2% (1)
  • D
    2% (1)

Why each option

Frame switching involves learning MAC addresses and forwarding frames to known destinations, but for unknown destinations, it floods the frame out all ports in the same VLAN except the receiving port.

Afloods unknown destinations to all ports except the receiving portCorrect

When a switch receives a frame destined for a MAC address not present in its MAC address table, it floods the frame out all ports in the same VLAN, excluding the port it was received on, to ensure delivery and learn the destination's location.

Binspects and drops frames from unknown destinations

Switches do not inspect and drop frames from unknown destinations; instead, they flood them to facilitate learning the destination's MAC address and port association.

Cforwards frames to a neighbor port using CDP

CDP (Cisco Discovery Protocol) is a Layer 2 protocol used for neighbor discovery and information exchange, not for forwarding data frames based on destination MAC addresses.

Dprotects against denial of service attacks

Basic frame switching itself does not inherently protect against denial-of-service attacks; dedicated security features like port security or access control lists would be required for such protection.

Concept tested: MAC address table lookup and frame forwarding

Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet-switches/10577-6.html

Topics

#Ethernet switching#MAC address learning#Unknown unicast flooding#Layer 2 forwarding

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