200-301 Cisco Certified Network Associate (CCNA)

A Cisco IP phone receives untagged data traffic from an attached PC. Which action is taken by the phone?

  • A. It drops the traffic.
  • B. It allows the traffic to pass through unchanged.
  • C. It tags the traffic with the native VLAN.
  • D. It tags the traffic with the default VLAN.
Answer: Option B.
Explanation: 

Section: Network Access
Untagged traffic from the device attached to the Cisco IP Phone passes through the phone unchanged, regardless of the trust state of the access port on the phone.
Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_40_se/configuration/guide/scg/swvoip.pdf

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