ICND2: Interconnecting Cisco Networking Devices Part 2 (legacy) — Question 11

Which statement about QoS default behavior is true?

Answer options

• A. Ports are untrusted by default.
• B. VoIP traffic is passed without being tagged.
• C. Video traffic is passed with a well-known DSCP value of 46.
• D. Packets are classified internally with an environment.
• E. Packets that arrive with a tag are untagged at the edge of an administrative domain.

Correct answer: A

Explanation

The correct answer is A because, by default, ports do not trust incoming traffic, meaning they do not apply QoS policies until configured otherwise. Option B is incorrect as VoIP traffic can be tagged for prioritization, while option C inaccurately states the DSCP value for video traffic. Options D and E do not accurately reflect the default behavior of QoS regarding packet classification and tagging.