Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 282

How does an untrusted interface at the boundary of an administrative domain handle incoming packets?

Answer options

• A. It remarks all values to a CoS of 0.
• B. It forwards only traffic with a DSCP value of 48.
• C. It translates the IP precedence value to the corresponding DSCP value.
• D. It drops all traffic ingressing the network.

Correct answer: A

Explanation

The correct answer is A because untrusted interfaces are designed to ensure that all incoming packets are treated with the lowest priority, hence they remark all values to a CoS of 0. Options B and C specify particular actions related to DSCP values that do not align with the behavior of untrusted interfaces, while option D suggests dropping all traffic, which is not the intended function in this scenario.