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350-501 · Question #340
350-501 Question #340: Real Exam Question with Answer & Explanation
The correct answer is A: It remarks all values to a CoS of 0.. An untrusted interface at an administrative domain boundary typically handles incoming packets by remarking all existing QoS values, such as Class of Service (CoS), to a best-effort value like CoS 0.
Networking
Question
How does an untrusted interface at the boundary of an administrative domain handle incoming packets?
Options
- AIt remarks all values to a CoS of 0.
- BIt forwards only traffic with a DSCP value of 48.
- CIt translates the IP precedence value to the corresponding DSCP value.
- DIt drops all traffic ingressing the network.
Explanation
An untrusted interface at an administrative domain boundary typically handles incoming packets by remarking all existing QoS values, such as Class of Service (CoS), to a best-effort value like CoS 0.
Common mistakes.
- B. An untrusted interface would not forward only traffic with a specific high DSCP value; its purpose is to regulate all incoming traffic.
- C. While QoS systems can translate between IP Precedence and DSCP, the primary function of an untrusted interface is to reset or condition QoS markings, not just translate them.
- D. An untrusted interface is designed to receive and process traffic, not to drop all incoming packets; dropping all traffic would prevent any external communication.
Concept tested. Untrusted interface QoS behavior
Topics
#Untrusted Interface#QoS#Traffic Remarking#Network Boundary
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