During the configuration of L3VPNv4 over SRv6 BE, if an RR is deployed in the SR domain, which command must be run on the RR to ensure that the PEs at both ends can correctly learn VPNv4 routes?

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In addition to indicating priority, the DSCP value can also indicate the drop probability. Which of the following DSCP values is set with the highest drop probability?

• A.AF43
• B.AF10
• C.AF12
• D.AF11

Correct Answer: A

Understanding DSCP & Assured Forwarding (AF) Classes
* DSCP (Differentiated Services Code Point) is used for QoS (Quality of Service) classification in IP packet headers.
* Assured Forwarding (AF) classes provide four traffic classes (AF1x, AF2x, AF3x, AF4x).
* Each AF class has three drop precedence levels (Low = 1, Medium = 2, High = 3).
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Analysis of Options:
* AF43 (Answer A) # Class 4, High Drop (Highest priority, highest drop probability) #
* AF10 (Answer B) # Class 1, Low Drop (Lowest priority, lowest drop probability) #
* AF12 (Answer C) # Class 1, Medium Drop Probability #
* AF11 (Answer D) # Class 1, Low Drop Probability #
Why AF43?
* Highest priority traffic within AF Class 4.
* Highest drop probability (x3) means packets are dropped first under congestion.
* Used for premium but non-essential services (e.g., bulk data transfer, backups).
# Reference: Huawei HCIE-Datacom Guide - QoS & DSCP Marking

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The following description of the CHAP authentication function in the PPP protocol is correct?( Multiple choice questions).

• A.If the authenticator does not have a username configured, password
• B.The user name must be configured under the authenticated party interface for CHAP authentication
• C.is calculated using the MD5 algorithm Three message interactions are required for authentication, and only the user name is transmitted on the network without the password
• D.can also be configured without the authenticated party interface Using the authentication sequence ID, random number, and key, a Hash value

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What information does this contain in a basic layer packet? (Multiple choice)

• A.Network Layer Tail
• B.Data link layer header
• C.Upper-level data
• D.path records
• E.The network layer header

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Fill in Blank
The ingress VTEP performs both Layer 2 and Layer 3 table lookup for packet forwarding. The forwarding mode is _____ IRB forwarding. (Capitalize the first letter.)

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