H12-891_V1-0 practice question 30 of 35

Router A has an IP route entry with a purposeful CIDR block of 10001/32 and an outgoing interface of GigabitEthernetO/0/1. Now add the following…

Router A has an IP route entry with a purposeful CIDR block of 10001/32 and an outgoing interface of GigabitEthernetO/0/1. Now add the following configuration: acd number 2000 rule 10 permit source1001.10#traffic classifier test if-match acl 2000 # traffic behavior test remarkdscp cs3#traffic policy test classifier test behavior test# interfaceGigabitftherneto/0/1 ip address 1001212552552550 traffic-policy test outbound#assuming router A received a destination IP of 10001 Of packets, the following statements are correct:

Answer options

A. If the data packet source lIP address is 1001.2, it can be forwarded with the DSCP field marked CS3

B. If the packet source IP address is 1001.1, it can be forwarded while the DSCP field is marked as CS3

Correct answer

C. If the packet source IP address is 1001.2, it cannot be forwarded

D. If the packet source IP address is 1001.2, it can be forwarded while the DSCP field remains unchanged

Correct answer

Correct Answer:

B. B. If the packet source IP address is 1001.1, it can be forwarded while the DSCP field is marked as CS3; D. D. If the packet source IP address is 1001.2, it can be forwarded while the DSCP field remains unchanged

Explanation

The configuration applies a traffic policy outbound on interface GigabitEthernet0/0/1. This policy uses ACL 2000 to classify traffic. ACL 2000 specifically matches packets with a source IP address of 10.0.1.1. For a packet with source 10.0.1.1 (Option B), it matches the classifier, and the corresponding behavior remarks its DSCP field to CS3 before it is forwarded. For a packet with source 10.0.1.2 (Options A, C, D), it does not match the classifier. The default action for non-matching traffic in a policy is to permit it without modification. Therefore, the packet is forwarded with its DSCP field unchanged.

Why Incorrect

A. The packet with source 10.0.1.2 does not match ACL 2000, so its DSCP value will not be remarked to CS3.
C. The packet with source 10.0.1.2 does not match the policy's classifier, so it is forwarded by default; it is not dropped.

References

1. Huawei Enterprise Networking Documentation, "HedEx V200R001C00, QoS Configuration Guide". Section: "MQC Configuration". This section explains that traffic not matching any classifier in a traffic policy is forwarded by default.

2. Huawei Enterprise Networking Documentation, "HedEx V200R001C00, Command Reference". Section: "traffic policy". The documentation for this command details how traffic policies are applied and the behavior for non-matching traffic.

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