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Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q102-Q107):

NEW QUESTION # 102
How many bits are there in the label field of PLS?

A. 0
B. 1
C. 2
D. 3

Answer: C

NEW QUESTION # 103
On the OSPF network shown in the figure, R1 and R2 use OSPF to communicate with each other through Loopback0. In addition:
* MPLS LDP is enabled on R1 and R2.
* The LDP transport address is the IP address of Loopback0.
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?

Options:

A. R1's GE0/0/1 rejects packets with the destination IP address 10.0.2.2.
B. R1's GE0/0/1 rejects packets with UDP destination port 646.
C. R2's GE0/0/1 rejects packets with TCP destination port 646.
D. MPLS LDP is not enabled on R2's GE0/0/1.

Answer: C,D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS LDP (Label Distribution Protocol)
* LDP (Label Distribution Protocol) runs over TCP port 646.
* LDP uses the transport address (Loopback0 in this case) to establish TCP sessions between neighbors.
* For an LDP session to be established, both routers must:
* Enable LDP on the interface (GE0/0/1).
* Allow TCP traffic on port 646 (used for LDP adjacency formation).
2. Analyzing the Issue and Possible Causes
* The figure shows a successful ping from R2 to R1's Loopback0 (10.0.1.1/32).
* This means basic IP connectivity between R1 and R2 is working.
* OSPF is properly advertising Loopback0 addresses between the routers.
* The problem must be related to LDP itself, not general IP reachability.
3. Evaluating Each Answer Option
* Option A: "R1's GE0/0/1 rejects packets with the destination IP address 10.0.2.2."
* Incorrect.
* The ping test in the figure shows successful replies from 10.0.1.1 to 10.0.2.2, meaning packets to 10.0.2.2 are not being rejected.
* This is NOT the cause of the LDP failure.
* Option B: "MPLS LDP is not enabled on R2's GE0/0/1."
* Correct.
* If LDP is not enabled on R2's GE0/0/1, then R1 and R2 cannot form an LDP session.
* MPLS LDP must be enabled on both interfaces for label exchange.
* This is a valid cause of the issue.
* Option C: "R2's GE0/0/1 rejects packets with TCP destination port 646."
* Correct.
* LDP operates over TCP port 646, so if R2's GE0/0/1 has a firewall or ACL blocking TCP port 646, then LDP will fail.
* Blocking TCP 646 on R2's interface would prevent the session from establishing.
* This is another valid cause of the issue.
* Option D: "R1's GE0/0/1 rejects packets with UDP destination port 646."
* Incorrect.
* LDP does not use UDP; it uses TCP port 646.
* This is not a valid cause of the issue.
Final Answer:
# B and C are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS LDP Session Establishment and TCP 646 Dependency
* How OSPF Advertises Loopback0 for LDP Transport
* Common LDP Debugging Techniques and ACL Issues

NEW QUESTION # 104
As shown in the figure, Client1 and Client2 act as clients of RR1 and RR2 at the same time, and RR1 and RR2 are in the same In a Cluster, R introduces 10 routes. It is assumed that the configuration of B, CP is correct. Neighbor relations have been established Now, how many routing entries exist in the BGP routing table of Client2?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 105
If you want to check files under Flash, which command should use?

A. dir sd0:
B. dir sdl:
C. dir flash:
D. display patch-information

Answer: C

NEW QUESTION # 106
For the same MA, C address, manually configured MA, C entries have higher priority than automatically generated entries.

A. False
B. True

Answer: B

NEW QUESTION # 107
......

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