Free Access Huawei.H12-831_V1.0-ENU.v2026-01-17.q104 Practice Test (Page 15)

Question 66

The router ID of OSPF V3 needs to be configured in dotted decimal with a length of 128 bits.

A.True

B.False

Question 67

MPLS is called multi-protocol label switching. Which description is correct about the label in MPLS? (Multiple choice)

A.MPLS supports single-layer labels as well as multi-layer labels

B.MPLS system has a variety of label publishing protocols, such as LDP is a label publishing protocol

C.A label is an identifier with a fixed length and only local meaning, which is used to uniquely identify the FEC to which a group belongs

D.The label is carried by the header of the MIPLS message and has a global meaning, that is, the label value of all routers cannot be repeated

Question 68

As shown in the figure, Client1 and Client2 act as clients of RR1 and RR2 at the same time, RR1 and RR2 are in the same Cluster, and R has introduced 10 routes. Assume that the BCP configuration is correct.

The neighbor relationship has been established. How many routing entries are there in the BGP routing table of Client2 ultimately?

A.20

B.10

C.15

D.0

Question 69

According to this figure, it can be known that in VLAN 300, from 17:22:38 to 17:22.44,00e0-fc3d-3bdB. 0 MA, C flaps occurred on 2020-06-04.

A.300

B.1

C.5

D.65535

Question 70

As shown in the figure, R1 to R4 are four routers in AS123. They all run OSPF to implement route reachability within the AS.
* Network segments 10.1.1.0/24 and 10.4.4.0/24 are not advertised into OSPF.
* R1 and R4 establish an IBGP peer relationship using Loopback0 and advertise network segments
10.1.1.0/24 and 10.4.4.0/24 into BGP.
Which of the following methods can be used to implement communication between PC1 and PC2?

Options:

A.Deploy policy-based routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2.

B.Deploy MPLS and LDP on R1 to R4 and establish LSPs for routes 1.1.1.1/32 and 4.4.4.4/32.

C.Run BGP on R2 and R3, and establish full-mesh IBGP connections in AS 123.

D.On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF.

Correct Answer: C,D

Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Routing Issue
* R1 and R4 are BGP routers and have an IBGP connection.
* R2 and R3 are OSPF-only routers (they do not run BGP).
* Networks 10.1.1.0/24 and 10.4.4.0/24 are advertised into BGP but not OSPF.
* PC1 (10.1.1.1) and PC2 (10.4.4.1) need communication, but their networks are not known to OSPF routers R2 and R3.
To fix this, we need a method that ensures R2 and R3 learn the routes for 10.1.1.0/24 and 10.4.4.0/24.
2. Evaluating Each Answer Option
* Option A: "Deploy policy-based routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2."
* Incorrect.
* Policy-Based Routing (PBR) does not solve the issue of missing routes in OSPF.
* Even if R1 forwards traffic to R2, R2 does not know how to reach 10.4.4.0/24, causing packet drops.
* A proper routing protocol solution is required instead of PBR.
* Option B: "Deploy MPLS and LDP on R1 to R4 and establish LSPs for routes 1.1.1.1/32 and
4.4.4.4/32."
* Incorrect.
* MPLS requires label-switched paths (LSPs) but does not distribute routing information itself.
* The real problem is that R2 and R3 do not have routing entries for 10.1.1.0/24 and 10.4.4.0/24.
* MPLS does not fix the missing route advertisement issue.
* Option C: "Run BGP on R2 and R3, and establish full-mesh IBGP connections in AS 123."
* Correct.
* If R2 and R3 run BGP, they can form IBGP sessions with R1 and R4 and learn routes 10.1.1.0
/24 and 10.4.4.0/24 via BGP.
* R2 and R3 would then be able to forward traffic correctly between PC1 and PC2.
* This is a valid method to fix the issue.
* Option D: "On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF."
* Correct.
* By redistributing BGP routes into OSPF, R1 and R4 can ensure that R2 and R3 learn the missing networks (10.1.1.0/24 and 10.4.4.0/24) via OSPF.
* This allows full reachability without running BGP on R2 and R3.
* This is another valid method to fix the issue.
Final Answer:
# C and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* BGP and OSPF Route Redistribution
* IBGP Full-Mesh Requirement and Route Propagation
* How Policy-Based Routing Works and Its Limitations

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Question 66

Question 67

Question 68

Question 69

Question 70

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