Free Access Huawei.H12-831_V1.0.v2026-05-29.q126 Practice Test (Page 16)

Question 71

Which of the following functions will affect the establishment of BGP neighbors? (Multiple choice)

A.BGP GSTM

B.ebgp max hop

C.BGP route filtering

D.BGP authentication

Question 72

There are three routers in an OSPFv3 network. The LSDB shown in the figure is seen on one of the routers.

Determine the role of the router based on its Router ID.

Question 73

On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command. R3 is configured with the peer y.y.y.y as-path-filter 1 import command for all peers. Which of the following sets of commands enables R3 to select the route with the longest AS_Path to 192.168.1.0/24?

A.ip as-path-filter 1 deny 65001s ip as-path-filter 1 permit .*

B.jp as-path-filter 1 deny .*6500 ip as-path-filter 1 permit .*

C.ip as-path-filter 1 deny A65002 ip as-path-filter 1 deny A65005 ip as-path-filter 1 permit .*

D.ip as-path-filter 1 permit .* ip as-path-filter 1 deny 65001s ip as-path-filter 1 deny A65005

Question 74

OSPF supports equal-cost load balancing. When the number of equal-cost routes in the network is greater than the number of equal-cost routes configured by the maximum load-balancing command, if the routes have the same priority, load balancing selects the route with a larger interface index.

A.False

B.True

Question 75

On the network shown in the figure, an administrator first completes the routing configuration and then enables MPLS and LDP on R1, R2, and R3 and their interconnected interfaces. In this manner, traffic from PC1 to PC2 can be forwarded based on MPLS. Which of the following routing configurations can implement this function?

Options:

A.nginx
CopyEdit
R1
ospf 1
area 0
network 1.1.1.1 0.0.0.0
network 10.1.12.0 0.0.0.255
network 10.1.1.0 0.0.0.255
R2
ospf 1
area 0
network 2.2.2.2 0.0.0.0
network 10.1.12.0 0.0.0.255
network 10.1.23.0 0.0.0.255
R3
ospf 1
area 0
network 3.3.3.3 0.0.0.0
network 10.1.23.0 0.0.0.255
network 10.3.3.0 0.0.0.255

B.nginx
CopyEdit
R1
bgp 65000
router-id 1.1.1.1
peer 3.3.3.3 as-number 65000
peer 3.3.3.3 connect-interface LoopBack 0
network 10.1.1.0 24
R3
bgp 65000
router-id 3.3.3.3
peer 1.1.1.1 as-number 65000
peer 1.1.1.1 connect-interface LoopBack 0
network 10.3.3.0 24

C.nginx
CopyEdit
R2
ospf 1
area 0
network 2.2.2.2 0.0.0.0
network 10.1.12.0 0.0.0.255
network 10.1.23.0 0.0.0.255
R3
ospf 1
area 0
network 3.3.3.3 0.0.0.0
network 10.1.23.0 0.0.0.255
bgp 65000
router-id 3.3.3.3
peer 1.1.1.1 as-number 65000
peer 1.1.1.1 connect-interface LoopBack 0
network 10.3.3.0 24
ip ip-prefix 1 index 10 permit 10.1.1.0 24
route recursive-lookup tunnel ip-prefix 1

D.nginx
CopyEdit
R1
ospf 1
area 0
network 1.1.1.1 0.0.0.0
network 10.1.12.0 0.0.0.255
R2
ospf 1
area 0
network 2.2.2.2 0.0.0.0
network 10.1.12.0 0.0.0.255
network 10.1.23.0 0.0.0.255
R3
ospf 1
area 0
network 3.3.3.3 0.0.0.0
network 10.1.23.0 0.0.0.255

Correct Answer: A

Comprehensive and Detailed In-Depth Explanation:
This question is based on MPLS (Multiprotocol Label Switching) and its interaction with routing protocols
. The goal is to ensure PC1 (10.1.1.1) can communicate with PC2 (10.3.3.1) over MPLS. Let's analyze each option carefully.
1## Understanding MPLS Routing Requirements
To forward traffic using MPLS and LDP, we need:
* An IGP (Interior Gateway Protocol) like OSPF or IS-IS to advertise network reachability.
* Loopback interfaces advertised in OSPF to establish LDP neighbor relationships.
* Consistent MPLS LDP enablement on all links in the MPLS domain.
* End-to-end IP reachability between loopbacks (since LDP uses the loopback for label distribution).
2## Option A (Correct Answer) Analysis
This configuration enables OSPF on all routers (R1, R2, and R3) across the MPLS domain:
# All networks are advertised in OSPF area 0, ensuring IP reachability.# Loopback interfaces (1.1.1.1,
2.2.2.2, 3.3.3.3) are included, which is required for MPLS LDP peer establishment.# PC1's network (10.1.1.0/24) and PC2's network (10.3.3.0/24) are properly advertised, ensuring end-to-end connectivity.# R1, R2, and R3 have OSPF neighbor relationships, meaning LDP can use OSPF routes for label switching.
# Conclusion: Option A meets all MPLS forwarding requirements and is the correct answer.
3## Why Other Options Are Incorrect
# Option B (Incorrect)
* Uses BGP instead of OSPF, which is not optimal for MPLS forwarding in a simple MPLS domain.
* LDP requires an IGP like OSPF or IS-IS to work efficiently.
* BGP alone does not establish LDP label bindings between R1, R2, and R3.
# Option C (Incorrect)
* Mixes OSPF and BGP, causing routing inconsistency.
* Uses ip ip-prefix and recursive lookup, which is unnecessary in a standard MPLS domain.
* BGP does not distribute labels dynamically like an IGP with LDP.
# Option D (Incorrect)
* R1 does not advertise the 10.1.1.0/24 network, meaning PC1's network is not reachable.
* R3 does not advertise the 10.3.3.0/24 network, meaning PC2's network is not reachable.
* Missing essential routing entries for full end-to-end reachability.
References:
# HCIP-Datacom Advanced Routing & Switching Technology# Huawei Official MPLS and LDP Configuration Guide# Huawei Enterprise Networking Documentation

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Question 71

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Question 73

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Question 75

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