Huawei H12-831_V1.0 Exam Questions Instant Access

Question 1

On the OSPFv3 network shown in the figure, OSPFv3 is enabled on the interfaces connecting R1, R2, and R3. The router ID of each router is 10.0.X.X, where X is the number of the router.

If you check detailed information about an LSA on R3, the command output shows that R1 and R2 are DRs on the network.

Options:

ATRUE

BFALSE

Answer : B

Comprehensive and Detailed In-Depth

1. Understanding OSPFv3 and DR/BDR Election

In OSPFv3, on broadcast and non-broadcast networks, routers elect a Designated Router (DR) and a Backup Designated Router (BDR) to reduce LSA flooding.

The DR is responsible for generating Network LSAs (Type 2 LSAs) for the subnet.

The BDR takes over if the DR fails.

Other routers (DROther) only form adjacencies with the DR and BDR but still receive LSAs.

2. Understanding the LSA Output in the Figure

The LSA shown in the figure is a Type 1 (Router LSA).

The originating router is R2 (Router ID: 10.0.2.2).

The LSA lists two 'Transit Network' links connected to R2.

The Neighbor Router IDs listed are 10.0.1.1 (R1) and 10.0.2.2 (R2).

3. Why the Statement is FALSE

A transit network (broadcast network) should have only ONE DR.

R1 and R2 both being DRs is incorrect, as only one DR per subnet should exist.

The presence of two 'Transit Network' entries in the LSA suggests that there are two separate OSPF broadcast networks, each with its own DR.

This means R1 and R2 are each DRs on separate networks, but not both DRs on the same network.

Final Answer:

Answe r: B (FALSE)

HCIP-Datacom-Advanced Routing & Switching Technology Reference:

OSPFv3 DR/BDR Election Process

OSPFv3 LSA Types and Their Roles

OSPFv3 Network Topology and LSA Interpretation

Question 2

On a BGP/MPLS IP VPN network, VPNv4 routes carry the export RT. Which of the following attributes is used by MP-BGP to carry the export RT?

AExtended_Community
MP_REACH_NLRI

CLocal_Preference

DAS Path

Answer : A

Question 3

A network engineer checks LLDP neighbor information on R1. The output is shown below.

Which of the following statements are true?

LLDP Output:

yaml

CopyEdit

display lldp neighbor interface GE0/0/0

------------------------------------------------

GE0/0/0 has 1 neighbor(s):

Neighbor index: 1

Chassis type: MAC Address

Chassis ID: faed-ad04-0010

Port ID subtype: Interface Name

Port ID: GE0/0/0

System name: R2

System description: Huawei YunShan OS

HUAWEI AR8140-12G10XG

System capabilities supported: bridge router

System capabilities enabled: bridge router

Management address type: IPv4

Management address: 192.168.1.1

Expired time: 107s

AThe sysname of the peer device is R2.

BThe interface number of the peer device is GE0/0/0.

CThe VLAN ID of the peer device is 1.

DThe management IP address of the peer device is 192.168.1.1.

Answer : A, B, D

Comprehensive and Detailed In-Depth

The Link Layer Discovery Protocol (LLDP) is used for discovering neighboring devices. The given LLDP output contains key details about the neighboring device (R2), including its system name, interface, and management IP address. Let's analyze each option carefully:

Option A: 'The sysname of the peer device is R2.' Correct

The output clearly shows System name: R2, which confirms that the neighbor's system name is indeed R2.

Option B: 'The interface number of the peer device is GE0/0/0.' Correct

The Port ID in the LLDP output is GE0/0/0, which matches the statement in Option B.

Option C: 'The VLAN ID of the peer device is 1.' Incorrect

The given LLDP output does not mention any VLAN ID information. Therefore, this option is false.

Option D: 'The management IP address of the peer device is 192.168.1.1.' Correct

The Management address field in the LLDP output confirms the IP address as 192.168.1.1, making this statement true.

HCIP-Datacom-Advanced Routing & Switching Technology Reference:

Huawei HCIP-Datacom Official Certification Guide, Chapter on LLDP and Network Device Discovery.

HCIA/HCIP Datacom Training Materials -- LLDP Neighbor Discovery Commands.

Huawei Datacom Configuration Guide -- Section on display lldp neighbor interface.

Question 4

On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. 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. By default, in the routing table of R3, which of the following is the AS_Path attribute carried in the route to 192.168.1.0/24?

A65002, 65001

B65002, 65005, 65004

C65006, 65005, 65004

D65006, 65005, 65004, 65001

Answer : C

Question 5

On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers.

The IPv6 address of Loopback0 on R4 is 2000::4/128.

The command ipv6 summary 2000::/64 level-1-2 is configured in the IS-IS process of R4.

Which of the following statements is false?

A. The routing table of R1 contains the route 2000::4/128. B. The routing table of R3 contains the route 2000::/64. C. The routing table of R2 contains the route 2000::/64. D. The routing table of R5 does not contain the route 2000::/64.

AThe routing table of R1 contains the route 2000::4/128. (True)
R1 is a Level-1-2 router in the same area (49.0001) as R4, so it receives both the summarized 2000::/64 route and the more specific 2000::4/128 route.
Since R1 is directly connected to R4, it can still learn the 2000::4/128 route.
Statement A is true.

BThe routing table of R3 contains the route 2000::/64. (True)
R3 is a Level-1-2 router, meaning it can receive both Level-1 and Level-2 routes.
Since R4 (a Level-1-2 router) advertises the summarized 2000::/64 route into both levels, R3 will receive 2000::/64 in its routing table.
Statement B is true.

CThe routing table of R2 contains the route 2000::/64. (True)
R2 is a Level-1-2 router in the same area as R4, meaning it receives the summarized 2000::/64 route.
This is expected behavior since R4 advertises the summary route into both Level-1 and Level-2 areas.
Statement C is true.

DThe routing table of R5 does not contain the route 2000::/64. (False - Correct Answer)
R5 is a Level-1 router, meaning it can only receive Level-1 routes unless a default route is provided.
Since R3 (a Level-1-2 router) learns 2000::/64, it can propagate it into the Level-1 area (49.0002).
This means R5 will receive the summary route 2000::/64 from R3.
Thus, R5 does contain 2000::/64, making this statement false.
Statement D is false (correct answer).
Final Conclusion:
A. The routing table of R1 contains the route 2000::4/128. (True)
B. The routing table of R3 contains the route 2000::/64. (True)
C. The routing table of R2 contains the route 2000::/64. (True)
D. The routing table of R5 does not contain the route 2000::/64. (False - Correct Answer)
Thus, the correct answer is: D. The routing table of R5 does not contain the route 2000::/64 (False Statement).

Answer : D

Comprehensive and Detailed In-Depth

Understanding the IS-IS Network and IPv6 Route Summary Behavior

IS-IS Areas and Router Roles:

Area 49.0001 (Level-1-2): R1, R2, R4

Area 49.0002 (Level-1-2 & Level-1): R3 (Level-1-2), R5 (Level-1 only)

Effect of ipv6 summary 2000::/64 level-1-2 Command on R4

Route summarization in IS-IS allows an L1-L2 router (R4) to aggregate IPv6 prefixes and advertise a summary route (2000::/64) into both Level-1 and Level-2 areas.

This means R4 will advertise only 2000::/64 instead of specific /128 routes (like 2000::4/128).

All Level-1 and Level-2 routers connected to R4 will receive the summary route 2000::/64 instead of the detailed /128 routes.

Route Distribution Analysis for Each Statement

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 -- IS-IS Route Summarization and IPv6 Multi-Topology

Huawei Official HCIP-Datacom Study Guide -- IS-IS L1/L2 Routing and IPv6 Summarization Commands

Huawei Documentation on IPv6 Route Summary Behavior in IS-IS

Question 6

On the IS-IS IPv6 network shown in the figure, after the network becomes stable:

R1 can ping 2000:12::0, and

The display ipv6 neighbors command can be used to display the MAC address corresponding to 2000:12::0.

Is this statement TRUE or FALSE?

ATRUE

BFALSE

Answer : B

Comprehensive and Detailed In-Depth

Understanding the IPv6 Addressing and IS-IS Network

IPv6 Addressing in the Figure:

R1 has the address: 2000:12::1/64

R2 has the address: 2000:12::0/127

The link between them is using a /127 subnet (2000:12::0/127).

Behavior of IPv6 /127 Subnet Mask

In IPv6, a /127 prefix is commonly used on point-to-point links to avoid the issue of subnet-router anycast (::0).

RFC 6164 recommends using /127 instead of /64 for point-to-point links to reduce unnecessary anycast behavior.

2000:12::0 is the network address (first address in the subnet) and is not assigned to an interface.

Analyzing the Two Statements in the Question

Statement 1: 'R1 can ping 2000:12::0' (Incorrect)

In IPv6, the first address (::0) in a /127 subnet is typically reserved as a network address and not assigned to any router.

R1 cannot ping 2000:12::0 because it is not assigned to R2 as an active IP.

Correct ping targets would be:

R1 pinging R2's actual address (2000:12::1 or 2000:12::2 depending on numbering).

Statement 2: 'display ipv6 neighbors command can be used to display the MAC address corresponding to 2000:12::0' (Incorrect)

The display ipv6 neighbors command is used to show the MAC address of an active neighbor (i.e., a reachable device).

Since 2000:12::0 is not assigned to a specific router, it will not have a MAC address in the neighbor table.

Final Conclusion:

R1 cannot ping 2000:12::0 because it is the network address in a /127 subnet.

The display ipv6 neighbors command cannot show a MAC address for 2000:12::0 because it is not assigned to a router.

Thus, the correct answer is: B. FALSE.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 -- IPv6 Addressing and IS-IS for IPv6

Huawei Official HCIP-Datacom Study Guide -- IPv6 Neighbor Discovery and Point-to-Point Links

RFC 6164 -- Using 127-Bit IPv6 Prefixes on Inter-Router Links

Question 7

IPSG is a source IP address filtering technology based on Layer 3 interfaces. It prevents malicious hosts from forging authorized hosts' IP addresses to access authorized network resources.

ATRUE

BFALSE

Answer : A

Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 H12-831_V1.0 Exam Questions