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H12-831_V1.0-ENU Real Exam Answers - New H12-831_V1.0-ENU Test Answers

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Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q29-Q34):

NEW QUESTION # 29
SFFv2 is an IGP running on an IPv4 network: 0SPFV3 is an IGP running on an IPv6 network. Compared with 0SPFV2, SPFV3 has a similar LSA type, but has slightly different functions. Which of the following is not included in the LSA type of 0SPFV3?

A. Router-LSA
B. AS-External-LSA
C. ASBR-Summary-LSA
D. Network-LSA

Answer: C

NEW QUESTION # 30
On the OSPF network shown in the figure, areas 1, 2, and 3 are common areas. The IP address of Loopback0 on R5 is 10.0.5.5/32, and OSPF is enabled on the interface using the network command.
ACL 2000 (with the matching rule shown in the figure) is configured on all routers. If the command filter
2000 import is run in area 0 (where R1, R2, and R3 reside), which of the following routers do not have the route 10.0.5.5/32 in their routing tables?

A. R4
B. R3
C. R1
D. R2

Answer: B,C,D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the OSPF Network Structure in the Question:
* OSPF Areas & Routers:
* Area 3: Contains R5 (which has loopback 10.0.5.5/32).
* Area 1: Contains R6.
* Area 2: Contains R4.
* Area 0 (Backbone Area): Contains R1, R2, and R3 (which interconnect the other areas).
* ACL 2000 Filtering Rule:
* The ACL rule 2000 explicitly denies 10.0.5.5/32 from being imported.
* The filter 2000 import command applies this filter to Area 0, preventing routes from Area 3 (including R5's loopback) from being learned by Area 0 routers (R1, R2, and R3).
Route Distribution Analysis:
* R5 (Area 3):
* R5 has 10.0.5.5/32 configured on its Loopback0.
* Since OSPF is enabled, R5 advertises the route to R6 in Area 1.
* R6 (Area 1) # R2 (Area 0, Backbone Router):
* Without filtering, R6 would normally propagate 10.0.5.5/32 to R2 (since R2 is a backbone router in Area 0).
* However, since ACL 2000 is applied in Area 0, R2 blocks this route from being imported.
* Therefore, R2 does not learn 10.0.5.5/32.
* R2 # R1 and R3 (Both in Area 0):
* R2 would typically share any learned routes with R1 and R3 in Area 0.
* But since R2 itself does not have 10.0.5.5/32, neither R1 nor R3 can receive it.
* Thus, R1 and R3 also do not have 10.0.5.5/32 in their routing tables.
* R4 (Area 2) is Unaffected:
* Since R4 is in Area 2, it is not directly impacted by the filter applied in Area 0.
* It can still receive the route via another path if redistribution is configured properly.
Final Conclusion:
* R1, R2, and R3 do not have the 10.0.5.5/32 route due to the filter 2000 import command applied in Area 0.
* R4 may still have the route since it is not affected by the filtering in Area 0.
Thus, the correct answer is:# R1, R3, R2 do not have the route 10.0.5.5/32 in their routing tables.

NEW QUESTION # 31
In the hub-spoke networking shown in the figure, the Hub-PE can be configured to allow repetitive local AS numbers for correct route transmission.

Is this statement TRUE or FALSE?
Options:

A. TRUE
B. FALSE

Answer: A

Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Hub-Spoke BGP Design
* Hub-Spoke topology is commonly used in MPLS Layer 3 VPNs, where:
* Hub-PE acts as a central router.
* Spoke-PEs connect to the hub but do not communicate directly with each other.
* eBGP (External BGP) is used between the Hub-PE and Spoke-PE routers.
2. The Role of AS Numbers in BGP Route Transmission
* By default, BGP prevents routes from being sent back to the same AS (Autonomous System) to avoid loops (via the AS_PATH loop prevention mechanism).
* However, in a Hub-Spoke MPLS VPN, the Hub-PE must be allowed to re-advertise routes learned from one spoke to another spoke.
* This requires allowing repetitive AS numbers within the same AS to avoid BGP rejecting valid routes.
3. Solution: Using "Allow-AS Loop" on the Hub-PE
* The allowas-in or allow-as-loop command must be used on Hub-PE to allow repetitive local AS numbers.
* This ensures that routes from Spoke-PE1 (AS65002) are advertised to Spoke-PE2 (AS65003) via Hub-PE, even if AS numbers are repeated.
Example Configuration on Hub-PE:
plaintext
CopyEdit
bgp 65001
peer Spoke-PE1 allow-as-loop 2
peer Spoke-PE2 allow-as-loop 2
* This allows Hub-PE to accept and propagate routes even if the AS number appears more than once.
4. Evaluating the Answer Choices
Option
Correct?
Reasoning
A: TRUE
# Correct
Hub-PE can be configured to allow repetitive AS numbers using the allow-as-loop feature.
B: FALSE
# Incorrect
BGP by default prevents repeated AS numbers, but this can be overridden.
# Correct answer: A. TRUE
Final Conclusion:
* By default, BGP prevents AS loopbacks.
* Hub-PE needs to allow repetitive AS numbers for proper route transmission in the hub-spoke model.
* The "allow-as-loop" command enables this functionality.
* Thus, the correct answer is: TRUE.

NEW QUESTION # 32
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 the LSA is generated by R2 and describes the IPv6 prefix address associated with the Router-LSA.

A. TRUE
B. FALSE

Answer: A

NEW QUESTION # 33
The OSPF protocol runs between CE and PE, when CE1 advertises the route of the site to CE2. Which of the following description is wrong?

A. When PE2 receives the same Domain ID as the local BGP route sent by PE1, for Type3 LSA, PE2 will generate Type5 LSA
B. When PE2 receives a BGP route from PE1 that carries a different Domain ID from the local one, it is correct for all LSAs, and PE2 will generate Type5 LSA or Type7 LSA
C. The Domain ID configured by PE1 can be used as an extended community attribute of BGP and sent along with the route to PE2.
D. When PE2 receives the same Domain ID as the local BGP route sent by PE1, PE2 will generate Type3 LSA for Type1 LSA and Type2 LSA

Answer: A

NEW QUESTION # 34
......

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