[Aug-2026] 100% Actual H12-831_V1.0 dumps Q&As with Explanations Verified & Correct Answers
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NEW QUESTION # 212
R1 and R2 use directly connected interfaces to establish an EBGP peer relationship. R1 imports 2000:: 1/128 to BGR By default, which of the following is the next hop of the route from R2 to 2000:: 1/128?
- A. 2001:12.1
- B. 2003:12::1
- C. 2002: 12:: 1
- D. 2000:12::1
Answer: D
NEW QUESTION # 213
An OSPFv3 NSSA LSA is generated by an ASBR, describes routes to a destination outside the AS, and is advertised in an NSSA.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 214
An engineer used two routers to test IPv6 services, and simulated the interconnection between headquarters and branches by running BGP4+.
The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between two devices, which of the following statements is wrong?
- A. When routing, it will carry AS_Path and other recognized mandatory attributes
- B. When routing, the Next_Hop attribute must be an IPv6 global unicast address
- C. BGP4+ transmits routing information between peers through Update messages
- D. If the Update message carries the MP_REACH_NLRI attribute, it means that the advertised route is reachable
Answer: B
NEW QUESTION # 215
Use the "display current-configuration | include0.2.*" command on the router to see all the information including "10.0.2" in the current configuration.
- A. False
- B. True
Answer: B
NEW QUESTION # 216
BGP allows you to use the filter-policy acl-number import command to filter received routes. The value of ad-number ranges from 2000 to 3999.
- A. O FALSE
- B. O TRUE
Answer: B
NEW QUESTION # 217
Please match 0SPFv3LSA with its transmission range.
- A. LinkLsAlocallinkrange
Answer: A
Explanation:
AS-external-LSA Autonomous system-wide intra-regional propagation
Network-1SA intra-regional spread
NEW QUESTION # 218
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.
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
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
A: The 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.
B: The 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.
C: The 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.
D: The 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).
NEW QUESTION # 219
Which of the following is not a new addition to IS-IS to support the processing and calculation of IPv6 routes?
- A. When publishing IPv6 routes, the MLFID value must be included
- B. TLV 232: It is equivalent to the "IP Interface Address" TLV in IPv4, except that the original 32-bit IPv4 address is changed to a 128-bit IPv6 address
- C. The source IP address of the IS-IS Hello message is changed to the link-local address
- D. TLV 236: describes the reachability of the network by defining routing information prefix, metric value and other information
Answer: C
NEW QUESTION # 220
Which of the following functions will affect BGP neighbor establishment? (Multiple choice)
- A. BGP route filtering
- B. ebgp max hop
- C. BGP authentication
- D. BGP GSTM
Answer: B,C,D
NEW QUESTION # 221
What is the LSA whose flooding range is the entire autonomous system in SPFV3?
- A. Intra-Area-Prefix-LSA
- B. As-external-LSA
- C. Inter-Area-Prefix-LSA
- D. Link-LSA
Answer: B
NEW QUESTION # 222
The OSPF protocol is run between CE and PE, when CE1 advertises the route of its site to CE2. Which of the following descriptions is incorrect?
- A. whenPE2receivePE1sentBGProutedDomain IDcorrect for all when different from localLSA.
PE2will generateType5LSAorType7 LSA - B. PEIconfiguredDomain IDcan be used asBGPThe extended community attribute of is sent with the route toPE2
- C. whenPE2receivePEIsentBGProutedDomain IDSame as local forType3 LSA.
PE2will generateType5 LSA - D. whenPE2receivePE1sentBGProutedDomain IDWhen the same as local, forTypel LSAandType2LSA. PE2will generateType3 LSA
Answer: C
NEW QUESTION # 223
Regarding BGP/MPLS IPVPN data forwarding, which of the following description is wrong?
- A. The inner label during data forwarding is assigned by MP-BGP
- B. The data sent by the PE to the CE is an IPv4 packet
- C. The outer label during data forwarding can be allocated by LDP
- D. When data is transmitted on the BCP/MPLS IP VPN backbone network, it always carries two layers of labels
Answer: D
NEW QUESTION # 224
When an IP packet enters the MPLS domain, the ingress node checks the Tunnel ID corresponding to the destination IP address. When the Tunnel ID is one of the following, the ingress node performs IP forwarding on the packet?
- A. 0x0
- B. 0x2
- C. 0x3
- D. 0x1
Answer: A
NEW QUESTION # 225
An enterprise deploys iBGP across three routers (R1, R2, R3) within the same AS. R1 learns a route from an eBGP neighbor and successfully advertises it to R2. However, R3 does not receive the route from R2. All BGP sessions are established and stable. What is the most likely cause?
- A. BGP synchronization enabled
- B. Missing default route
- C. iBGP split-horizon rule
- D. Missing next-hop-self on R1
Answer: C
NEW QUESTION # 226
When 0SPFV2 evolves to 0SPFV3, the LSA format and function are exactly the same, but the network layer in the LSA address from IPv4 to IPv6o
- A. True
- B. False
Answer: B
NEW QUESTION # 227
In a BGP/MPLS IP VPN network, if you want to modify the RD value of a VPN instance, you must first enable the address family corresponding to the VPN instance or delete the VPN instance.
- A. True
- B. False
Answer: B
NEW QUESTION # 228
Configuring DHCP Snooping can be used to prevent imitators from attacking. Which of the following steps should be included in the configuration process? (Multiple choice)
- A. Enable global DHCP function
- B. Configure interface trust status
- C. Enable DHCP Snooping on the interface or VLAN
- D. Enable the global DHCP Snooping function
Answer: A,B,C,D
NEW QUESTION # 229
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