[Jul 11, 2025] Latest H12-831_V1.0-ENU Exam with Accurate HCIP-Datacom-Advanced Routing & Switching Technology V1.0 PDF Questions
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NEW QUESTION # 85
OSPFv2 is an IGP running on an IPv4 network, OSPFvV3 is an ICP running on an IPv6 network. OSPFv3 and OSPFv2 have the same message types, including Hallo messages, DD messages, LSU messages, LSU messages and SACK messages.
Regarding OSPFv3 packets, which of the following statements is correct?
- A. The He11o packet of OSPFv3 carries the IPv6 address prefix list of the router interface
- B. OSPFv3 uses the link-local address as the source address of the sent message, and the message can be forwarded outside the range of the originating link
- C. OSPFv3 uses the authentication field in the header of the message to complete message authentication
- D. OSPFv3 uses IPv6 multicast addresses FFO2::5 and FFO2:.6 to send OSPFv3 packets
Answer: D
NEW QUESTION # 86
There is the concept of forwarding equivalent FEC in MPLS. Which of the following descriptions is wrong? (Multiple choice)
- A. The packets of the same FEC will be processed differently in the MPLS network
- B. MPLS classifies packets with the same forwarding processing method into one category, which is called FEC
- C. The division of FEC is very flexible. It can be based on any combination of source address, address, source port, destination port, protocol type or VPN, etc.
- D. A forwarding equivalence FEC will be assigned a unique label value on all routers
Answer: A,D
NEW QUESTION # 87
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 R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command.
* The aggregate 192.168.1.0/16 detail-suppressed command is configured on R2.
Which of the following is the path for traffic from R3 to 192.168.1.0/24?
- A. R3 # R5 # R4
- B. R3 # R2 # R1
- C. R3 # R6 # R5 # R1
- D. R3 # R5 # R1
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP Network Topology in the Question:
* EBGP Peering & Route Distribution
* Each router forms EBGP peer relationships with directly connected neighbors.
* BGP learns and propagates routes via EBGP neighbors.
* R1 and R4 advertise the static route 192.168.1.0/24 into BGP.
* Effect of the aggregate 192.168.1.0/16 detail-suppressed Command on R2
* R2 performs BGP route aggregation, summarizing 192.168.1.0/24 into a larger 192.168.1.0/16 route.
* The detail-suppressed option hides the more specific 192.168.1.0/24 prefix when advertising routes.
* As a result, R2 does not advertise the specific 192.168.1.0/24 route to its neighbors.
Route Selection and Traffic Flow Analysis:
* R1 and R4 originate 192.168.1.0/24 and advertise it via BGP.
* R2 does not advertise the 192.168.1.0/24 route because of the detail-suppressed command.
* R3 cannot learn the specific route from R2, so it must choose an alternative path via R5.
* R5 learns 192.168.1.0/24 from R1 and advertises it to R3.
* Thus, the best available path for R3 to reach 192.168.1.0/24 is R3 # R5 # R1.
# Correct Path: R3 # R5 # R1
Checking Each Option:
# Option A: R3 # R5 # R1 (Correct)
* R3 learns 192.168.1.0/24 from R5, and R5 forwards traffic to R1, which has the static route.
# Option B: R3 # R2 # R1 (Incorrect)
* R2 does not advertise 192.168.1.0/24 due to route summarization (detail-suppressed), so R3 cannot use R2 as the next hop.
# Option C: R3 # R6 # R5 # R1 (Incorrect)
* This is an unnecessary detour.
* R3 has a direct EBGP connection with R5, so it will use the shortest path (R3 # R5 # R1) instead of going through R6.
# Option D: R3 # R5 # R4 (Incorrect)
* R3 prefers the shortest AS path to reach 192.168.1.0/24.
* Since R1 and R4 both advertise the route, R3 will prefer the route via R5 to R1 rather than R4.
Final Conclusion:
# A. The correct path for traffic from R3 to 192.168.1.0/24 is R3 # R5 # R1.
Thus, the correct answer is: A.
NEW QUESTION # 88
In the absence of a header, the LDP adjacencies will trigger the establishment of LSPO based on the IP routing of the 32-bit address.
- A. False
- B. True
Answer: B
NEW QUESTION # 89
(Connection question) Please correspond the alarm level with the importance of the fault and the countermeasures. (Multiple choice)
Answer:
Explanation:
NEW QUESTION # 90
After the cutover is completed, which items generally need to be checked? (Multiple choice)
- A. Control plane entries
- B. Data flow
- C. Physical topology
- D. Software version
Answer: A,B
NEW QUESTION # 91
If faced with a complex network failure, and it is estimated that the troubleshooting cannot be completed in a short period of time, and the user urgently needs to restore the availability of the network, then the correct approach is.
- A. Communicate with users whether it is possible to skip the faulty node and build an alternative network environment
- B. Always try to troubleshoot without informing the user of the current troubleshooting difficulty
- C. Tell the user it's not possible
- D. Directly build an alternative network environment without notifying customers
Answer: A
NEW QUESTION # 92
Which of the following reasons may cause the hosts in the same VLAN of the LAN to fail to communicate with each other?
- A. The wrong port is configured on the switch andMA, Caddress binding
- B. switchMA, Caddress learning errors
- C. interface is artificialshutdownor the physical interface is damaged
- D. Port isolation is configured on the switch
Answer: A,B,C,D
NEW QUESTION # 93
Which of the following statements about 1S-IS (IPv6) is correct? (Multiple choice)
- A. To support the processing and calculation of IPv6 routing, IS-IS added NLPID to 129 TLV
- B. To support the processing and calculation of IPv6 routes, IS-IS has added TLV232236
- C. By default, IS-IS enables the multi-topology feature
- D. IS-IS working at the data link layer only needs to add a new TLV to support Pv6
Answer: A,B,D
NEW QUESTION # 94
By default, the Domain ID of each OSPF process running on the router is the same as the process number of the process, which can be modified by the domain-id command under the process
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 95
Network administrator A wants to check the neighbor status of BGP router R2. R2's BGP neighbor status information is shown in the figure. Please help network administrator A to obtain the following information: The AS where R2 is located is AS (). (Note: Only write numbers, do not add punctuation or spaces)
Answer:
Explanation:
102
NEW QUESTION # 96
In OSPFv3, an LSA whose propagation range is one area has_____kind. (Fill in Arabic numerals only)
Answer:
Explanation:
9
NEW QUESTION # 97
As shown in the figure, the MP_BGP neighbor relationship is established between PE1 and PE2 through the LoopbackO interface. After the configuration is complete, it is found that CE1 and CE2 cannot learn routes from each other. Which of the following options will cause this problem.
- A. PEIorPE2not presentBGP-VPNv 4Enabling neighbors in unicast address family view
- B. PE1andPE2betweenLSPTunnel not established
- C. PF1orPE2with each otherCEMisconfigured routing protocol between
- D. PE1orPE2±ofVPNInstance parameter configuration error
Answer: A,B,C,D
NEW QUESTION # 98
The RR rules for advertising routes break the IBGP split horizon rules, so it may cause loops in the AS.
What routing attributes does RR use to prevent loops? (Multiple choice)
- A. AS-PATH
- B. Cluster List
- C. Next hop
- D. Originator ID
Answer: B,D
NEW QUESTION # 99
On the network shown in the figure, IS-IS runs on Rl, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, Ri, R3, R4, and R6 each establish IBGP peer relationships with R2 and R5. R2 and R5 are RRs, and Rl, R4, R3, and R6 are clients. The IBGP peer relationships are established using LoopbackO. The IP address of LoopbackO on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router. Rl and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command. Which of the following statements are true?
- A. For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2.
- B. For 192.168.2.0/24, R5 preferentially selects the BGP route received from R3.
- C. For 192.168.2.0/24, R2 preferentially selects the BGP route received from R3.
- D. For 192.168.1.0/24, R6 preferentially selects the BGP route received from R2.
Answer: A,B,C,D
NEW QUESTION # 100
LDP messages are exchanged between LSRs running the LDP protocol. LDP messages can be divided into four types according to their functions. Which of the following is not a message type of LDP?
- A. conversation message
- B. label exchange message
- C. announcement message
- D. discovery message
Answer: B
NEW QUESTION # 101
Regarding the description of the encapsulation format of labels in MPLS, the correct one is
- A. MPLSThe total length of a single label is4bytes(32bits)
- B. For Ethernet,PPPpacket, the tag stack is like 'shim*-between the L2 header and the data: yesVLAN tagTime,MPLShead on the ether head withVLAN tagbetween
- C. in the labelSfield:lbit,Used to identify whether the label is the bottom label of the stack, the value is1is indicated as the penultimate layer label
- D. in the labelTTLfields andIPgroupedTTL( Time To Live.,time-to-live) is similar in meaning and also has the effect of preventing loops
Answer: A,D
NEW QUESTION # 102
As shown in the figure, OSPF is deployed in a campus, and Area 1 is deployed as an NSSA area. By default, R2 will automatically generate a Type 7 LSA default route and flood it in the NSSA area.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 103
As shown in the figure, the network has a loop because STP is not enabled. Which of the following phenomena may be bowed?
- A. MA, CAddress table flapping
- B. The device will generate a loop alarm
- C. Hostreceive a large number of broadcasts
- D. equipmentCPUOccupancy is too high
Answer: A,B,C,D
NEW QUESTION # 104
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