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NEW QUESTION # 54
As shown in the figure, all interfaces of the router enable OSPF, among which R4 and R5 can establish OSPF virtual connections.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 55
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. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 56
In the OSPFv3 network shown in the figure, area 1 is an NSSA area. R1 imports the external route 2000::1/128 into OSPFv3.
Which of the following descriptions are correct by default? (Multiple choice)
- A. R1 will generate an AS-Externa1-LSA describing 2001::1/128
- B. There is no default route in the routing table of R1 and R2.
- C. R2 is responsible for converting the NSSA LSA describing 2001::1/128 generated by R1 into an AS-External-LSA
- D. R1 will generate an NSSA LSA describing 2001::1/128
Answer: A,B,D
NEW QUESTION # 57
(Drag and drop question) The configuration shown in the figure is performed on R2 to filter all incoming routes. Suppose there is an entry on R1 AS_Path attribute is [100 200 300 400] BGP routes need to be sent to R2, please help network administrators in Adjust the AS order in the AS_Path attribute of the route on R1 to ensure that the route entry will not be routed by R2 route^policy AS-PATH permit node 10 if-match as-path-filter BGP route-policy AS-PATH deny node 20 ip as-path-filter BGP permit A[A2]00 400 100_
route-policy AS-PATH permit node 10 if-match ip-prefix BGP
apply as-path overwrite
ip ip-prefix BGP permit 10.0.0.0 24
- A. 300-B 400-A 100-C 200-D
- B. 300-A 400-C 100-B 200-D
- C. 300-A 400-B100-C 200-D
- D. 300-C 400-A 100-B 200-D
Answer: C
NEW QUESTION # 58
As shown in the figure, R1, R2, R3, and R4 are in the same PLs domain, and LDP is used to distribute IPLS labels between devices. R4 is the Egress LSR of the FEC 4.4.4.0/24. If you want to achieve R1 access
4.4.4.0/24, R4 does not need to query the label table but can know the forwarding priority of the data, then the outgoing label of R3 for the FEC should be:____. (Please fill in the Arabic numerals directly, without symbols)
Answer:
Explanation:
(0)
NEW QUESTION # 59
What is the value of the linkage between OSPF and BFD?
- A. Detected at the millisecond levelBFD. associationOSPFstate, fulfilledOSPFThe purpose of quickly sensing the status of the tank
- B. BFDAny change in state will not affectOSPFneighbor state
- C. OSPFofhelloThe sending interval is in seconds, more thanBFDInduction link status is fast
- D. BFDThe message sending interval can reach the millisecond level, which is less thanOSPFInduction link status is slow
Answer: A
NEW QUESTION # 60
The route reflector and its clients form a cluster, using the unique Cluster ID in the AS as an identifier. When a route is reflected by the RR for the first time, if there is no Cluster_List attribute, the RR will add the local Cluster ID to the front of the Cluster_List. If a route already has the Cluster_List attribute, the RR will no longer modify the Cluster_List attribute.
- A. False
- B. True
Answer: A
NEW QUESTION # 61
BGP4+ carries the next hop address of the IPv6 route through the Next Hop attribute in the Update message.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 62
MPLS has the concept of FEC forwarding equivalence class, so FEC cannot be allocated based on which of the following standards?
- A. Class of Service
- B. Fragment of fiset
- C. Destination Addess
- D. Application Protocol
Answer: B
NEW QUESTION # 63
The rollback operation of project cutover can be temporarily determined according to the situation during cutover, and no advance plan is required.
- A. False
- B. True
Answer: A
NEW QUESTION # 64
On the OSPF network shown in the figure, drag the values on the left to the correct positions so that:
* Traffic from PC1 to PC2 follows the path:PC1 -> R1 -> R3 -> R2 -> PC2
* Traffic from PC2 to PC1 follows the path:PC2 -> R2 -> R1 -> PC1
Which of the following OSPF cost values should be assigned to Cost-A, Cost-B, and Cost-C to achieve this routing behavior?
Answer:
Explanation:
Explanation:
* A = 50
* B = 10
* C = 20
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPF Path Selection and Cost Calculation:
* OSPF selects the shortest path (lowest cost) to the destination.
* The OSPF cost is determined by the cumulative sum of interface costs along a path.
* By assigning specific costs to A, B, and C, we can influence OSPF's path selection to meet the desired routing behavior.
Step-by-Step Analysis of Required Traffic Flow:
1. Traffic from PC1 to PC2 must take the route:
PC1 -> R1 -> R3 -> R2 -> PC2
* To force traffic through R3, the cost of the direct link R1 -> R2 (Cost-A) must be higher than the alternative path via R3.
* We assign Cost-A = 50 (high cost) to discourage direct routing from R1 -> R2.
* The cost of R1 -> R3 (Cost-C) should be lower, so we assign Cost-C = 20.
* The cost of R3 -> R2 (default Cost-20) remains unchanged.
* Total cost via R3: 20 (R1->R3) + 20 (R3->R2) = 40, which is less than the direct link of 50, so OSPF prefers this path.
# Traffic follows: PC1 -> R1 -> R3 -> R2 -> PC2
2. Traffic from PC2 to PC1 must take the route:
PC2 -> R2 -> R1 -> PC1
* We need to make R2 -> R1 (Cost-B) the best (lowest cost) route for return traffic.
* Assign Cost-B = 10 (low cost).
* This ensures that R2 prefers the direct path R2 -> R1 instead of R2 -> R3 -> R1 (which costs
20+20=40).
# Traffic follows: PC2 -> R2 -> R1 -> PC1
Final Cost Assignments for Correct Routing Behavior:
Cost
Assigned Value
Reason
Cost-A (R1 -> R2)
50
High to discourage direct R1->R2 routing
Cost-B (R2 -> R1)
10
Low to ensure PC2->PC1 prefers direct R2->R1
Cost-C (R1 -> R3)
20
Medium to encourage R1->R3->R2 path
Key Takeaways:
* Higher OSPF cost discourages path selection.
* Lower OSPF cost encourages path selection.
* By manipulating OSPF cost values, we achieve asymmetric routing between PC1 and PC2.
* This aligns with OSPF path selection principles covered in HCIP-Datacom certification.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on OSPF Cost Calculation and Path Selection.
* Huawei Enterprise Networking Training Materials, OSPF Path Optimization Techniques.
* Huawei Datacom Configuration Guide, OSPF Cost and Traffic Engineering.
NEW QUESTION # 65
In order to protect the BGP protocol from attacks, Keychain authentication can be used between BGP neighbors to reduce the possibility of attacks. The keychain has a set of passwords that can be automatically switched according to the configuration, which is suitable for networks with high security requirements.
- A. True
- B. False
Answer: A
NEW QUESTION # 66
The Router-LSA generated by a router is shown in the figure. Based on this LSA, which of the following descriptions are correct? (Multiple choice)
- A. The router is an ABR
- B. At least one interface of the router belongs to the Stub area
- C. At least one interface of the router belongs to area 0
- D. The router is an ASBR
Answer: A,C
NEW QUESTION # 67
Network engineers found that the multicast client could not receive multicast data correctly, so they suspected that the group address set by the multicast server was wrong. Which of the following cannot be the group address?
- A. 224.0.0.1
- B. 224.0.1.5
- C. 233.0.0.2
- D. 232.0.0.18
Answer: A
NEW QUESTION # 68
A router LSA is shown in the figure. Which of the following statement is wrong?
- A. This router is DR
- B. The router has established adjacency
- C. This router supports the import of external routes
- D. The Router ID of this router is 10.0.12.1
Answer: A
NEW QUESTION # 69
LSR (Label Switching Router) discovers LDP peers through the LDP discovery mechanism and establishes LDP sessions. Which of the following descriptions of LDP sessions are correct?
(Multiple choice)
- A. LSR sends Hello message based on UDP
- B. LSR discovers LDP peers by sending multicast or unicast Hello messages
- C. LSR can establish a local LDP session or a remote LDP session based on the LDP discovery mechanism
- D. The LSR with a larger transmission address actively initiates the establishment of a TCP link
Answer: A,B,C,D
NEW QUESTION # 70
An engineer uses two routers to test IPv6 services, and simulates the interconnection between the headquarters and branches by running BGP4+. The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between the two devices, which of the following Is a statement wrong?
- A. If the MP_REA, CH_NLRI attribute is carried in the Update packet, it indicates that the advertisement is a reachable route
- B. The Next_Hop attribute must be an IPv6 global unicast address when routing
- C. BGP4+ transmits routing information between peers through Update packets
- D. When the route is transmitted, it will carry recognized mandatory attributes such as AS_Path
Answer: B
NEW QUESTION # 71
When dealing with a fault in the existing network, a network engineer drew a topology diagram as shown in the figure. All routers run SPF. Which of the following descriptions about the access path between PC1 and PC2 is correct?
- A. The path from PC1 to PC2 is: PC1-R1-R2-PC2, and the path from PC2 to PC1 is: PC2-R2-R1- PC1
- B. The path from PC1 to PC2 is: PC1-R1-R3-R2-PC2; the path from PC2 to PC1 is: PC2- R2-R1- PC1
- C. The path from PC1 to PC2 is: PC1-R1-R2-PC2: The path from PC2 to PC1 is: PC2- R2-R3-R1- PC1
- D. The path from PC1 to PC2 is: PC1-R1-R3-R2-PC2; the path from PC2 to PC1 is: PC2- R2-R3- R1-PC1
Answer: D
NEW QUESTION # 72
In the OSPF network shown in the figure, the area numbers are marked in the figure, where area
1 is an NSSA area, and areas 2 and 3 are common areas. The "default-route- advertise always" command is configured in the SPF process of R5. Which of the following routers have default routes in their routing tables? (Multiple choice)
- A. R3
- B. R4
- C. R2
- D. R6
Answer: A,B,C,D
NEW QUESTION # 73
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 # 74
Which of the following functions will affect BGP neighbor establishment? (Multiple choice)
- A. BGP GSTM
- B. ebgp max hop
- C. BGP route filtering
- D. BGP authentication
Answer: A,B,D
NEW QUESTION # 75
An enterprise enables BFD for OSPF on Huawei devices to achieve sub-second convergence.
After enabling BFD, OSPF sessions begin to flap frequently. Which parameter should be adjusted first to improve stability?
- A. OSPF area type
- B. BFD detection multiplier or interval
- C. OSPF interface cost
- D. LSA refresh timer
Answer: B
NEW QUESTION # 76
As shown in the figure, the network administrator deployed the DHCP Snooping trust function on the switch, where GE0/0/2 is the trusted interface and GE/0/3 is the untrusted interface.
Which of the following descriptions of these two interfaces are correct? (Multiple choice)
- A. When the switch receives a DHCP request message from port GE0/0/3, it forwards the message from port GE0/0/2.
- B. When the switch receives a DHCP response message from port GE0/0/3, it forwards the message from port GE0/0/1.
- C. When the switch receives a DHCP request message from port GE0/0/2, it forwards the message from port GE0/0/3.
- D. When the switch receives a DHCP response message from port GE0/0/2, it forwards the message from port GE0/0/1.
Answer: A,C,D
NEW QUESTION # 77
In the OSPF network shown in the figure, the area numbers are marked in the figure, where area
1 is the Stub area, area 2 is the Totally NSSA area, and area 3 is the NSSA area. If R5 introduces an external route 10.0.5.5/32, which of the following routers do not have a route entry for 10.0.5.5/32 in their routing tables? (Multiple choice)
- A. R3
- B. R2
- C. R4
- D. R6
Answer: C,D
NEW QUESTION # 78
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