Free Huawei (H12-831_V1.0-ENU) Certification Sample Questions with Online Practice Test
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Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Certification Exam is a challenging and rewarding exam for professionals who wish to validate their knowledge and skills in advanced routing and switching technologies. It is a valuable credential that can help professionals advance their careers and stand out in a competitive job market.
NEW QUESTION # 94
On the network shown in the figure, IS-IS runs on R1, 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. The import-route isis level-2 into level-1 command is configured on R2 and R5. In AS 65000, R1, R3, R4, and R6 each establish IBGP peer relationships with R2 and R5. R2 and R5 are RRs, and R1, R4, R3, and R6 are clients. The IBGP peer relationships are established using Loopback0. The IP address of Loopback0 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. R1 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. The routing table of R4 contains two equal-cost default routes.
- B. The route 192.168.2.0/24 in the routing table of R4 has two different outbound interfaces.
- C. The routing table of R1 contains two equal-cost default routes.
- D. The routing table of R1 contains the route 192.168.2.0/24.
Answer: B,D
NEW QUESTION # 95
In an MPLS network, functions such as neighbor discovery, session establishment and maintenance, and label management are implemented by exchanging LDP messages between SRs running the DP protocol. To ensure the reliability of message delivery, all LDP messages are sent and received based on TCP connections.
- A. False
- B. True
Answer: A
NEW QUESTION # 96
Which of the following statements about VLAN aggregation is correct? (Multiple choice)
- A. Sub-VLAN contains physical interfaces. A three-layer VLANIF interface can be established
- B. Sub-VLAN is used to isolate the broadcast domain
- C. A Super-VLAN can contain one or more SUb-VLANs
- D. Super-VLAN only contains physical interfaces and cannot establish a Layer 3 VLANIF interface
Answer: B,C
NEW QUESTION # 97
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, R6 preferentially selects the BGP route received from R2.
- B. For 192.168.2.0/24, R2 preferentially selects the BGP route received from R3.
- C. For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2.
- D. For 192.168.2.0/24, R5 preferentially selects the BGP route received from R3.
Answer: A,B,C,D
NEW QUESTION # 98
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. If a service passes through the path R1 # R5 # R3 to reach 10.0.3.3/32, which of the following is the backup outbound interface for the service?
- A. There is no backup outbound interface.
- B. GE0/0/3
- C. GE0/0/2
- D. GE0/0/2 and GE0/0/3
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Identify the Primary Path
* The shortest OSPF cost to 10.0.3.3/32 from R1 is through R5:
* R1 # R5 (Cost 10) # R3 (Cost 10) = Total Cost 20
* The primary outbound interface from R1 to R5 is GE0/0/1.
Step 2: Identify the Backup Path (OSPF IP FRR & ECMP)
* OSPF IP Fast Reroute (FRR) provides a backup next-hop in case the primary link (R1 # R5) fails.
* A feasible backup path must have a cost equal to or close to the primary path, but it must avoid the same failure point.
Alternative Path Calculation:
* Path 1 (R1 # R2 # R3)
* R1 # R2 (Cost 10), R2 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/2 on R1.
* Path 2 (R1 # R4 # R3)
* R1 # R4 (Cost 10), R4 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/3 on R1.
Final Decision on the Backup Interface
* Since both paths R1 # R2 # R3 and R1 # R4 # R3 have equal costs, either can be used for backup.
* However, R1 # R2 # R3 shares a direct cost path with R5, meaning it may not be preferred as a full FRR backup.
* The best backup outbound interface in this scenario is GE0/0/3 (R1 # R4 # R3).
Final answer: # C (GE0/0/3)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF IP FRR (Fast Reroute) Mechanism
* OSPF Equal-Cost Multi-Path (ECMP) and Backup Route Selection
* OSPF Route Calculation and Best-Path Selection
NEW QUESTION # 99
A certain park deployed both IPv4 and IPv6 networks for service testing, and IS-IS was run to achieve network interconnection. IS-IS routing protocol has good scalability and is widely used in existing networks.
Regarding IS-IS scalability, which of the following statements are correct? (Multiple choice)
- A. IS-IS uses TLV structure to construct messages, which makes IS-IS more flexible and expandable
- B. NLPID is a new TLV of IS-IS to support IPv6
- C. IS-IS needs to add TLV to carry Pv6 address information in order to support PV6
- D. For IS-IS, adding new features only needs to add a new TLV
Answer: A,C,D
NEW QUESTION # 100
A campus deploys both IPv4 and IPv6 networks for service testing, and runs IS-IS to realize network interconnection. The IS-IS routing protocol has good scalability and is widely used in the existing network. Which of the following statements is true about IS-IS scalability?
- A. forIS-ISIn terms of adding new features, only adding newTLVJust
- B. IS-ISuseTLVstructure builds the message so thatIS-ISMore flexibility, flexibility and scalability
- C. IS-ISto supportPV6to addTLVcarryPv6Address information
- D. N LPIDYesIS-ISto supportIPv6an addedTLV
Answer: A,B,C
NEW QUESTION # 101
There are multiple types of MAC address entries on a switch. Which of the following entries are manually configured and cannot be aged out?
- A. Static MAC address entries
- B. Blackhole MAC address entries
- C. MUX MAC address entries
- D. Dynamic MAC address entries
Answer: A,B
NEW QUESTION # 102
EGP authentication can prevent illegal routers from establishing neighbors with B, CP routers. B, CP authentication can be divided into MD5 Authentication and Keychain authentication, which of the following BGP documents will carry the B, CGP Keychain authentication letter interest? (header carry)
- A. Notice
- B. Open
- C. Update
- D. Keepalive
Answer: A,B,C,D
NEW QUESTION # 103
The figure shows an MPLS packet with multiple labels.
Which of the following values for the S field is correct?
- A. S1 = 1, S2 = 1, S3 = 0
- B. S1 = 3, S2 = 2, S3 = 1
- C. S1 = 2, S2 = 1, S3 = 0
- D. S1 = 0, S2 = 0, S3 = 1
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Stack and the S (Bottom of Stack) Bit
* MPLS (Multiprotocol Label Switching) packets can have multiple labels stacked on top of each other.
* Each label has the following fields:
* Label (20 bits): Identifies the forwarding path.
* EXP (3 bits): Used for QoS/priority marking.
* TTL (8 bits): Time-to-live, similar to IP TTL.
* S (1 bit): Bottom of Stack (BoS) indicator:
* S = 0: This is not the last label in the stack.
* S = 1: This is the last label in the stack, meaning the next header is the IP header.
2. Analyzing the MPLS Packet Structure in the Figure
* The diagram shows three MPLS headers (labels).
* The last MPLS header before the IP header must have S = 1, indicating the bottom of the stack.
* All other MPLS headers above it must have S = 0, meaning they are part of the stacked labels.
3. Evaluating the Answer Choices
Option
S1
S2
S3
Correct?
Reasoning
A
3
2
1
# Incorrect
S field cannot have values greater than 1.
B
2
1
0
# Incorrect
S field must be 0 for non-bottom labels.
C
1
1
0
# Incorrect
There should be only one label with S = 1 (BoS).
D
0
0
1
# Correct
Only the last label should have S = 1.
# Correct answer: D. S1 = 0, S2 = 0, S3 = 1
Final Conclusion:
* Only the last MPLS label (closest to the IP header) should have S = 1.
* All previous MPLS labels should have S = 0.
* Thus, the correct answer is: D. S1 = 0, S2 = 0, S3 = 1
NEW QUESTION # 104
On the OSPFv3 network shown in the figure:
* Area 1 is a stub area
* Area 2 is a common area
* Area 3 is an NSSA
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.
Which of the following statements are true?
- A. The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 3.
- B. The Inter-Area-Prefix-LSA that is generated by R2 and describes 2000::6/128 exists in Area 1.
- C. The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 0.
- D. The Inter-Area-Prefix-LSA that is generated by R3 and describes 2000::6/128 exists in Area 2.
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine the correct answers, we need to analyze OSPFv3 behavior and Inter-Area-Prefix LSAs (Type
3 LSAs).
1. Understanding OSPFv3 Inter-Area-Prefix LSAs (Type 3 LSAs)
* Type 3 LSAs (Inter-Area-Prefix LSAs) are generated by an ABR (Area Border Router) to advertise networks between areas.
* If a router in one area learns a prefix from another area, it generates a Type 3 LSA to advertise it further.
* Stub areas (Area 1) do not allow external LSAs, including Type 3 LSAs for external routes.
* NSSA areas (Area 3) accept external routes but redistribute them as Type 7 LSAs before being converted to Type 5 LSAs by an NSSA ABR.
2. Analyzing Each Answer Option:
# A. "The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 0." # TRUE
* R6 has 2000::6/128 in Area 2.
* R2 is the ABR that brings this prefix into Area 0 as a Type 3 LSA.
* R1, being in Area 0, learns this LSA from R2.
* Thus, this statement is correct.
# B. "The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 3." # FALSE
* R1 is not an ABR for Area 3, so it does not generate an LSA for 2000::6/128 in Area 3.
* Instead, R3 (the ABR between Area 0 and Area 3) would be responsible for propagating routes.
* This statement is false.
# C. "The Inter-Area-Prefix-LSA that is generated by R2 and describes 2000::6/128 exists in Area 1." # FALSE
* Area 1 is a stub area and does not accept external LSAs (including Type 3 LSAs from other areas).
* R2 cannot generate and send a Type 3 LSA for 2000::6/128 into Area 1.
* This statement is false.
# D. "The Inter-Area-Prefix-LSA that is generated by R3 and describes 2000::6/128 exists in Area 2." # TRUE
* R3 is an ABR and learns 2000::6/128 from R2 (which originally learned it from R6 in Area 2).
* Since Area 2 is a normal (non-stub, non-NSSA) area, Type 3 LSAs are allowed.
* R3 generates and advertises this Inter-Area-Prefix-LSA for 2000::6/128 into Area 2.
* Thus, this statement is correct.
NEW QUESTION # 105
There is a concept of forwarding equivalence class (FEC-Fowarding Equivalence Class) in MPLS, so FEC does not Can the allocation be made based on which of the following criteria?
- A. Service type(Class of Service)
- B. Application protocol(Application Protocol)
- C. Fragment offset (Fragment office)
- D. target address(Destination Addess)
Answer: C
NEW QUESTION # 106
Which of the following statements is false when troubleshooting the dual-active failure of a VRRP backup group?
- A. need to checkVRRPgroup of virtualIPIs the address the same
- B. need to check the interfaceVRRPGroupIDIs it the same
- C. No need to check deliveryVRRPWhether the switch port of the advertisement message is in the sameVLAN
- D. Interface needs to be checkedIPWhether the address is in the same network segment
Answer: C
NEW QUESTION # 107
In the LDP session establishment process, the active party will first send the lnitialization information for parameter negotiation, and if the passive party does not accept the negotiation parameters, it will send _____ .
- A. Error Notification Message
- B. Keepalive Message
- C. Initialization Message
- D. Hello Message
Answer: A
NEW QUESTION # 108
After the VLAN-based MA, C address flapping detection function is configured, if the MA, C address flaps. The interface can be configured to perform actions according to requirements. Which of the following is NOT a configurable action?
- A. MA, Caddress blocking
- B. send alert
- C. Traffic filtering
- D. interface blocking
Answer: C
NEW QUESTION # 109
(Connection question) Please correspond the alarm level with the importance of the fault and the countermeasures. (Multiple choice)
Answer:
Explanation:
NEW QUESTION # 110
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