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| Section | Objectives |
|---|---|
| Topic 1: Network Design and Troubleshooting | - Fault Diagnosis
|
| Topic 2: IP Network Technologies | - IS-IS Routing Protocol
|
| Topic 3: MPLS and VPN Technologies | - VPN Implementation
|
| Topic 4: Network Services and Optimization | - QoS Fundamentals
|
| Topic 5: Advanced Routing Protocols | - BGP Configuration and Policy Control
|
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NEW QUESTION # 99
As shown in the figure, when a network engineer is troubleshooting, he draws a schematic diagram of a multicast network. The IGIP version enabled by R1 and R2 is 2, PIM-SM is used as the multicast routing protocol, and other configurations are default configurations. The querier in the multicast network is ().
Answer:
Explanation:
R1
NEW QUESTION # 100
In the Hub&Spoke network shown in the figure, Hub-PE can allow local AS number duplication through manual configuration to achieve correct routing transmission.
Answer: B
NEW QUESTION # 101
OSPFv3 packets are encapsulated in IPv6 packets and can be sent in unicast, multicast, or broadcast mode.
Answer: B
Explanation:
OSPFv3 operates over IPv6 and uses the IPv6 header directly. It can transmit packets in the following modes:
* Multicast : Uses standard multicast addresses such as:
* FF02::5 (All OSPF routers)
* FF02::6 (All DR/BDR routers)
* Unicast : Used for point-to-point neighbor communication when required.
* Broadcast : On broadcast-capable networks, such as Ethernet.
# Official Reference from Huawei:
" OSPFv3 runs directly on top of IPv6 and uses the IPv6 header for transport. It supports unicast, multicast, and broadcast modes, similar to OSPFv2 but adapted for IPv6. "
- [Huawei HCIA-Datacom Certification Guide - OSPFv3 Fundamentals]
NEW QUESTION # 102
In the BFD (Bidirectional Forwarding Detection) mechanism, two systems establish a BFD session and periodically send BFD control packets along the path between them. If one system does not receive BFD control packets within a specified period, the path is considered faulty.
Which of the following is NOT a possible cause of the BFD session down event?
Options:
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* BFD (Bidirectional Forwarding Detection) is a high-speed failure detection mechanism that monitors link availability between two routers.
* A BFD session can go down due to several reasons, including:# UDP Port 4784 blocked: BFD control packets are encapsulated in UDP with destination port 4784, so blocking this port prevents BFD communication (option A is a valid cause).# Physical interface failure: If the outbound interface for a single-hop BFD session fails, BFD will go down (option B is a valid cause).# Mismatched discriminators: BFD sessions use local and remote discriminators to uniquely identify sessions; if these do not match, the session cannot be established (option C is a valid cause).
* Incorrect BFD session names do NOT cause the session to go down, because BFD sessions are identified by discriminator values, not names. (Option D is incorrect and is the correct answer to this question.)
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - BFD Mechanism & Troubleshooting
NEW QUESTION # 103
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled and function as the gateways of PC1 and PC2, respectively .
Given this, which of the following statements are true?
Network Topology:
* R1:
* Interface GE0/0/0 : 10.0.12.1/24 (Connected to R2)
* Interface GE0/0/1 : 192.168.1.1/24 (Gateway for PC1)
R2:
* Interface GE0/0/0 : 10.0.12.2/24 (Connected to R1)
* Interface GE0/0/1 : 192.168.1.2/24 (Gateway for PC2)
Options:
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Understanding the network connectivity:
* R1 and R2 are connected through 10.0.12.0/24 and running OSPF in Area 0.
* PC1 (192.168.1.11/24) is connected to R1 , and PC2 (192.168.1.12/24) is connected to R2 .
* Analyzing each option:
* Option A: " R2 cannot ping 10.0.12.1. " # Incorrect
* R2 is directly connected to 10.0.12.1/24 (R1) on GE0/0/0 , so it can ping this IP without any routing issues.
* Option B: " PC1 and PC2 cannot ping each other. " # Correct
* OSPF is only running between R1 and R2 . There is no indication that R1 and R2 are redistributing connected routes (192.168.1.0/24 and 192.168.1.0/24) into OSPF.
* As a result, R1 does not know how to reach 192.168.1.12 , and R2 does not know how to reach 192.168.1.11 , making communication between PC1 and PC2 impossible .
* Option C: " R1 cannot ping 192.168.1.2. " # Incorrect
* 192.168.1.2 is directly connected to R2 , and if R1 can reach R2 through OSPF, then R1 should be able to ping 192.168.1.2.
* Option D: " R1 cannot ping 192.168.1.12. " # Correct
* 192.168.1.12 is connected to R2 , but if R2 does not advertise this network to R1, R1 has no route to reach it .
* Since PC1 (192.168.1.11) and PC2 (192.168.1.12) are on different subnets, and there ' s no redistribution , R1 cannot reach PC2 ' s IP .
Key Takeaways and Fix Recommendations:
* To allow PC1 and PC2 to communicate , R1 and R2 must advertise their directly connected networks (192.168.1.0/24) in OSPF using the network command or by redistributing connected routes into OSPF.
* Command example:
makefile
CopyEdit
R1:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
R2:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
* This would allow R1 to learn about PC2 ' s network and R2 to learn about PC1 ' s network , enabling communication.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* HCIP-Datacom Official Certification Guide , Chapter on OSPF Network Design and Troubleshooting .
* Huawei Datacom Training Materials , Section on OSPF Inter-Area and External Route Advertisements .
* Huawei Datacom Configuration Guide , Command Reference for OSPF network advertisement and route redistribution .
NEW QUESTION # 104
......
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