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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Objectives
IPv6 and Advanced IP Technologies	- IPv6 deployment 1. IPv6 addressing and transition
Network Automation and Programmability	- SDN and automation 1. NETCONF/YANG basics 2. Network automation tools
Data Center and Virtualization Technologies	- VXLAN and overlay networks 1. Data center network virtualization
WAN and VPN Technologies	- MPLS fundamentals 1. MPLS LDP and forwarding 2. VPN technologies
Routing and Switching Technologies	- IP routing protocols 1. BGP 2. IS-IS basics 3. OSPF - Switching technologies 1. VLAN and STP 2. Ethernet switching mechanisms
Enterprise Network Architecture	- Network design principles 1. Scalability and high availability design 2. Hierarchical network architecture
Network Security and QoS	- Security mechanisms 1. ACL and traffic control 2. Basic network security design - QoS mechanisms 1. Traffic classification and shaping

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Huawei HCIE-Datacom V1.0 Sample Questions (Q314-Q319):

NEW QUESTION # 314
The IS-IS Level-1 neighbor relationship is not established between R3 and R4. Referring to the following information, what is the possible cause?

A. The IIH authentication between R3 and R1 fails.
B. The area IDs of R3 and R4 are different.
C. The circuit types of the interfaces connecting R3 and R4 do not match.
D. The IS-IS levels of R3 and R4 do not match.

Answer: B

Explanation:
From the IS-IS error output, the key error is:
Mismatched Area Addr(L1): 13
This clearly indicates that the area addresses are different, which prevents the Level-1 adjacency from forming.
Why is Option D Correct?
IS-IS Level-1 routers must have the same area ID to form an adjacency.
Since the log shows a mismatched area address, the adjacency fails at Level-1.
If R3 and R4 were Level-2 routers, they could form an adjacency even with different area IDs.
Why Are the Other Options Incorrect?
❌ Option A: No authentication failure is reported.
❌ Option B: No "Mismatched Level" errors appear, so their levels are compatible.
❌ Option C: No "Bad Circuit Type" errors indicate mismatched circuit types.
Thus, the correct answer is D.
📖 Reference: Huawei HCIE Datacom - IS-IS Neighbor Troubleshooting

NEW QUESTION # 315
The following description of the LDPLSP establishment process is correct?

A. By default, LSRs are for the same FEC, and the received tag mappings can only come from the optimal next hop, not from the non-optimal next hop.
B. In the DoD mode of label publishing, for a specific FEC, the LSR does not need to obtain a label request message from upstream to distribute the label.
C. The process of establishing a LSP is actually to bind the FEC to the tag and advertise this binding to the LSP upstream LSR process.
D. When a network topology change causes the next hop neighbor to change, the free label keep method is used. LSR can quickly rebuild the LSP by directly using the labels sent by the original non-optimal next-hop neighbor. Liberal needs more memory and tag space.

Answer: C,D

NEW QUESTION # 316
K company has two types of network services: UDP-based real-time video streaming services and TCP-based FTP download services. The company's network administrator often receives complaints that the FTP download speed is slow or unstable. What are the possible causes?

A. The device limits the FTP traffic rate to a small value.
B. The device uses the tail drop technology. As a result, global TCP synchronization affects the FTP rate.
C. The device performs PQ scheduling for FTP services and WFQ scheduling for video services. As a result, the FTP service bandwidth is preempted.
D. The video service has a higher priority and preempts the bandwidth of the FTP service.

Answer: B,D

Explanation:
Comprehensive and Detailed Explanation:
Key Factors Affecting FTP Performance:
Tail Drop and TCP Synchronization (A)#
Tail Dropcauses TCPglobal synchronization, reducing FTP speeds drastically when congestion occurs.
Since FTP isTCP-based, packet loss due to tail drop forcesTCP retransmissions, further degrading performance.
Priority Preemption by Video Traffic (D)#
UDP-based real-time video trafficis often prioritized overTCP-based trafficto avoid jitter and packet loss.
If video traffic hashigher QoS priority, FTP bandwidth may bepreempted, leading toslow speeds.
Incorrect Options:
#Option B:PQ scheduling typically prioritizes latency-sensitive traffic (VoIP), but this scenario does not mention priority queuing for FTP.
#Option C:No information about an explicitrate limiton FTP traffic.
#Reference:Huawei HCIE Datacom - QoS and Congestion Control

NEW QUESTION # 317
The following statement about IPv6 Over VXLAN is wrong as ?( Single choice questions).

A. IPv6 over VXLAN solves the problem of insufficient IP address resources for end tenants.
B. IPv6 over VXLAN means that the Overlay network of the VXLAN is an IPv6 network.
C. The tunnel between VXLAN Layer 2 and Layer 3 gateways is an IPv4 network.
D. IPv6 Over VLANs do not generate ND table entries.

Answer: D

NEW QUESTION # 318
What is wrong with the following statement about digital certificates?

A. Digital certificates contain public key information.
B. Even if two PRI entities are not in the same CA system, authentication can be completed as long as both parties can recognize each other's CA.
C. Authentication fails when the peer certificate is received within the validity period, but the device itself is in the wrong time if it is not within the validity period of the certificate.
D. Digital signatures guarantee the integrity of digital certificates.

Answer: B

NEW QUESTION # 319
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