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Huawei H12-891_V1.0 Exam is a challenging exam that requires candidates to have a deep understanding of data communication technologies and solutions. Candidates must have a strong foundation in networking concepts, including OSI model, TCP/IP, and Ethernet. They must also have experience working with network devices, such as routers, switches, and firewalls, and be familiar with network protocols, such as BGP, OSPF, and MPLS.

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Huawei HCIE-Datacom V1.0 Sample Questions (Q144-Q149):

NEW QUESTION # 144
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 video service has a higher priority and preempts the bandwidth of the FTP service.
B. The device limits the FTP traffic rate to a small value.
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 device uses the tail drop technology. As a result, global TCP synchronization affects the FTP rate.

Answer: A,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 # 145
IsIS IPv6 cost 50 is configured under the interface, and the meaning of the command is ?

A. The LEVEL-1 cost of the interface's IS-IS IPv6 is 50
B. The LEVEL-1 and Leve1-2 costs of the INTERFACE's IS-IS IPv6 are both 60
C. The LEVEL-1 and Level-2 costs of the interface's IS-IS IPv6 are 50
D. The LEVEL-2 cost of the interface's IS-IS IPv6 is 50

Answer: C

NEW QUESTION # 146
R3 is not established with the RI's IS-IS neighbor, and according to the information in this figure, the possible cause is ?

A. R3 and R1
B. R3 does not match the IS-Level of R1
C. R3 and R1 interconnection ports circuit-type do not match the lH authentication of
D. R3 duplicates the System ID of R1

Answer: C

NEW QUESTION # 147
Regarding the Stub region and the NSSA region of the OSPF protocol , the following statement is incorrect with a single choice

A. Both the Stub region and the NSSA region allow injection of Type3 LSA
B. Type5 LSA injection is not allowed in the Stub region, while Type5LSA injection is allowed in the NSSA region
C. Neither the Stub region nor the NSSA region allows injection of Type4 LSA
D. Type7LSA injection is not allowed in the Stub region, while Type7LSA injection is allowed in the NSSA region

Answer: B

NEW QUESTION # 148
The correct description about the prefix list is:

A. The prefix list can be used to filter packets
B. The prefix list is used to filter P prefixes and can match both prefix numbers and prefix lengths
C. The prefix list cannot be used for packet filtering
D. The prefix list is used to filter IP prefixes, and cannot match both the prefix number and the prefix length

Answer: B,C

NEW QUESTION # 149
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