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Exam Huawei H12-891_V1.0 Pass4sure, Reliable H12-891_V1.0 Test Questions

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Becoming certified in Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Exam can provide many benefits to IT professionals. HCIE-Datacom V1.0 certification demonstrates to potential employers that a candidate has the expertise to design and manage complex data communication networks, which can lead to career advancement opportunities and higher salaries. Additionally, certified professionals gain access to Huawei's global community of experts, which provides networking opportunities and access to the latest industry trends and best practices.

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Huawei HCIE-Datacom V1.0 Sample Questions (Q177-Q182):

NEW QUESTION # 177
The Next Header field information exists only in the header of an IPv6 message and is used to indicate whether an extended header exists for IPv6

A. False
B. True

Answer: A

NEW QUESTION # 178
What are the characteristics of Syslog information?

A. The transmission of Syslog messages is secure
B. The transmission of Syslog messages is not secure
C. The transmission of Syslog messages is not acknowledgable
D. The transmission of Sysiog messages is reliable
E. The transmission of Syslog messages is unreliable
F. The transmission of Syslog messages is confirmable

Answer: B,C,E

NEW QUESTION # 179
If a DR needs to be elected between multicast routers running PIM-SM to be responsible for the sending and receiving of source or member multicast data, which one is described correctly below for the DR election rule?

A. PIM routers with long interface masks are elected dr.
B. Compare the DR priority first; With the same priority, you need to compare the interface IP addresses of the PIM routers to elect dr
C. PIM routers with small IP addresses are elected DR. PIM routers with low
D. DR priority values are elected DR.

Answer: B

NEW QUESTION # 180
Which of the following statements are correct about the command:
ping -aX -cY -sZ -vpn-instance M 10.5.16.2

A. The ping packets belong to VPN instance M.
B. During the ping operation, the quantity of ICMP Request packets is Y.
C. The source IP address of the ping packets is X.
D. The size of each ICMP Request packet for the ping operation is Z bytes.

Answer: A,B,C,D

Explanation:
Understanding the Command Components:
This is a Huawei CLI command used for diagnosing connectivity within a VPN instance in an MPLS network.
* ping -aX # Specifies the source IP address (X) of the ping packets.
* -cY # Specifies the number of ICMP Echo Request packets to send (Y).
* -sZ # Defines the size (in bytes) of each ICMP Echo Request packet (Z).
* -vpn-instance M # Specifies the VPN instance (VRF) M to which the ping packets belong.
Why are all options correct?
# A. The source IP address of the ping packets is X.
* The -aX option forces the ping to originate from IP X instead of the default interface IP.
# B. The ping packets belong to VPN instance M.
* The -vpn-instance M option ensures the ping is sent within VPN instance M, allowing verification of MPLS L3VPN routing.
# C. During the ping operation, the quantity of ICMP Request packets is Y.
* The -cY parameter sets the number of ICMP Echo Requests to be sent, making Y the total count.
# D. The size of each ICMP Request packet for the ping operation is Z bytes.
* The -sZ parameter defines packet size, helping to test MTU (Maximum Transmission Unit) issues.
Real-World Application:
* Verifying MPLS VPN connectivity: Ensure customer networks are reachable within separate VRFs.
* Testing MTU & fragmentation: Using -sZ, operators can check if packet fragmentation occurs.
* Debugging asymmetric routing issues: By forcing -aX, engineers can trace return paths.
# Reference: Huawei HCIE-Datacom Official Guide - MPLS VPN Troubleshooting & Ping Options

NEW QUESTION # 181
Exhibit:

The following figure shows the inter-AS MPLS VPN Option C (solution 2). RRs are deployed, and no traffic passes through the RRs during forwarding. If a data packet sent from PE2 to 192.168.1.1 carries two labels, which of the following statements about the two labels are correct?

A. V1 is allocated by PE1.
B. T1 is allocated by P2.
C. V1 is allocated by P2.
D. T1 is allocated by RR2.

Answer: A,B

Explanation:
Understanding Inter-AS MPLS VPN Option C (Solution 2)
In MPLS L3VPN Inter-AS Option C, the Route Reflectors (RRs) are used for VPN route distribution but do not participate in data forwarding. The traffic forwarding path is based on MPLS labels assigned at different routers.
Each data packet carries two MPLS labels:
* Transport Label (T1) - Used for forwarding within the backbone.
* VPN Label (V1) - Used for VPN route identification.
Breaking Down the Labels:
# VPN Label (V1) - Allocated by PE1
* V1 (Inner Label) is the VPN label assigned by the egress PE router (PE1).
* This label ensures that when the packet reaches PE1, it knows how to forward the traffic to CE1 (192.168.1.1).
# Transport Label (T1) - Allocated by P2
* T1 (Outer Label) is the transport label assigned by P2 to forward the packet across the AS core.
* This label ensures the packet reaches the next-hop router (ASBR-PE1 in AS100).
Why Are the Other Options Incorrect?
# A. "T1 is allocated by RR2" (Incorrect)
* RR2 is used only for route reflection; it does not participate in label allocation or forwarding.
# D. "V1 is allocated by P2" (Incorrect)
* P2 is an intermediate router and does not allocate VPN labels.
* VPN labels are always assigned by the egress PE router (PE1 in AS100).
# Reference: Huawei HCIE Datacom - MPLS L3VPN Inter-AS Option C

NEW QUESTION # 182
......

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