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Huawei HCIE-Datacom V1.0 Sample Questions (Q241-Q246):

NEW QUESTION # 241
In the Huawei SD-WAN Solution, which of the following routing protocols is used to advertise VPN routes between CPEs?

Answer: C

Explanation:
BGP in Huawei SD-WAN
Huawei SD-WAN uses BGP (Border Gateway Protocol) as the primary routing protocol to exchange VPN routes between Customer Premises Equipment (CPEs) and the controller.
✅ Why BGP is Used in SD-WAN?
Scalability: BGP can handle a large number of VPN routes.
Policy-Based Routing: BGP allows traffic engineering and policy control across SD-WAN tunnels.
Multiprotocol Support: Huawei SD-WAN uses MP-BGP to exchange IPv4, IPv6, and VPNv4 routes.


NEW QUESTION # 242
In addition to stateless address autoconfiguration, IPV6 devices can also obtain addresses, gateways, DNS, and other information through DHCPv6

Answer: A


NEW QUESTION # 243
R1 receives a common IPv6 packet from the CE and generates a packet carrying the SRH (Segment Routing Header), as shown in the figure. The packet is forwarded along the path R1 → R2 → R3 → R4. Identify the node type of each device based on their role in SRv6 processing.

Answer:

Explanation:


NEW QUESTION # 244
Which of the following routing tools is unique to BGP?

Answer: D


NEW QUESTION # 245
An LSR (Label Switching Router) supports various label retention modes. Which of the following statements regarding the liberal mode are correct?

Answer: B,C

Explanation:
Understanding MPLS Label Retention Modes
In MPLS (Multiprotocol Label Switching), a Label Switching Router (LSR) can operate in one of two label retention modes:
1️⃣ Liberal Label Retention Mode (LLRM)
Stores all labels received from neighbors, even if they are not immediately used.
Advantage: Fast convergence during link failures.
Disadvantage: Consumes more memory & label space.
2️⃣ Conservative Label Retention Mode (CLRM)
Only keeps labels for the best next-hop path.
Advantage: Saves memory & label space.
Disadvantage: Slower convergence when topology changes.
Why are C and D Correct?
✅ C. An LSR reserves all labels distributed by its neighbor.
Correct: In Liberal Mode, the router accepts and stores all labels received, even for non-best paths.
✅ D. The liberal mode requires more memory and label space.
Correct: Since the router keeps all labels, it requires higher memory & storage.
Why are A and B Incorrect?
❌ A. An LSR retains labels from a neighboring LSR only when the neighbor is its next hop.
Incorrect: This describes Conservative Mode, not Liberal Mode.
❌ B. This label retention mode saves memory and label space.
Incorrect: Liberal Mode consumes more memory, not less.
Real-World Application
Liberal Mode is used in large-scale MPLS networks where fast failover is critical.
Conservative Mode is preferred in memory-constrained environments.
✅ Reference: Huawei HCIE-Datacom Study Guide - MPLS Label Retention Modes


NEW QUESTION # 246
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