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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Certification Exam is an advanced level certification exam that is designed for professionals who specialize in data communication technologies. H12-891_V1.0 exam is intended to test the knowledge, skills, and expertise of individuals in designing, implementing, and troubleshooting complex data communication networks. HCIE-Datacom V1.0 certification exam covers various topics, including network architecture, network protocols, network security, network virtualization, and data center technologies.
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NEW QUESTION # 294
Which of the following statements is incorrect about the user authentication points on the network?
Answer: C
Explanation:
Understanding User Authentication Points in a Network
Authentication points can be deployed at different network layers based on security and scalability needs:
# Access Layer Authentication:
* Ensures high security & granular control (user-level authentication).
* Preferred in high-security enterprise networks.
# Aggregation or Core Layer Authentication:
* Reduces authentication overhead but provides less granular control.
* Suitable for large-scale networks where authentication load needs to be balanced.
Analysis of the Answer Choices:
# A. Deploying user authentication points at the access layer achieves granular permission management and high network security.
* Correct: Provides fine-grained control per user and prevents unauthorized access.
# B. Moving user authentication points from the access layer to the aggregation or core layer greatly reduces the number of user authentication points, thereby effectively mitigating the pressure on the AAA server.
* Correct: Fewer authentication points mean less load on the AAA server.
# C. Deploying user authentication points at the access layer has both advantages and disadvantages when compared to doing so at the aggregation or core layer. Policy association can be applied if user authentication points are deployed at the access layer.
* Correct: Policy-based authentication is best applied at the access layer for granular control.
# D. When user authentication points are moved from the access layer to the aggregation layer, MAC address authentication for users may fail.
* Incorrect: MAC authentication works at both layers, but policy adjustments may be needed.
# Reference: Huawei HCIE-Datacom Guide - User Authentication Strategies in Enterprise Networks
NEW QUESTION # 295
A medium-sized campus network manages the network through the SNMP protocol, and the campus is highly network-safe, so which version of SNMP is recommended for management?
Answer: C
NEW QUESTION # 296
In the forwarding table of the switch, a MAC address can correspond to only one outlet at a time
Answer: B
NEW QUESTION # 297
BGP Link State (BGP-LS) introduces a new NLRI into BGP. The NLRI carries link, node, topology prefix, and other information, and is also referred to as the link state NLRI.
Answer: B
Explanation:
Understanding BGP Link State (BGP-LS)
๐น What is BGP-LS?
BGP-LS (BGP Link-State) is an extension of BGP that allows routers to exchange network topology information via Link-State NLRI.
Helps SDN controllers and path computation elements (PCEs) make intelligent routing decisions.
๐น What Does BGP-LS Advertise?
โ
Node Information - Router IDs, Loopbacks
โ
Link Information - Bandwidth, Delay, Cost
โ
Prefix Information - Network Subnets
โ
Topology Information - Full network graph
Why is the Answer TRUE?
โ
BGP-LS introduces a new NLRI format for advertising link-state information.
โ
NLRI (Network Layer Reachability Information) is used to distribute topology data to SDN controllers.
โ
It improves path optimization by enabling centralized traffic engineering decisions.
Real-World Application:
SDN-Based Traffic Engineering: Used in Segment Routing (SR) networks for centralized path selection.
MPLS TE (Traffic Engineering): Optimizes network paths dynamically based on real-time link-state data.
โ
Reference: Huawei HCIE-Datacom Guide - BGP Link-State (BGP-LS) Fundamentals
NEW QUESTION # 298
In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.
Answer: B
Explanation:
In MPLS LDP (Label Distribution Protocol), label retention modes control how labels are stored in the Label Forwarding Information Base (LFIB).
DU Label Advertisement Mode (Downstream Unsolicited):
Labels are advertised to all LDP peers without a request.
The receiving router decides which label to use for forwarding.
Liberal vs. Conservative Label Retention:
โ
Liberal Label Retention Mode (Correct Answer)
All received labels from all LDP peers are stored.
Even if a peer is not the optimal next hop, its label is retained.
Allows faster convergence during failures.
โ Conservative Label Retention Mode
Only the label from the best next-hop peer is stored.
Reduces memory usage but can slow down convergence in case of failure.
Reference from Huawei HCIE-Datacom Documentation:
Huawei MPLS LDP Configuration Guide - Liberal vs. Conservative Label Retention HCIE-Datacom Training Material - Label Advertisement in MPLS Networks
NEW QUESTION # 299
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