H35-210_V2.5 Huawei HCIA-Access V2.5 Exam Free Practice Exam Questions (2025 Updated)

A/B: Basic network checks (IP configuration and physical connectivity).

C: Inband and outband NMS IPs must be in different subnets to avoid conflicts.

Double-Tagged VLANs :

Double-tagging involves adding two VLAN tags to a packet:

Inner VLAN Tag : Identifies users or devices.

Outer VLAN Tag : Identifies services or networks.

VLAN Attributes :

QinQ : Adds an outer VLAN tag to an already tagged packet, enabling double-tagging.

Stacking : Similar to QinQ but less commonly used.

Common : Supports only single-tag VLANs.

Scenario Analysis :

The university requires double-tagging for user and service identification.

The QinQ attribute is specifically designed for this purpose.

Why C?

The QinQ attribute supports double-tagging, making it the correct choice for this scenario.

Thus, the correct answer is C .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.

IEEE 802.1ad QinQ Standards .

DHCP Overview :

DHCP (Dynamic Host Configuration Protocol) is used to automate the assignment of IP addresses and other network configuration parameters (e.g., subnet mask, default gateway, DNS servers).

It centralizes IP address management, reducing manual configuration errors.

Key Components :

DHCP Server : Allocates IP addresses and other parameters to clients.

DHCP Client : Requests and receives configuration from the DHCP server.

DHCP Relay : Forwards DHCP packets between clients and servers in different subnets.

Conflict Detection Mechanism :

DHCP includes a mechanism to detect and resolve IP address conflicts.

Before assigning an IP address, the DHCP server sends an ICMP Echo Request to check if the address is already in use. If no response is received, the address is considered available.

Why TRUE?

The statement accurately describes the functionality of DHCP, including centralized management, parameter distribution, and conflict detection.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: DHCP Protocol.

RFC 2131: DHCP Protocol Specification .

ODN loss factors:

A: Intrinsic fiber attenuation (~0.2 dB/km).

B: Splitter insertion loss (e.g., 1:32 splitter ≈17 dB).

D/E: Connector/splice losses (0.1–0.5 dB per point).

Huawei OLT supports:

Transparent: No modification.

Translate: Replaces the VLAN ID.

Let us analyze each statement carefully:

Option A :

Incorrect : In inter-VLAN communication, hosts in different VLANs cannot directly communicate with each other because VLANs are isolated at Layer 2. Communication between VLANs requires a Layer 3 device (e.g., a router or Layer 3 switch).

Hosts do not learn the MAC addresses of devices in other VLANs. Instead, they communicate through a gateway (router or VLANIF interface), and the gateway handles the forwarding.

Option B :

Correct : A VLAN is indeed a broadcast domain . Devices within the same VLAN share the same broadcast traffic, while devices in different VLANs do not.

Option C :

Incorrect : A VLAN is not a collision domain. Collision domains are defined at the data link layer (Layer 2) and are associated with individual switch ports or hubs. VLANs are logical groupings that span multiple switch ports and do not represent collision domains.

Option D :

Correct : VLANIF interfaces (also called Switch Virtual Interfaces, SVIs ) are logical Layer 3 interfaces configured on switches to enable inter-VLAN routing. These interfaces allow communication between VLANs by acting as gateways for each VLAN.

Thus, the incorrect statements are A and C .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Fundamentals.

Inter-VLAN Routing and VLANIF Interfaces by Huawei.

Stacking VLAN (QinQ): Adds an outer VLAN tag (double tagging).