Huawei HCIA-Access V2.5 Exam H35-210_V2.5 Exam Dumps: Updated Questions & Answers (September 2025)

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 .

ONU Activation Overview :

When an ONU (Optical Network Unit) is added to the OLT, it may initially be in a deactivated state (Control flag = deactive).

To bring the ONU online, it must be explicitly activated using the ont activate command.

Command Usage :

The ont activate command is issued in GPON port mode to activate the ONU. Once activated, the ONU transitions to the Online state and begins normal operation.

Why TRUE?

The statement accurately describes the procedure for activating an ONU when the control flag is deactive.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: ONU Activation.

OLT Command Reference Guide by Huawei.

Default Behavior of ONUs :

By default, ONUs (Optical Network Units) connected to the same PON port of a Huawei OLT are isolated at Layer 2 .

This isolation ensures that ONUs cannot communicate directly with each other, even if they belong to the same service VLAN.

Why FALSE?

The statement incorrectly claims that ONUs can communicate with each other at Layer 2 by default. In reality, Layer 2 isolation is a security feature designed to prevent unauthorized communication between ONUs.

Enabling Communication :

If Layer 2 communication between ONUs is required, it must be explicitly enabled through configuration (e.g., by disabling Layer 2 isolation).

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON Security Features.

OLT Configuration Guide by Huawei.

Let us analyze each option:

Option A : Incorrect. A route does not include MAC addresses. It typically consists of a destination network, subnet mask, next-hop address, and outgoing interface.

Option B : Correct. IP routes are essential for guiding the forwarding of IP packets from the source to the destination. Routers use routing tables to determine the best path for packet delivery.

Option C : Incorrect. Routing is a concept at the network layer (Layer 3) of the OSI model, not the data link layer (Layer 2).

Option D : Incorrect. A route does not require the source address. It only needs the destination network, subnet mask, and next-hop information.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: IP Routing Basics.

Routing Fundamentals in IP Networks by Huawei.

2.4 GHz Frequency Band :

The 2.4 GHz band is divided into 14 overlapping channels, each 20 MHz wide.

However, only three channels (e.g., Channels 1, 6, and 11 in North America) are non-overlapping and can be used simultaneously without interference.

Why TRUE?

By using non-overlapping channels (e.g., 1, 6, and 11), wireless networks can operate concurrently without significant interference.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: WLAN Frequency Bands.

IEEE 802.11 Standards for WLAN .

VLAN Tag Translation :

VLAN tag translation is used to modify VLAN tags in packets as they pass through the OLT.

The tag-transform parameter determines how VLAN tags are handled during service flow creation.

Behavior of tag-transform = default :

When tag-transform is set to default, the OLT applies predefined rules for VLAN tag conversion based on the SVLAN (Service VLAN) attributes.

These rules vary depending on the SVLAN type (e.g., Common, QinQ, Stacking), resulting in different behaviors.

Why TRUE?

The statement accurately reflects the behavior of the tag-transform parameter when set to default. Different SVLAN attributes lead to different tag conversion rules.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Tag Translation.

OLT Configuration Guide by Huawei.

Testing Optical Transmit Power :

Testing the optical transmit power of an ONU involves measuring the power output at its upstream port.

Key Considerations :

Wavelength : The upstream wavelength for GPON/XGS-PON is 1310 nm , so selecting this wavelength is correct.

Power Meter Type : A common power meter is not suitable for testing optical power in live networks. Instead, a specialized optical power meter or an OLT-based monitoring tool should be used.

Why FALSE?

Using a common power meter is incorrect because it may not provide accurate readings or could disrupt network operation.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: ONU Optical Testing.

Optical Power Measurement Procedures by Huawei.