Pass the Huawei HCIP-Access H35-210_V2.5 Questions and answers with CertsForce

GPON Wavelengths :

GPON networks use specific wavelengths for upstream and downstream transmission:

Downstream (OLT to ONU) : 1490 nm.

Upstream (ONU to OLT) : 1310 nm.

Optional CATV overlay : 1550 nm (used for video services).

Why 1490 nm?

The ITU-T G.984.x standards specify 1490 nm as the wavelength for downstream data transmission in GPON networks. This wavelength is chosen for optimal performance in fiber-optic communication.

Other Options :

850 nm : Used in multimode fiber for short-distance communication, not in GPON.

1310 nm : Used for upstream transmission in GPON.

1550 nm : Optional wavelength for CATV overlay, not for standard downstream data.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON Wavelengths.

ITU-T G.984.x Standards for GPON .

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.

NMS configuration requires:

A: Device name for identification.

B: SNMP community string for authentication.

C: IP address for communication.

D (Incorrect): Routing is handled by network devices, not NMS parameters.

Optical Module Classes :

Optical modules are classified based on their optical loss budget, which determines the maximum distance they can support over fiber-optic cables.

Class Comparison :

CLASS B : Supports shorter distances with lower optical loss budgets.

CLASS B+ : Provides a higher optical loss budget than CLASS B, supporting longer distances.

CLASS C+ : Offers an even higher optical loss budget, suitable for extended-reach deployments.

CLASS C++ : Provides the highest optical loss budget, enabling the longest reach and greatest flexibility in network design.

Why B?

CLASS C++ has the most sufficient optical loss budget, making it the best choice for scenarios requiring maximum reach and reliability.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: Optical Module Specifications.

ITU-T G.984.x Standards for GPON .