Free Practice Questions for Huawei H35-210_V2.5 Exam

Firewall Settings (Option A) :

Incorrect firewall settings on the PC can block outbound HTTP/HTTPS traffic, preventing access to web pages.

Browser Settings (Option B) :

Misconfigured browser settings (e.g., proxy settings in Internet Explorer) can prevent the browser from connecting to websites.

Upper-Layer Device Configuration (Option C) :

Incorrect configurations on upper-layer devices (e.g., NAT, routing, or DNS settings) can prevent proper communication between the user and external networks.

Website Server Fault (Option D) :

If the issue affects all web pages , it is unlikely to be caused by a single website server being faulty. This option is irrelevant in this scenario.

Why A, B, C?

These options directly address potential issues that could prevent access to all web pages after successful authentication.

Thus, the correct answers are A, B, C .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: Broadband Troubleshooting.

Broadband Access Network Fault Analysis by Huawei.

Dynamic Bandwidth Assignment (DBA) :

DBA is a key mechanism in GPON systems that dynamically allocates upstream bandwidth among ONUs based on their traffic demands.

Functions of DBA :

To provide high-bandwidth services : DBA ensures that ONUs can access sufficient bandwidth for high-priority or bursty traffic, such as video streaming or large file uploads.

To avoid optical signal conflicts : This is achieved through TDMA (Time Division Multiple Access), not directly by DBA. DBA focuses on bandwidth allocation rather than collision avoidance.

To improve upstream bandwidth utilization : By dynamically allocating bandwidth, DBA ensures efficient use of the limited upstream capacity of a PON port.

To dynamically allocate upstream bandwidth : DBA operates in real-time, adjusting bandwidth allocations within microseconds or milliseconds to meet changing traffic demands.

Why A, C, D?

These options accurately describe the functions of DBA. Option B is incorrect because avoiding optical signal conflicts is handled by TDMA, not DBA.

Thus, the correct answers are A, C, D .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON DBA Mechanism.

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

GE (PoE): Powers the AP.

GE: Connects to PC, IP camera, and IPTV.

Querying Receive Optical Power :

Monitoring the receive optical power of an ONU is critical for troubleshooting and ensuring proper signal strength.

Command Analysis :

display ont optical-info : Displays detailed optical information for the ONU, including receive and transmit optical power.

display pon optical-info : Provides optical information for the entire PON port, not specific to individual ONUs.

display board : Shows hardware status of the OLT board, not optical power details.

display port state : Displays the operational state of ports, not optical power information.

Why A?

The display ont optical-info command is specifically designed to query the optical power of an individual ONU.

Thus, the correct answer is A .

References:

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

OLT Command Reference Guide by Huawei.

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 .

Traffic Classification Overview :

Traffic classification is used to identify and prioritize different types of traffic on the network.

The OLT (Optical Line Terminal) supports various methods for classifying traffic based on VLAN tags, packet priorities, and service encapsulation.

Supported Technologies :

User-side VLAN : Classifies traffic based solely on VLAN tags. This is a basic method but does not consider packet priority or service type.

VLAN + user-side packet priority : Combines VLAN tags with packet priority (e.g., DSCP or 802.1p values) for more granular classification.

VLAN + user-side service encapsulation : Combines VLAN tags with service-specific encapsulation, but this is less commonly used.

User-side service encapsulation : Focuses only on service encapsulation without considering VLAN tags or packet priority.

Why B?

The combination of VLAN tags and user-side packet priority provides the most effective and widely supported traffic classification method. It allows the OLT to classify traffic based on both VLAN membership and priority levels, ensuring efficient QoS (Quality of Service) management.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: Traffic Classification.

GPON Traffic Management 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.