Huawei H35-210_V2.5 Practice Test - Questions Answers, Page 5

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 .

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 .

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

OLT Configuration Guide by Huawei.

QinQ Overview :

QinQ (IEEE 802.1ad) is a double-tagging mechanism that adds an outer VLAN tag to an already tagged packet.

It is commonly used in carrier networks to extend VLAN capacity and support hierarchical VLAN architectures.

VLAN Types :

Sub VLAN : Part of a Super VLAN configuration, used for IP address conservation. Does not support QinQ.

Common VLAN : Supports only single-tag VLANs. Does not support QinQ.

Super VLAN : Aggregates multiple Sub VLANs for IP address sharing. Does not support QinQ.

Smart VLAN : Specifically designed to support advanced features like QinQ and VLAN stacking.

Why D?

Smart VLAN is the only VLAN type that supports QinQ and VLAN stacking, making it the correct choice.

Thus, the correct answer is D .

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.

IEEE 802.1ad QinQ Standards .

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 .

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

OLT Configuration Guide by Huawei.

Testing Board Reset :

Testing the reset functionality of an OLT board ensures that the board can recover from failures or configuration changes.

Methods for Testing Reset :

Hot Swap : Physically removing and reinserting the board tests its ability to initialize and function after a reset.

RESET Button : Pressing the physical RESET button on the board forces a hardware reset, verifying recovery capabilities.

Reset Command : Using CLI commands (e.g., reset board) resets the board remotely, allowing verification of software-based recovery.

Why D?

All three methods are valid ways to test the reset functionality of an OLT board. Each method addresses different scenarios and ensures comprehensive testing.

Thus, the correct answer is D .

HCIA Huawei ACCESS Official Documentation , Chapter: OLT Maintenance.

OLT Hardware and Software Reset Procedures by Huawei.

File Transfer Protocols :

FTP (File Transfer Protocol) : Provides reliable file transfer with high speed and ease of use.

TFTP (Trivial File Transfer Protocol) : Lightweight but lacks security and reliability features.

SFTP (Secure File Transfer Protocol) : Secure but slower due to encryption overhead.

Recommendation for Upgrades :

During access network upgrades, large files (e.g., firmware images) need to be transferred quickly and reliably.

FTP is recommended because it balances speed, reliability, and ease of use.

Why TRUE?

The statement correctly identifies FTP as the recommended protocol for file transfers during upgrades.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: Network Upgrade Procedures.

File Transfer Protocols Comparison by Huawei.

ONU States Overview :

The display ont info command provides detailed information about the status of an ONU (Optical Network Unit), including its operational state.

Key States :

Online : Indicates that the ONU is registered, authenticated, and actively communicating with the OLT. This is the desired state for normal operation.

Active : Refers to the ONU being powered on but not necessarily fully registered or authenticated.

Match : Indicates that the ONU configuration matches the OLT's expected configuration, but this does not guarantee online status.

Offline : Indicates that the ONU is not registered or communicating with the OLT.

Why A?

The Online state explicitly confirms that the ONU is registered, authenticated, and functioning properly within the network.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: ONU Management.

OLT Command Reference Guide by Huawei.

Upstream Transmission Overview :

The MA5800 is a next-generation OLT platform that supports multiple upstream transmission options, including 10 GE (Gigabit Ethernet) and GE (Gigabit Ethernet).

Default Configuration :

By default, the upstream ports on the MA5800 are configured for 10 GE transmission. However, administrators can adjust the speed using the speed command to match the requirements of the interconnected device.

Matching Port Rates :

For successful communication, the upstream port rate on the MA5800 must match the rate of the port on the upper-layer device (e.g., switch or router). Mismatched rates can lead to communication failures.

Why TRUE?

The statement accurately describes the default configuration and the importance of matching port rates to ensure proper communication.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: MA5800 Upstream Configuration.

MA5800 Product Manual by Huawei.

Adding an ONT to the OLT :

Adding an ONT (Optical Network Terminal) to the OLT involves several steps, but the critical step is registering the ONT and binding it to the appropriate profile.

Key Steps :

DBA Profile : Configures dynamic bandwidth allocation for the ONT but is not mandatory during initial registration.

ONT Service Profile : Defines services (e.g., Internet, IPTV) but is applied after the ONT is added.

Add ONT and Bind Profile : Registers the ONT with the OLT and binds it to a pre-configured line profile. This is the essential step for adding an ONT.

ONT Line Profile : Configures the VLAN and service parameters but is created before adding the ONT.

Why C?

The most critical action when adding an ONT is to register it and bind it to a profile, ensuring it is recognized and operational within the network.

Thus, the correct answer is C .

HCIA Huawei ACCESS Official Documentation , Chapter: ONT Registration.

OLT Command Reference Guide by Huawei.