Free Huawei HCIA-Access V2.5 H35-210_V2.5 Exam Questions

ONT Line Profile Overview :

An ONT line profile defines the mapping and configuration of services for an ONU (Optical Network Unit) on the OLT.

Key Parameters :

Mapping between GEM ports and data packets : Specifies how data packets are mapped to GEM (GPON Encapsulation Method) ports for transmission.

GEM ports : Logical ports used to encapsulate and transmit data over the GPON network.

T-CONT (Transmission Containers) : Allocates upstream bandwidth for different service flows.

Number of Ethernet ports on the ONT : This is a hardware attribute of the ONT and is not defined in the line profile.

Why A, B, C?

These parameters are directly related to the configuration of services and are included in the ONT line profile.

The number of Ethernet ports is unrelated to the line profile and is determined by the ONT hardware.

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

HCIA Huawei ACCESS Official Documentation , Chapter: ONT Line Profiles.

GPON Service Configuration Guide by Huawei.

The first 24 bits (OUI) of a MAC address are purchased by manufacturers from the IEEE. The remaining 24 bits are assigned by the manufacturer and are not customizable by end-users. While some advanced systems allow temporary MAC address changes, the statement isfalsebecause the OUI is fixed and tied to the manufacturer.

PON Network Components :

OLT (Optical Line Terminal) : Central office equipment that connects to the core network.

ODN (Optical Distribution Network) : Consists of optical fibers, splitters, and connectors that distribute signals between the OLT and ONUs.

ONU (Optical Network Unit) : End-user equipment that connects to customer devices.

OAM (Operations, Administration, and Maintenance) :

OAM refers to a set of tools and protocols used for managing and maintaining the network. It is not a physical component of the PON system.

Why A?

OAM is a function or process, not a physical part of the PON network system.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: PON Network Components.

GPON System Architecture by Huawei.

A:Weak optical power prevents ONT registration.

B:Auto-find must be enabled for ONT discovery.

D:Excessive optical power saturates the receiver.

VLAN link types define how VLAN traffic is handled on switch ports. The three common VLAN link types are:

Access Ports :

Used to connect end devices (e.g., PCs, printers) to the switch.

An access port belongs to only one VLAN and carries untagged traffic for that VLAN.

Example: A PC connected to an access port in VLAN 10 sends and receives untagged traffic.

Trunk Ports :

Used to connect switches or routers to carry traffic for multiple VLANs.

Trunk ports tag traffic with VLAN IDs using IEEE 802.1Q encapsulation.

Example: A trunk port connecting two switches carries tagged traffic for VLANs 10, 20, and 30.

Hybrid Ports :

A hybrid port can carry both tagged and untagged traffic.

It is flexible and can be used for scenarios where a mix of tagged and untagged traffic is required.

Example: A hybrid port might send untagged traffic for VLAN 10 and tagged traffic for VLAN 20.

Mix :

This is not a standard VLAN link type and does not exist in Ethernet switch configurations.

Thus, the correct answers are A (Trunk) , B (Access) , and C (Hybrid) .

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Link Types.

IEEE 802.1Q VLAN Tagging Standards .

Bridging ONU Configuration :

A bridging ONU acts as a transparent bridge between the PC and the OLT, forwarding traffic without modifying it.

VLAN Configuration for ETH1 :

VLAN 1 : The default VLAN, often reserved for management purposes. Using it for Internet access is not recommended.

Default Configuration : Leaving the port unconfigured may result in improper VLAN tagging or untagged traffic, leading to connectivity issues.

VLAN 4094 : Typically reserved for special purposes (e.g., QinQ termination) and is not suitable for general Internet access.

Native VLAN : Configuring a native VLAN ensures that untagged traffic from the PC is associated with the correct VLAN for Internet access.

Why D?

Configuring a native VLAN is the correct approach to ensure proper VLAN tagging and seamless Internet access for the PC connected to ETH1.

Thus, the correct answer is D .

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Configuration.

GPON Bridging ONU Configuration Guide by Huawei.

GPON vs. XGS-PON :

GPON : Provides asymmetric bandwidth (2.5 Gbps downstream, 1.25 Gbps upstream) and supports up to 128 ONUs per PON port.

XGS-PON : Provides symmetric bandwidth (10 Gbps upstream and downstream) and supports up to 256 ONUs per PON port.

ODN Compatibility :

XGS-PON operates over the same ODN (Optical Distribution Network) as GPON, meaning no changes are required to the existing fiber infrastructure.

XGS-PON uses different wavelengths (1577 nm downstream, 1270 nm upstream) to coexist with GPON on the same ODN using wavelength division multiplexing (WDM).

Why TRUE?

XGS-PON supports higher bandwidth and more users while maintaining compatibility with the existing GPON ODN architecture.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: GPON vs. XGS-PON.

ITU-T G.9807.1 Standards for XGS-PON .

SNMP Overview :

SNMP (Simple Network Management Protocol) is used for managing and monitoring network devices.

TCP/IP Protocol Stack Layers :

Application Layer : Protocols that provide services directly to end users or applications (e.g., HTTP, FTP, SMTP).

Transport Layer : Protocols that ensure reliable data transfer (e.g., TCP, UDP).

Network Layer : Protocols that handle packet routing (e.g., IP).

Control Layer : Not a recognized layer in the TCP/IP model.

SNMP Placement :

SNMP operates at the Application Layer of the TCP/IP protocol stack. It uses UDP (User Datagram Protocol) as its transport protocol but resides at the application layer.

Why A?

SNMP is an application-layer protocol designed for network management tasks.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: SNMP Protocol.

RFC 1157: SNMP 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).