Huawei HCIA-Access V2.5 H35-210_V2.5 Exam Practice Test

Answer : C

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.

Answer : C

DHCP Relay Agent Functionality :

A DHCP relay agent forwards DHCP packets between clients and servers located in different subnets.

It modifies the packet headers to ensure proper delivery:

Converts broadcast packets from clients into unicast packets to forward them to the DHCP server.

Converts unicast responses from the DHCP server back into broadcast packets for delivery to clients.

Why C?

The DHCP relay agent performs bidirectional conversion between broadcast and unicast packets to facilitate communication between clients and servers in different subnets.

Other Options :

A : Incorrect because DHCP relay agents do not convert packet types (e.g., Ethernet vs. non-Ethernet).

B : Incorrect because the relay agent handles both broadcast-to-unicast and unicast-to-broadcast conversions.

D : Incorrect because the relay agent modifies unicast packets during forwarding.

Thus, the correct answer is C .

HCIA Huawei ACCESS Official Documentation , Chapter: DHCP Relay Agent.

RFC 2131: DHCP Protocol Specification .

Answer : A

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 .

Answer : A

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 .

Answer : C

SNMP Trap Source Address :

The trap source address is the IP address used by the device to send SNMP traps to the NMS (Network Management System).

Configuration Options :

Option A : Setting the trap source address to 127.0.0.1 (localhost) is incorrect because it is not routable and cannot be used for communication with the NMS.

Option B : Using the loopback address is possible but not recommended unless the NMS is explicitly configured to accept traps from the loopback address.

Option C : Setting the trap source address to the same address used by the NMS to add the device ensures proper communication and alignment between the device and NMS.

Option D : Incorrect because not all options are valid.

Why C?

Configuring the trap source address to match the address used by the NMS ensures that the NMS can correctly identify and process traps from the device.

Thus, the correct answer is C .

HCIA Huawei ACCESS Official Documentation , Chapter: SNMP Configuration.

RFC 3411: SNMP Framework .

Answer : D

When configuring a static route, certain parameters are required for the route to function correctly. Let us analyze each option:

Option A :

Incorrect : The preference (or administrative distance) is optional. If not specified, the router uses the default preference value for static routes.

Option B :

Incorrect : While the next-hop IP address is commonly used in static route configuration, it is not always mandatory. For example, you can specify an outgoing interface instead of a next-hop address.

Option C :

Incorrect : The subnet mask is essential for defining the network prefix of the destination network. Without the mask, the router cannot determine the range of IP addresses covered by the route.

Option D :

Correct : The subnet mask is mandatory when configuring a static route. It defines the network portion of the destination IP address, enabling the router to match packets to the correct route.

Thus, the correct answer is D .

HCIA Huawei ACCESS Official Documentation , Chapter: Static Route Configuration.

IP Routing and Subnet Masks by Huawei.

Answer : D

Let us analyze each protection scheme:

Type A Protection :

Protects only the trunk fiber (between the OLT and the splitter).

Does not protect branch fibers.

Type B Single-Homing Protection :

Protects the trunk fiber but does not extend protection to branch fibers.

Type B Dual-Homing Protection :

Similar to Type B single-homing but uses two OLTs for redundancy. Still does not protect branch fibers.

Type C Protection :

Provides end-to-end protection , covering both the trunk and branch fibers.

Uses redundant fibers and splitters to ensure continuity in case of failures in either the trunk or branch fibers.

Thus, the correct answer is D , as Type C protection is the only scheme that protects branch fibers.

HCIA Huawei ACCESS Official Documentation , Chapter: GPON Protection Mechanisms.

GPON Redundancy and Protection Schemes by Huawei.