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

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 .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: SNMP Protocol.

RFC 1157: SNMP Protocol Specification .

The Address Resolution Protocol (ARP) is used to map IP addresses to MAC addresses in a local network. ARP operates at the data link layer (Layer 2) of the OSI model and is essential for communication within a LAN.

ARP Request :

When a device needs to communicate with another device on the same network but does not know the destination's MAC address, it sends an ARP Request .

Since the sender does not know the MAC address of the destination, it cannot send the request directly to the destination using unicast. Instead, the ARP Request is sent as a broadcast packet to all devices on the local network.

The broadcast packet has a destination MAC address of FF:FF:FF:FF:FF:FF, which ensures that all devices on the network receive the packet.

ARP Response :

The device with the matching IP address responds with an ARP Reply , which is sent as a unicast packet back to the requesting device.

Why Not Other Options?

Anycast : This involves sending packets to the nearest device in a group of devices sharing the same IP address. ARP does not use anycast.

Unicast : ARP Requests cannot be sent as unicast because the sender does not yet know the destination's MAC address.

Multicast : Multicast is used for sending packets to a specific group of devices, but ARP Requests are sent to all devices on the network, making broadcast the correct choice.

Thus, ARP Requests are transmitted as broadcast packets .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: ARP Protocol and Operation.

Ethernet Networking Fundamentals by Huawei.

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.

References:

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

GPON Redundancy and Protection Schemes by Huawei.

Dynamic Bandwidth Assignment (DBA) :

DBA dynamically allocates upstream bandwidth among ONUs based on their traffic demands. Different DBA types are used for different service requirements.

DBA Types :

Type 1 : Fixed bandwidth allocation, suitable for constant bit-rate services like voice.

Type 3 : Mixed allocation, combining fixed and assured bandwidth. It is commonly used for AR (Assured Rate) services, which require guaranteed minimum bandwidth with flexibility for additional bandwidth.

Type 4 : Best-effort allocation, suitable for non-critical services like web browsing.

Why B?

Type 3 is specifically designed for AR services, providing both guaranteed and flexible bandwidth allocation.

Thus, the correct answer is B .

References:

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

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

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 .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: ONU Management.

OLT Command Reference Guide by Huawei.

Comprehensive and Detailed Step by Step Explanation:All options are valid VLAN types in Huawei access networks:

MUX VLAN: Isolates users within the same VLAN.

Smart VLAN: Dynamically assigns VLANs based on MAC/IP addresses.

Super VLAN: Aggregates multiple sub-VLANs into one logical VLAN.

Vectoring Classification :

Vectoring is primarily classified into two types based on the scope of crosstalk cancellation:

System-Level Vectoring (SLV) : Applies to all lines within a single DSLAM or cabinet.

Node-Level Vectoring (NLV) : Applies to lines across multiple DSLAMs or nodes.

However, these are not the only classifications. Other implementations, such as hybrid approaches, may also exist depending on the network design.

Why FALSE?

The statement incorrectly claims that vectoring is classified only as SLV and NLV, ignoring other possible implementations or variations.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: VDSL2 Vectoring Architectures.

ITU-T G.993.5 Standards for Vectoring in VDSL2 .