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

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.

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 .

References:

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

File Transfer Protocols Comparison by Huawei.

PPP Protocol Overview :

PPP (Point-to-Point Protocol) uses the PROTOCOL field in its header to identify the type of encapsulated protocol.

Protocol Field Values :

0x8021 : Indicates IPCP (Internet Protocol Control Protocol) , which is used to negotiate IP-related parameters during PPP session establishment.

0xC021 : Indicates LCP (Link Control Protocol) , which is used for establishing, configuring, and testing the PPP link.

0x002B : Indicates IPX (Internetwork Packet Exchange) .

0x0021 : Indicates IP (Internet Protocol) .

Why A?

The value 0x8021 corresponds to IPCP , making it the correct answer.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: PPP Protocol.

RFC 1661: PPP Protocol Specification .

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 .

2.4 GHz Frequency Band :

The 2.4 GHz band is divided into 14 overlapping channels, each 20 MHz wide.

However, only three channels (e.g., Channels 1, 6, and 11 in North America) are non-overlapping and can be used simultaneously without interference.

Why TRUE?

By using non-overlapping channels (e.g., 1, 6, and 11), wireless networks can operate concurrently without significant interference.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: WLAN Frequency Bands.

IEEE 802.11 Standards for WLAN .

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 .

References:

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

GPON System Architecture by Huawei.

DBA (Dynamic Bandwidth Allocation) :

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

Functions of DBA :

Improves upstream bandwidth utilization : DBA ensures efficient use of the limited upstream bandwidth by allocating it dynamically to ONUs as needed.

Does not increase total upstream bandwidth : The total upstream bandwidth of a PON port is fixed and determined by the hardware. DBA optimizes how this bandwidth is used.

Does not affect downstream bandwidth : Downstream bandwidth is shared via broadcasting and is not managed by DBA.

Does not add more ONUs : The number of ONUs supported by a PON port depends on hardware capacity, not DBA.

Why C?

DBA improves the efficiency of upstream bandwidth utilization by dynamically allocating resources.

Thus, the correct answer is C .

References:

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

GPON Dynamic Bandwidth Allocation by Huawei.