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If the value of the PROTOCOL field in the PPP protocol is 8021, which of the following protocols is used?
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 .
HCIA Huawei ACCESS Official Documentation , Chapter: PPP Protocol.
RFC 1661: PPP Protocol Specification .
In the Simple Network Management Protocol (SNMP) structure, the Agent is an agent process running on a managed device. After a managed device receives a request from the NMS, the Agent responds to the request. The Agent collects device status information, operates managed devices by executing commands on the NMS, and reports alarms to the NMS.
SNMP Structure Overview :
SNMP consists of three main components:
NMS (Network Management System) : The central system that manages and monitors devices.
Agent : A process running on the managed device that interacts with the NMS.
MIB (Management Information Base) : A database of manageable objects on the device.
Agent Functionality :
The Agent performs several key functions:
Responding to Requests : When the NMS sends a request (e.g., GET, SET), the Agent retrieves or modifies the requested information and responds.
Collecting Status Information : The Agent continuously monitors the device and updates the MIB with relevant data.
Executing Commands : The Agent executes commands issued by the NMS, such as restarting a service or applying configurations.
Reporting Alarms : The Agent sends traps (alarms) to the NMS when specific events occur (e.g., interface down, high CPU usage).
Why TRUE?
The statement accurately describes the role and functionality of the Agent in the SNMP structure.
Thus, the correct answer is A .
HCIA Huawei ACCESS Official Documentation , Chapter: SNMP Protocol.
RFC 3411: SNMP Framework .
When adding an ONU to the OLT, if Control flag is deactive, run the ont activate command in GPON port mode to activate the ONU.
ONU Activation Overview :
When an ONU (Optical Network Unit) is added to the OLT, it may initially be in a deactivated state (Control flag = deactive).
To bring the ONU online, it must be explicitly activated using the ont activate command.
Command Usage :
The ont activate command is issued in GPON port mode to activate the ONU. Once activated, the ONU transitions to the Online state and begins normal operation.
Why TRUE?
The statement accurately describes the procedure for activating an ONU when the control flag is deactive.
Thus, the correct answer is A .
HCIA Huawei ACCESS Official Documentation , Chapter: ONU Activation.
OLT Command Reference Guide by Huawei.
Which technology is used by vectoring to cancel inter-VDSL2 line crosstalk in downstream?
Vectoring in VDSL2 :
Vectoring is a technology used to mitigate crosstalk (interference between adjacent copper lines) in VDSL2 systems, improving data rates and stability.
Crosstalk occurs when signals from one line interfere with signals on another line, especially in bundled copper cables.
Pre-coder Technology :
Pre-coding is a key technique used in vectoring for downstream transmission.
It works by pre-distorting the transmitted signal at the DSLAM (Digital Subscriber Line Access Multiplexer) to cancel out the expected crosstalk at the receiver (CPE).
This ensures that the received signal at each CPE is free from interference caused by other lines.
Other Options :
fdps : Not a recognized term in the context of vectoring or VDSL2.
Canceller : While cancellation is part of vectoring, the specific term 'Canceller' is not used in this context.
Postponed : This is unrelated to vectoring or crosstalk mitigation.
Why C?
Pre-coding is the correct technology used in vectoring to cancel downstream crosstalk in VDSL2.
Thus, the correct answer is C .
HCIA Huawei ACCESS Official Documentation , Chapter: VDSL2 Vectoring.
ITU-T G.993.5 Standards for Vectoring in VDSL2 .
If the outband NMS is unreachable, which of the following operations can be performed? (Select All that Apply)
A/B:Basic network checks (IP configuration and physical connectivity).
C:Inband and outband NMS IPs must be in different subnets to avoid conflicts.
