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HCSA-Field-Transmission & PTN V1.0 Questions 151–155 (page: 32)

Updated On: 9-Feb-2026

What is the main function of the physical layer?

  1. Provide a reliable information transfer mechanism
  2. A retransmission mechanism responsible for error detection and information
  3. Responsible for the physical and electrical interface between user equipment and network end equipment
  4. Establish and clear a network-wide connection between two transport protocol entities

Answer(s): C



Which of the following 7900 single-board software function descriptions are correct?

  1. The software management module in the board is used to manage signaling protocols such as OSPF/1588V2
  2. The performance and alarm module is mainly used to check the alarm and performance of the single board, and report it to the main control board
  3. QoS, PwE3, L3VPN and other services are implemented by the service management module
  4. The basic framework of the single board provides basic system support, including memory management, process/thread management

Answer(s): B,C,D



Which of the following types of protection is electrical layer protection?

  1. Optical Line Protection QLP
  2. Tributary SNCP Protection
  3. Client side 1+1 protection
  4. +1 protection inside the board

Answer(s): B



In the following label operation modes, which options does the PTN device support?

  1. PUSH
  2. SWAP
  3. POP
  4. PHP

Answer(s): A,B,C



Which of the following identification fields in the data packet header of each protocol layer cannot identify the upper layer data type carried by this layer

  1. TTL
  2. TYPE
  3. Protocol
  4. Source Port

Answer(s): A



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