In a TCP/IP model which of the following layer is responsible for carrying out actual transmission of bits over Ethernet, WiFi, Optic fiber etc.

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Beltron Programmer 1 Oct 2023 Official Paper

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Answer 1

The correct answer is Option 4) Network Interface Layer.

Key Points

The Network Interface Layer (also known as the Link Layer) is the bottommost layer in the TCP/IP model.
It is responsible for the physical transmission of data bits over the network using mediums such as Ethernet, WiFi, or Optical Fiber.
This layer includes both the physical hardware (e.g., cables, network cards) and the data link protocols (e.g., Ethernet, ARP) used to transmit data.
It handles framing, MAC addressing, and error detection at the link level.

Additional Information

Option 1 – Transport Layer: Responsible for end-to-end communication and data flow control (e.g., TCP, UDP), not bit-level transmission.
Option 2 – Application Layer: Deals with user-level protocols like HTTP, FTP, and SMTP.
Option 3 – Internet Layer: Handles logical addressing, routing, and packet delivery across networks (e.g., IP, ICMP).
Summary of TCP/IP Layers:
- Application Layer – User interaction and services
- Transport Layer – Reliable or unreliable data delivery
- Internet Layer – Routing and addressing
- Network Interface Layer – Physical data transmission