Solution

The correct answer is B - A - D - E - C

Key Points

•  A. Transforming the raw bits in the form of frame for transmission:
  • This activity belongs to the Data Link Layer (Layer 2). This layer performs the function of formatting the data into a frame - a package that contains the necessary syntax or structure for transmission.
  • Each frame includes the data to be transmitted as well as control information such as error checking and the physical address of the destination.
• B. Transmission of raw bits over communication channel:
  • The Physical Layer (Layer 1) is responsible for this. The main function is to transmit raw bitstreams over the physical medium (the communication channel). This includes setting voltages for '0' and '1' bits, defining how devices can transmit, defining the physical network layout, and dealing with the actual connector interfaces in hardware.
• C. Handling user interfaces:
  • This is the Application Layer (Layer 7). This layer provides a user interface and facilitates interaction between the user (or the user's software) and the network. For example, this might be a web browser interacting with a web server.
• D. Control and monitoring of subnet:
  • That's a responsibility of the Network Layer (Layer 3). This layer handles operations such as routing packets through a network, addressing devices on the network, and managing network traffic congestion. Functions also include subnet traffic control, packet sequencing, and logical network layout and design.
• E. Transmission data through connection-oriented or connection-less using datagrams:
  • The Transport Layer (Layer 4) deals with this. This layer is responsible for delivering messages between devices over the network and manages error checking and retransmission of packets as necessary. It handles issues like flow control (ensuring that data is sent at a rate that the receiver can handle) and multiplexing (combining multiple signals for transmission).