- 2072 Chaitra · 3 marks
Tasks done at OSI layers (set 1)
Short answer
Error detection and correction are done at the data link layer, encryption and decryption at the presentation layer, logical identification at the network layer, point-to-point socket connection at the transport layer, dialogue control at the session layer, and physical identification at the data link layer.
Explain in which level of the OSI layer the following tasks are done: i) Error detection and correction ii) Encryption and decryption of data iii) Logical identification of computer iv) Point-to-point connection of socket v) Dialogue control vi) Physical identification of computer.
| Task | OSI layer |
|---|---|
| i) Error detection and correction | Data link layer (CRC, checksum; also done end-to-end at the transport layer) |
| ii) Encryption and decryption of data | Presentation layer |
| iii) Logical identification of computer | Network layer (IP address) |
| iv) Point-to-point (process-to-process) connection of socket | Transport layer (port number and socket address) |
| v) Dialogue control | Session layer |
| vi) Physical identification of computer | Data link layer (MAC address) |
The data link layer handles both error control for each hop and the MAC (physical) address. The network layer uses a logical address such as an IPv4 address so that a host can be located on any network.
✓ Answer checked by Claude Opus 5.5 (high effort)
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