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Table 4 shows three layers of the TCP/IP model and some protocols that operate at each of these layers - AQA - GCSE Computer Science - Question 20 - 2021 - Paper 1
Question 20
Table 4 shows three layers of the TCP/IP model and some protocols that operate at each of these layers. Table 4 | Layer | Protocol | |----------... show full transcript
Worked Solution & Example Answer:Table 4 shows three layers of the TCP/IP model and some protocols that operate at each of these layers - AQA - GCSE Computer Science - Question 20 - 2021 - Paper 1
Step 1
Application layer protocol
Answer
I will describe the role of the HTTPS protocol, which operates at the Application Layer. HTTPS, or Hypertext Transfer Protocol Secure, is an extension of HTTP that ensures secure communication over a computer network. It encrypts data exchanged between a user’s browser and the web server, providing a layer of security to prevent eavesdropping or tampering. This is accomplished through SSL/TLS protocols that validate the server’s certificate, ensuring that the data transferred is protected from interception.
Step 2
Transport layer protocol
Answer
For the Transport Layer, I will discuss TCP, or Transmission Control Protocol. TCP is responsible for establishing a reliable connection between devices. It segments data into packets, sends them to the destination, and ensures that they arrive intact and in order. If packets are lost or received out of order, TCP manages the resending and reordering of packets, thus guaranteeing data integrity and reliable communication.
Step 3
Internet layer protocol
Answer
Lastly, I will describe the Internet Protocol (IP) from the Internet Layer. IP is responsible for routing packets of data from the source to the destination across multiple networks. It assigns unique IP addresses to devices on a network, allowing for proper identification and routing of data packets. The primary function of IP is to ensure that data is sent to the correct endpoint, regardless of how many networks it traverses.