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Define the term computer network - AQA - GCSE Computer Science - Question 13 - 2021 - Paper 1
Question 13
Define the term computer network. A computer network is a collection of interconnected devices that communicate with each other to share resources, information, and... show full transcript
Worked Solution & Example Answer:Define the term computer network - AQA - GCSE Computer Science - Question 13 - 2021 - Paper 1
Step 1
Define the term computer network.
Answer
A computer network is a collection of interconnected devices that communicate with each other to share resources, information, and services. This network typically consists of two or more computers that are connected through various transmission mediums such as cables or wireless signals.
Step 2
Explain how a firewall can be used to improve the security of a computer network.
Answer
A firewall acts as a barrier or interface between a computer network and external connections or devices. It inspects incoming and outgoing packets of data to determine whether they are malicious. By setting firewall settings and criteria, it can allow or block packets based on predetermined rules, thereby restricting access to certain services or ports.
Step 3
Explain how a firewall can be used to improve the security of a computer network.
Answer
A firewall serves as a protective layer for the network. It checks data packets to see if they comply with established rules; if they are deemed unsafe or unauthorized, the firewall blocks them. This helps to prevent attacks from external sources and secures the network by managing the flow of traffic.
Step 4
Explain how one of these security methods works.
Answer
I will explain MAC address filtering. MAC address filtering involves taking the unique MAC address of a device and checking it against a list of allowed addresses. This ensures that only devices on the list can connect to the network, as the network will deny access to any device not recognized on the list.
Step 5
How it works.
Answer
The network compares the MAC address of connecting devices to specific entries in its allowed list. If a device's MAC address matches one on the list, the device is permitted access. Conversely, if the MAC address is not on the list, the network denies access, thereby enhancing security.
Step 6