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Networks (Firewall (When files are sent across the internet, they are…
Networks
Authentication
This is where users of a computer system will be given different access rights depending on their role in the company.
What this means is that depending on their role in the company, some users will have access to certain parts of the system, with other parts inaccessible
For example, in a school, students will only have access to their documents within their own account, whereas a network admin will have access to all accounts and all student's documents.
Access levels are important to ensure that employees cannot view sensitive information (payroll, etc.) and cannot sabotage vital system data.
Encryption
Encryption is where data is scrambled before being sent across a network so that it is unreadable if intercepted.
To encrypt data, an encryption key is used which will convert 'plain text' to 'cipher text'.
An encryption key is an algorithm which will systematically alter each piece of data in a file. For example, a key may convert each letter in a text file to the next letter in the alphabet.
e.g. hello becomes ifmmp
For the cipher text, to be converted back to 'plain text', the same key is required by the recipient to reverse the encryption.
Firewall
When files are sent across the internet, they are broken down into small packets of data.
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Having ports closed protects the computer from hackers, plus its continual monitoring will help detect hacker activity
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MAC address filtering
A device that has the proper credentials (SSID and password) can authenticate with the network router and join the network, getting an IP address and access to the internet and any shared resources.
MAC address filtering adds an extra layer to this process. Before letting any device join the network, the router checks the device's MAC address against a list of approved addresses.
If the client's address matches one on the router's list, access is granted as usual; otherwise it's blocked from joining.
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