Protocols are rules that a network system follows. There are many different types of protocol:
- TCP: Organises data so that a transmission between the server and the client can be secure
- Data can be retransmitted if it gets lost
- Difficult so set up and manage
- IP: Allows computers to communicate with websites and tells the website who's connecting
- Gives additional security to the network
- IP addresses are easily tracked
- UDP: Establishes connections to the internet
- Smaller packet size means faster processing
- If error is detected, the packet is dropped
- FTP: Transfers files between systems
- Fast file transfer
- Usernames, passwords and files are sent in plain text
- HTTP: Transfers information between the client and the web server
- Very flexible and can handle extensions and plugins
- No encryption so data can be altered
- SNMP: Network protocol that allows devices to communicate with other devices
- Open protocol so is not property of a single company
- Can't receive a large amount of data so isn't scalable
- ICMP: Network protocol that allows devices to communicate with other devices and sends errors
- Generates error messages so can be easily diagnosed
- Vulnerable to PING flood
- POP: Retrieves email from a remote server
- Mail is downloaded so can be viewed when offline
- Mail cannot be accessed from another device
- IMAP: Retrieves email and stores them on a server
- Can be accessed from another mail client
- Can be complex to maintain
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