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Computing - Section 2 (Network protocols pt2 (TCP/IP is the protocol that…
Computing - Section 2
Network protocols pt2
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FTP - Used to access, edit and move files between devices on a network
POP3 - Used to retrieve emails from a server. Server holds email till downloaded, at this point it is deleted
IMAP - Used to retrieve emails from a server. Server holds the email until you actually delete it - you can only download a copy
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Network protocols
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Coms between different networks use IP addresses, either 32 or 128 bit - 32 goes denary 4 numbers and 128 goes 8 hexi
Coms on the same network use MAC addresses - unique to device and unchangeable - either 48 or 64 bit - 6 hexi
Each router reads the packet header and decided which way to send it - according to the IP rules -> packets can be prioritised if it gets too many -> different routes - wrong order, receiving device reads nums and puts in order -> can go missing so device checks - else sends timeout message
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Networks
A LAN is a local area network - Small geographical area located on a single site - its owned by the organisation that uses it
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Client server - P2P
Client servers are made of clients and servers - managed by a server - stuff stored centrally - expensive to set up, easy back up, easy updates, if server goes ya screwed
P2P don't use servers - everything connects directly to each other - easy to maintain, no dependence to a server, Individual instillation of tings, slow
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