Flashcards in network protocols Deck (23):
what is meant by the term protocol?
the rules that computers must follow when they are communicating, sending and receiving data over a network.
why are protocols used?
to ensure that data is sent and received accurately, to the correct address on a network.
what do protocols needs to include?
data formats - to ensure that data can be exchanged consistently and correctly.
address formats - to ensure that data goes to the right location, by identifying sender and recipients.
routing - to provide the right information so that data can flow through networks correctly.
what does TCP/IP stand for?
Transmission Control Protocol/Internet Protocol.
what is TCP/IP?
it is a stack of protocols that allow a computer to communicate across a WAN.
How does TCP/IP transmit data over a network?
split the data into smaller packets, reassemble packets on arrival and encrypt/decrypt as required.
Add the address of the recipient computer, in order to transmit the data to the correct destination.
Notify the sending computer when the data is received.
what does FTP stand for?
File Transfer Protocol
what does the protocol 'FTP' do?
provides the rules for file transfer between computers.
often used to transfer files that are too large for attachment to emails.
what does 'HTTP' stand for?
HyperText Transfer Protocol
what does the protocol 'HTTP' do?
provides rules to be followed for when a browser (client) sends requests to a web server, and web content is supplied back to the browser (client).
what does 'HTTPS' stand for?
what does the protocol 'HTTPS' do?
ensures that communication between a host and client are secure by encrypting communications.
what is meant by the term host?
a device in a network that can either be a server, a client or both.
what does 'SMTP' stand for?
Simple Mail Transfer Protocol
what does the protocol 'SMTP' do?
provides the rules for sending email from client to server and then from server to server until it reaches its destination.
what is meant by the term client?
a device that can send requests to a server for a particular service.
what is meant by the term server?
a device that can supply content to a client.
what does 'POP' stand for?
Post Office Protocol
what does the protocol 'POP' do?
used by a client to retrieve emails from a server. All of the emails are downloaded when there is a connection between client and server.
what does 'IMAP' stand for?
Internet Message Access Protocol
what does the protocol 'IMAP' do?
used by a client to retrieve emails from a server. Messages can be read and stored on the server. They do not have to be downloaded.
give one advantage of 'IMAP' over 'POP'
emails can be read from different devices.