Protocols Flashcards
what is a protocol
a set of rules that determine exactly how a computer communicates across a network
what would the effect of not having any protocols
- no two computers would speak the same language
- so no data could be transmitted
why do different protocols exist
to govern different activities
what is TCP/IP and what does it stand for
- it is Transmission control protocol and internet protocol
- it is a suit of protocols
what does TCP/IP do
- when data is about to be transmitted
- it breaks that data down into bits called packets
what is the IP in TCP/IP responsible for
ensuring that each packet reaches the correct destination
what does the computer receiving packets of data do to it and with what
the computer receiving that packets uses TCP/IP to reassemble the packets back into the original data
what does UDP stand for and what does it do
- it is the user data program
- uses IP to transmit data and is designed to transmit as quickly as possible
what is a disadvantage of UDP
it doesnt guarantee data delivery
what is HTTP and what does it stand for
- it is the hypertext transfer protocol
- it is used to transmit web pages from a server to a client
when do you use HTTP
whenever you type in a URL or click on a link
what does the S stand for in HTTPS and what does it do
- secure
- meaning transmitted data is encrypted
- so financial transactions are safer than using regular HTTP
what does FTP stand for and what is it
- it is the file transfer protocol
- it is a set of rules governing the transmission of files across the internet
what would FTP do if you were uploading images to a website
the upload of these files uses FTP to copy them from your computer to the web server
what are POP IMAP and SMTP
protocols relating to the sending of an email
what does POP stand for and what does it do
- it is the post office protocol
- it allows you to download your emails from a server to your computer
what does IMAP stand for and what does it do
- is the internet message access protocol
- it is used to synchronise devices that access e mails`
what does SMTP stand for and what does it do
- it is the simple mail transfer protocol
- when an email is sent, it moves from server to sever
- its route of transmission from server to server is controlled by SMTP
what is WiFi
WiFi is a set of rules governing how devices can communicate with one another wirelessly
what must devices using WiFi do
- format their transmissions in a certain way
- they also need to transmit data on pre agreed frequencies to be recognised by their network
what is ethernet
Ethernet is set of rules which describes how a set of wired devices communicate
what is a layer
a layer is a division of network functionality
what are two advantages that come with using layers to construct network protocols
- if it is self contained, it allows different developers to concentrate on one aspect of the network
- a layer can be taken out and edited without affecting other layers
