Network Protocols Flashcards
What is a protocol?
A set of rules that governs how a computer communicate on a network
What is Ethernet
What prefix
What cables typically
A family of protocols
Set of rules that govern how data is formatted for transmission across wired networks
Standardised again by IEEE
prefix is 802.3
Wired copper / fibre optic typically , fibre optic typically linking your router to your isp providing higher speeds
Deals with performance, format of data packets and how to deal with collisions
What is wi-fi
What standardised by what prefix
What speeds can never one reach?
Control how data is transmitted on a wireless local area network (WLAN)
FAMILY of protocols giveneing wireless communications standardised by IEEE.
Prefix is 802.11
6gbps 11.ac one
What is TCP/IP?
Transfer Control Protocol
Internet Protocol
GIVEENW RHE WAY DEVICES ARE CONNECTE DINNA NETWORK
2 protocols that often work together
Their role is to break up data into packets, each of which is a chunk of data that know where it has been sent from and where it is to be delivered to
What is UDP
What alternative to
What is it used for
What is handshaking?
User Datagram Protocol
Transmits data packets very quickly, but without checking to see whether each packet has arrived, so it is not always reliable, it does this by not using HANDSHAKING
Alternative to tcp
Real time communications such as computer games or video conference where fast speeds are mor eimportsnt than a few packets being incorrect
Where everything is checked to have sent perfectly before it reassembles , links are pre established before communications start
What is HTTP
Governs how web browsers can access web sites from a web server , requesting individual files from a web server and then when received rendered into a web page
(Receive web pages)
What is HTTPS
HTTP Secure
Encrypts data that is sent across the Internet
Encrypted data cannot be read so is favoured when entering sensitive info
What is FTP
Where is it he’s elite relied upon?
File Transfer Protocol
Used to transfer (upload and download) files between a clien and a server on a network in conjunction with TCP/IP model
Web building, moving files from developer to a web server where they can then be accessed publicly
What is the SMTP
Simple Mail Transfer Protocol
Givens then way emails are sent across a network, almost all emails sent this way
What is IMAP
How does it work, and how different to pop
What else can it do (4 things
Internet Message Access Protocol
1) givens the way emails are RETRIEVED.
- email sever receives the email and they are held on the server, the claint has it downloaded, but even after downloaded THE EMAIL REMAINS ON THE SERVER …(different to pop3)
- also used to allow emails to be viewed from multiple devices (as stored on server)
- complex searches to be carried out on emails
- handles more than one mailbox
- can indicate if the email was read or replied to.
What does TCP part of TCP/IP model do?
6 steps
1) divides message into packets
2) adds a sequence number for tracking
3) provides error correction information to the packet (in case error happens )
4) examines packet for errors and fixes if possible
5) requests for missing or corrupt packets to be reine
() finally it reassembles packets back together
What does IP protocol in TCP/IP model do
Responsible for
1) providing destination address
2) source address from where it came from and accepts packets with right address and rejects those without
What isnPOP 3
Post office protocol, 3
1) givens the way in which e,also are received
1) emails are received by an email server.
2) client periodically logs on and downloads any emails
3) the email is then WIPED FROM THE SERVER
Therefore it can not be accessed from different devices and is thus becoming increasingly unpopular compared to IMAP
What are the warnings that a good protocol should have ?
4
How to sup and end a connection
2) how to start and end a message
3) how deal with corrupted data
4) how to format the data being sent
(Connection, Message, corrupted, format data )
