Layers and Protocols Flashcards
(23 cards)
HTTP = ________ protocol
HTTP = hypertext transfer protocol
What does the HTTP do?
Accesses and receives web pages in the form of HTML files on the Internet.
How does the HTTP work?
It requests the web server to upload the requested web page to the users browser.
HTTPS = _____ protocol
HTTPS = secure protocol
What does the HTTPS do?
It encrypts information so it cannot be understood if hacked.
FTP = _______ protocol
FTP = file transfer protocol
What does the FTP do?
It is used to send or retrieve files to or from a remote server or computer.
What is a network protocol?
A set of rules that allows the sharing of data between different devices in the same network.
SMTP = __________
SMTP = simple mail transfer
What does the SMTP do?
It is used to transfer email between remote email servers.
How does the SMTP work?
The software sends the message to the mail server and contacts the destination mail server to pass an email using SMTP.
POP = _______ protocol
POP = post office protocol
IMAP = _______________ protocol
IMAP = internet message access protocol
What does POP and IMAP do?
These email retrieval protocols fetch data and attachments from your remote mail server.
What is the difference between POP and IMAP?
POP downloads the entire message to the device and deletes them from the server, whilst IMAP only downloads the message header until the message is opened, and will leave the message on the server.
TCP/IP protocol stack = _________ protocol
TCP/IP protocol stack = transmission control protocol
What does TCP/IP protocol stack do?
Defines four layers in which different protocols operate to pass data packets across a network.
What are the four layers in the TCP/IP protocol stack?
Application layer, Transport layer, Network layer, Link layer
What does the Application Layer do?
Network applications operate on this layer, and the layer selects the correct protocol to use depending on which application it is and what you are trying to do.
What does the Transport Layer do?
Creates the connection between two computers, and agrees the communication settings and the size of the packets they will send and receive. It also divides the data into packets and resends any lost packets.
What do recipient Transport layers do?
They reassemble the packets sent to them.
What does the Network Layer do?
Routers operate on this Layer, and it writes destination addresses onto the pockets to make them ready for transmission.
What does the Data Link Layer do?
It is the physical hardware that connects the two hosts, such as the NIC or cabling.
