Protocols and Layers
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What is a set of rules called?
A protocol
What is HTTP and what is it used for?
Hypertext Transfer Protocol, is used for accessing and receiving web pages via the internet.
What does HTTPS do?
Encrypts the info so it cannot be understood if intercepted.
What is FTP used for?
File Transfer Protocol is used for sending or receiving files to or from a FTP server.
Where are emails first sent to, using which protocol?
STMP Protocol, they are sent to mail servers.
What happens after a email has been sent to the mail server?
Forwarded to other SMTP servers and is stored when reaches destination server.
What does the User’s computer use to access the email?
POP (Post Office Protocol) or IMAP (Internet Message Access Protocol) to access the email.
What does POP and IMAP do?
Fetch message data and attachments from your remote mail server.
What does POP do?
POP will download every new message to your local device and with them no longer being available on the server.
What does IMAP do?
Leave messages on server, they can be accessed by multiple devices and are only removed if the user deletes them.
What is SMTP?
Email protocol used for sending emails.
What does TCP stand for?
Transmission Control Protocol.
What does TCP do?
Breaks up messages sent over the internet into small parts called packets, reassembles the packets at the other end and detects errors.
What is IP and what does it do?
Internet Protocol, routes the individual packets from one IP address to another.
How many layers are in the TCP/IP protocol stack?
4 Layers, enables communication on internet.
What are the four different layers in the stack?
Application Layer transport layer Internet Layer Link Layer
What are Layers?
Layers are self contained.
Can the functionality of Layers be changed without affecting other layers?
Yes.