Flashcards
Unit 2 Revision Cards
Cards in this deck (14)
- 1What is the application layer?The application layer selects the correct protocol to use depending on which application you are using and what you are trying to do.
- 2What is the transport layer?The transport layer creates the connection between two computers or 'hosts',the computers agree the size of the packets they will send and receive.
- 3What is the data link layer?The data link layer is the physical hardware that connects two hosts.
- 4What is the network layer?The network layer is where the routers operate and destination addresses are written onto the packets ready for transmission.
- 5What is TCP/IP?TCP/IP is the protocol that breaks up messages sent over the internet into small chunks called packets,reassembles the packets at the other end,detects errors,resends lost messages and routes the individual packets.
- 6What is in the TCP/IP stack?There are four layers in the TCP/IP stack the application layer,the transport layer the network layer and the data link layer.
- 7How does email work?Mail servers pass on or store emails until they are collected and the user logs on to the server to collect mail.
- 8What is POP and IMAP?POP and IMAP are mail retrieval protocols that fetch message data and attachments from your remote mail server?
- 9What is SMTP?SMTP or simple mail transfer protocol is an email protocol used for transferring email between remote email servers.
- 10What is a protocol?A protocol is a set of rules on how computers communicate with one another.
- 11What is HTTP?HTTP(hypertext transfer protocol) is the protocol used for accessing and receiving web pages in the form of HTML files on the internet.
- 12What is HTTPS?HTTPS is a secure protocol that encrypts the information so that it cannot be understood if it is hacked.
- 13What are audit trails?Audit trails are logs that record every time a user accesses the system,the time and date along wit their actions.
- 14Why does a company want to back up data?88