Chapter 14: Communication and Internet Technologies Flashcards
(8 cards)
Purpose of Protocols
- Provide a standard set of rules to enable successful data transfer
- Enables compatibility between devices from different manufacturers or platforms
—> makes communications independent of software and hardware - If two devices with different protocols were sending messages between each other, they would not be able to communicate properly
Purpose of SSL and TSL protocols
- Provide communications security over the internet/ network
- Enables two parties to identify and authenticate each other - allows them to communicate with confidentiality and integrity
What is a Protocol Suite
The protocols in a stack determine the interconnectivity rules for a layered network model such as the TCP/IP mode
The 4 layers of the TCP/IP Protocol Suite
(LITA from outermost to innermost)
Link
Internet
Transport
Application
Purpose of Application Layer in TCP/IP and some protocols used
Application layer provides the devices to access network and applications such as emails, cloud storage etc.
————
- HTTPS -> sending/ receiving/ transfer of web pages
- FTP -> sending/ receiving files
- SMTP -> emails
- POP or IMAP
- BitTorrent -> Peer to Peer file share
Purpose of Transport Layer in TCP/IP
To put it simply - handles/ controls the flow of packets
- Responsible for the delivery of data from source host to destination host
- Breaks the data into manageable packets and sends them to the internet layer
- Handles packet loss/ corruption
Purpose of the Link Layer in TCP/IP
Handles how data is physically sends
- Ensures the correct network protocols are followed
- Enables the upper layers to access the physical medium
- Responsible for transporting data within the network
- Maps IP address to MAC address
Purpose of Internet Layer in TCP/IP
- Identifies the intended network and host
- Transmits packets to the Data Link
- Routes packets independently - through optimum route
- Uses an IP address and port number to form a socket
