CO1 Protocols Flashcards
What is a protocol?
Is a set of rules to govern communication and data transmission
What are the protocol components ?
How to set up a connection
How to end a connection
How to start a message
How to end a message
How to deal with corrupted data
How to format the data being sent
What need to happen before communication can take place?
Error correction
-odd /even parity , check sum ,echoing
Connection media
-Cable /wirless
Mode of transmission
- Simplex/duplex/serial/parallel
Code used for characters
-ASCII, UNICODE
Bit rate
- used for communication
What are the standard network protocols?
TCP/IP is the network protocol used on the the internet
What is the TCP/IP
Transmission Control Protocol
What are layers ?
Group of protocols organised by a function
Many models
Eg TCP = 4 layers
What are the benefits of Layers?
- We can focus on one layer at a time
- when u develop software and hardware as you can focus on one small part instead of everything else
- we can test it separately
- we can recognise it by what layer does what
What are the main Protocols ?
HTTP- web pages, FTP- FILE TRANSFER PROTOCOL ,SMTP- sending to a server ,POP- moves a message so can’t be seen everywhere , IMAP- copies message so can be seen everywhere
What are the 4 layers ?
Layer 4 - Application
Layer3 - Transport
Layer 2 - Internet/ IP layer
Layer 1 - Network or Datalink
What is the Application layer ?
- Deals with the data
- Provides access to email and files and websites across ip network
What is the transport Layer?
- Splits data into packets and number sequentially
- Adds port number to be used
- error checking
- Connectionless mode transmitter just send packets with out setting up session
What is the Ip layer
- Sorts out how data gets from one place to another
- sorts out ip
What is the link layer ?
- Operates across a physical connection
- sends it through the wire
What’s the difference between physical and logical protocols?
Physical protocols is set of rules for hardware
Logical is set of rules for software
