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1.4 Describe the network protocol and the principals of communication (The…
1.4 Describe the network protocol and the principals of communication
The rules
WHAT IS COMMUNICATION?
Message source
Transmitter
Transmission Medium
Receiver
Message Destination
The rules
ESTABLISHING THE RULES
identified sender and receiver
agreed upon method of communicating (face-to-face,telephone.letter,photographer)
common language and grammar
speed and timing and delivery
confirmation and acknowledgement requiredments
The rules
MESSAGE ENCODING
Message source
Encoder
Transmitter
Transmition Medium "The Channel"
Receiver
Decoder
Message Destination
Rules Of Communication
Message Encoding
Encoding
The procces of converting thoughts into the language, symbol, or sounds, for transmission.
Decoding
reverse this procces in order to interpret the information
Message sent across the network are first convert into bits by the sending hosts.
Message Formatting
depend on the type of message amd the channel that is use to deliver the message
each computer message is encapsulate in specific format called a frame before it is send over the network
FRAME: Provide the address of the intended destination and the address of the source hosts
Messages that are not correctly formatted are not successfully delivered to or processed by the desrtinaton hosts
Message Timing
Access Method
Determine when is able to send a message
Based on the environment
hosts on a network need an access method to know when to begin sending message and how to respond when error occur.
Flow control
how much information can be send and the speed that it can be delivered.
a sending hosts can transmit message at a faster rate than the destination hosts can receive and process
source and destination hosts use flow control to negotiate correct timing for successful communication.
Respond Time Out
hosts in the network also have rules that specify how long to wait for responds and what action to take if a respond time out occurs.
Message Delivery Options
unicast
a one-to-one message pattern
there is only a single destination for the message
Multicast
a host needs to send message using a one-to-many pattern
delivery of the same message to a group of host destination simultaneously
Broadcast
all host on the network need to receive the message at the same time
Represent a one to all message pattern
hosts have requirements for acknowledge versus unacknowledge message.
Network Protocols
IP(internet protocol)
HTTP(hypertext transfer protocol)
DHCP(dynamic host configuration protocol)