Basics Of Port Addressing
OLPU KRISHNAVENIFor Example, your friend who is in canada , wants to send some things and you are in mumbai apartment. From this we learn the what is port address.
Analogy
Reaching our city = Reaching our network.(IP Address)
Reaching our apartment = Reaching the host.(MAC address)
Reaching the right person = Reaching the right process.(Port Address)
PORT ADDRESS OR PORT NUMBER :
In a node, many processes will be running
Data which are sent/received must reach the right process.
Every process in a node is uniquely identified with the help of port numbers.
Port=Communication end point
Fixed port numbers and dynamic port numbers(0-65535)
Example:
Fixed port number: 25,80 etc.,
OS assigned dynamic port numbers: 62414
HOW TO SEE PORT NUMBERS IN REAL DEVICES :
Here, open resource monitor and click on network, click on Listening ports see the port numbers and my chrome port number is 5353 on this computer.
KEY POINTS TO PONDER
Before sending the data, any node must
*Attach source IP Address, and destination IP Address.
*Attach source MAC Address and destination MAC Address.
*Attach source port number and destination port number.
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