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Port address, logical and physical address

Updated on June 3, 2010

Port, Physical and Logical Address

 Port Address:

Ø      Port address is a feature of a network device that translates TCP or UDP communications made between a host and port on an outside network

Ø      It allows a single IP address to be used for many internal hosts.

Ø      Port address can automatically modify the IP packets' destination or source host IP and port fields belonging to its internal hosts.

 

Physical Address:

Ø      Frames need to be transmitted to different systems on a network.

Ø      Data link layer adds a HEADER to frame.

Ø      Header defines the physical address of sender (Source address) and receiver address (Destination address).

Ø      Frame is intended for a device outside the network.

 

Logical Address:

Ø      If a packet is going from one network to another, need another addressing system to help distinguish source and destination systems

Ø Network layer adds Header to the data coming from upper layers that among other things include LOGICAL ADDRESS of the sender and receiver.

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      PaulTodd 5 years ago

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      ABC 14 months ago

      Please give example

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      ramya.khandel@gmail.com 3 months ago

      it is nice ,but want more examples

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      Bindhya bibin 8 weeks ago

      • Logical Address is IP address which is not fixed and it regularly changes and it depends upon the Network layer.

      o It defines the sender and receiver at the network layer and is used to deliver messages across multiple networks.

      o The address is independent of the underlying physical networks.

      o Since different networks have different addressing format, Physical addresses cannot be used when the networks are interconnected.

      o It is a universal addressing system to identify systems uniquely.

      • Physical address is called as MAC address which is fixed for every system

      o Lowest level address.

      o It is used by datalink layer and physical layer to deliver data from one node to another within the same network.

      o It is included in the frame by datalink layer.

      o The size and format of the physical address depends on the network.(eg: Ethernet uses 48-bit addresses)

      • Port address (Service Point Address) is used for each process from client to server and it depends on the transport layer.

      o It is not sufficient to transfer data from on e computer to another.

      o A label assigned to process known as port address.

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