Types of Address
There are
four types of addresses used in TCP/IP Protocol Suite.
Figure: Types of Addresses in TCP/IP Model |
The
physical address is the lowest level address and is also referred as link
address. The physical address of a node is defined by its LAN. The physical
address is included in the frame by the data link layer. Physical Address is 48 bits address. First 24 bits is decided by OUI and Lase 24 bits is decided by Vendor/Manufacturer of device.
Figure: Example of Physical Address |
At data link layer, the frame contains physical addresses in the header. The data link layer at sender receives data from upper layer, encapsulates the data in a frame, adds a header.
Figure: Working of Physical Address |
Only the station having matched address with destination address accepts the frames. The frame is checked, the header is removed and remove data encapsulation and deliver to upper layer.
Logical addresses are independent of underlying physical networks.
Figure: Example of Logical Address |
It is a 32-bit address which uniquely defines host connected to Internet. The physical addresses change from hop to hop, but the logical address usually remains the same.
Figure: Working of Logical Address |
Since
different networks can have different address formats hence a universal address
system is required which can identify each host uniquely of underlying physical
networks. Logical addresses are necessary for universal communications.
The IP addresses are necessary for data to travel from source to destination. But a communication process involves TELNET and FTP which requires addresses.
Figure: Types of Port Address |
Port is communication end point. Use of port address (port number) is to process to process communication in network. Port address is 16 bit address.
Figure: Working of Port Address |
In TCP/IP
architecture, the label assigned to a process is called port address. In TCP/IP
the port address is of 16-bit.
Specific addresses are designed by users for some applications.
For example, www.facebook.com.
It is the example of Universal Resource Locator (URL). It is used is used to find a document on the world wide web.
Figure: Exampel of URL |
Another example, xyz@gmail.com. It is the example of e-mail address. Email is used send text and multimedia files over internet to particular user.
Figure: Example of Email Address |
The
specific addresses get changed to corresponding port and logical addresses by
the station or host who sends it.
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