What are logical and physical address?

Answer 1

Through logical address the system identify a network (source to destination). after identifying the network physical address is used to identify the host on that network. The port address is used to identify the particular application running on the destination machine.

Logical Address: An IP address of the system is called logical address. This address is the combnation of Net ID and Host ID. This address is used by network layer to identify a particular network (source to destination) among the networks. This address can be changed by changing the host position on the network. So it is called logical address.

Physical address: Each system having a NIC(Network Interface Card) through which two systems physically connected with each other with cables. The address of the NIC is called Physical address or mac address. This is specified by the manficture company of the card. This address is used by data link layer.


Port Address: There are many application running on the computer. Each application run with a port no.(logically) on the computer. This port no. for application is decided by the Karnal of the OS. This port no. is called port address.

Answer 2

logical address and physical address

A Physical address is a 48-bit flat address burned into the ROM of the NIC card which is a Layer1 device of the OSI model. This iis divided into 24-bit vendor code and 24-bit serial address. This is unique for each system and cannot be changed. In computing, a physical address, also real address, or binary address, is the memory address that is represented in the form of a binary number on the address bus circuitry in order to enable the data bus to access a particular storage cell of main memory.

In a computer with virtual memory, the term physical address is used mostly to differentiate from a virtual address. In particular, in computers utilizing memory management unit (MMU) to translate memory addresses, the virtual and physical addresses refer to an address before and after MMU translation respectively.

In computer networking, physical address is sometimes a synonym of MAC address. The address is actually used on the network's data link layer, not on the physical layer, as the name would suggest.

A Logical address is a 32- bit address assigned to each system in a network. This works in Layer-3 of OSI Model. This would be generally the IP address.

In computing, a logical address is the address at which an item (memory cell, storage element, network host) appears to reside from the perspective of an executing application program.

A logical address may be different from the physical address due to the operation of an address translator or mapping function. Such mapping functions may be, in the case of a computer memory architecture, a memory management unit (MMU) between the CPU and the memory bus, or an address translation layer, e.g., the Data Link Layer, between the hardware and the internetworking protocols (internet Protocol) in a computer networking system.

Answer 3

• Physical address is the actual address of a device set in its hardware, so it can be recognized as unique.
• Logical address is the address assigned by the operating system to a device. The operating system maintains a logical to physical address map table.

Answer 4

In logical address in we hav different clesses ie., class A, class B, class C, now a days we are using class C address. Example : (192.168.1.1) this is class C IP address. logical addresses are called as IP Address ( Internet Protocol ). Physical address are the MAC Address ie., the unique address specified by the manufacturer of ur LAN card.

Answer 5

* Address used in programs

* This term can be applied no matter whether the program is running in real or protected mode.

*simply means the numbers that specify where a program is pointing in the PC's main memory.

Answer 6

The physical address space is the 1mb address space addressed by address pins a0-a19. The logical address space is the 64kb address space address by the effective address space a0-15.

Answer 7

nic address is a physical address . network host ip is a logical address.

Answer 8

Logical address is also known as IP address . Physical address is also known as MAC address. Logiacal IP address is static while Physical address is dynamic and changes outside a network.

Answer 9

nothing at all!