Rarp

here i discuss about rarp,for any mistake forgive me

1. Presentation Of Networking Protocol by : Anusua Basu. ( BCA 3 rd sem. ) Midnapore College (Autonomous)

2. NETWORKING PROTOCOL RARP (Reverse Address Resolution Protocol)

3. Content : Introduction to rarp Logical address & physical address Translation Dynamic mapping Rarp operation Uses of rarp Alternative of rarp

4. Definition – The Reverse Address Resolution Protocol ( RARP ) is an obsolete computer networking protocol used to find the logical address for a machine that knows only its physical address.

5. Logical Address / IP Address : A logical address is a 32 bits address sequence of 1’s and 0’s. The hosts and routers are recognized at the network level by their logical addresses. A logical address is an internet address.

6. Physical Address / Mac Address : In order to communicate or transfer the data from one computer to another computer we need some address. Media Access Control Address is a physical address which works at Data Link Layer. MAC Addresses are unique hardware number of a computer, which is embedded into network card (known as  Network Interface Card ) during the time of manufacturing. MAC Address is also known as  Physical Address  of a network device.  MAC addresses are unique 6 Byte or 48 bit hardware number. E xample: 00-0b-75-b1-c0-8e : : : : : . . . . .

7. How to find mac address : Command for UNIX/Linux - ifconfig –a i p link list i p address show Command for Windows OS - ipconfig /all MacOS - TCP/IP Control Panel

8. Translation : We need both the physical address and the logical address for packet delivery or efficient communication. Thus, we need to be able to map a logical address to its corresponding physical address and vice versa.. Solution: Dynamic Mapping

9. Dynamic Mapping : Use a protocol to find another address ARP: Address Resolution Protocol Map a logical address to a physical address RARP: Reverse Address Resolution Protocol Map a physical address to a logical address

10. ARP vs RARP

11. Uses of rarp :

12. ALTERNATIVE OF RARP : The Reverse Address Resolution Protocol had few disadvantages which eventually led to its replacement by BOOTP and DHCP. Some of the disadvantages are: The RARP server must be located within the same physical network. The computer sends the RARP request on very cheap layer of the network. Thus, it’s unattainable for a router to forward the packet because the computer sends the RARP request on very cheap layer of the network. The RARP cannot handle the subnetting process because no subnet masks are sent. If the network is split into multiple subnets, a RARP server must be available with each of them. It isn’t possible to configure the PC in a very modern network. It doesn’t fully utilize the potential of a network like Ethernet.