Telematics Chapter 6: Network Layer - Freie Universität Berlin

Address Resolution Protocol (ARP)
Look for the physical address to the IP address 192.168.13.20
Look for the physical address to the IP address 192.168.13.20
ARP ARP Request
Response The physical address to the IP address 192.168.13.20 is 62
ARP Response
17 54 143 97 62
20? 20?
20?
A B C D E
A B 20? C D 62 E
17 54 143 97 62
192.168.13.18 192.168.13.142 192.168.13.1 192.168.13.51 192.168.13.20
192.168.13.18 192.168.13.142 192.168.13.1 192.168.13.51 192.168.13.20
The physical address to the IP address 192.168.13.20 is 62
A B C D E
� The host with the inquired IP address sends a response
192.168.13.18 192.168.13.142 192.168.13.1 192.168.13.51 192.168.13.20
� Each host stores well-known IP and hardware addresses in a table
● The � The host entries with the become inquired invalid IP address after a certain sends a time response to avoid mistakes
e.g. with the exchange of a network interface card
● Each host stores familiar IP and MAC addresses in a table
● The entries become invalid after a certain time to avoid mistakes
e.g. with the exchange of a network interface card
20
17 54 143 97 62
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
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