O'Reilly logo

IP Routing Primer by Robert Wright

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

ARP Explained

All layer three network protocols must have a method for mapping layer three addresses to their corresponding layer two addresses (typically a MAC address) for point-to-point data transfer. In this case, point-to-point means that only two hosts are participating in the data transfer. The other options, such as point-to-multipoint (Internet television or radio broadcasting) and multipoint-to-multipoint (TCP/IP-based videoconferencing), are beyond the scope of this book.

Consider an IP host that is trying to initiate a TCP/IP application session, such as FTP with another IP host. The initiating host first checks its ARP table (a cache of known IP address/MAC address associations) to see whether it already has the correct MAC address ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required