URL: https://role.rhu.redhat.com/rol-rhu/app/courses/cl110-16.1/pages/ch03
Reporter RHNID: ctiwary@redhat.com
Section: networking-tcpip-lecture - Reviewing TCP/IP Fundamentals
Language: en-US (English)||||||||
Workaround:

Description: This is not 100% correct : " For example, a device on Subnet A issues the ping command to a device on Subnet B. The device on Subnet A broadcasts a layer 2 ARP request. The request asks which device on the network can route a packet to the device on Subnet B. Because the devices are on different subnets, no local network device recognizes the address."

The more technically correct explanation / text should be :

Subnets are part of the Internet Layer. The device on subnet A will not broadcast a layer 2 ARP request to ask which device on the network can route a packet to the device on subnet B.

Instead the device on subnet A will look in its routing table for the ping target and will then find out that the target is on a remote network.

The ARP request is only used to get the MAC address of the router.