arp cache
CCNA
Host Forwarding Decisions: How Hosts Actually Route Their Own Traffic
Every networked device, whether it’s a dedicated router or an ordinary laptop, has to decide how to get a packet toward its destination. Routers specialize in this, but end hosts, PCs, servers, phones, make their own forwarding decisions too, using a much simpler process built on subnetting, a minimal routing table, and address resolution. This...
CCNA
Address Resolution Protocol (ARP) Explained
Every device on a network has both an IP address and a MAC address, and something has to bridge the two. That’s the job of the Address Resolution Protocol (ARP): mapping a known IP address to the MAC address a device actually needs to build an Ethernet frame. This guide covers exactly how that resolution...