ccnp Flashcards
1
Q
- What is ARP?
A
The Address Resolution Protocol is a network protocol used to map MAC addresses to IP
addresses. All hosts on a network are located by their IP address, but NICs do not have IP
addresses, they have MAC addresses. ARP is the protocol used to associate the IP address to
a MAC address.
When a host wants to send a packet to another host, say IP address 10.1.1.1, on its local
area network (LAN), it first sends out (broadcasts) an ARP packet. The ARP packet contains a
simple question: What is the MAC address corresponding to IP address 10.1.1.1?
The host that has been configured to use the IP address responds with an ARP packet
containing its MAC address.
