What ARP does | Network Fundamentals Part 15
What ARP does | Network Fundamentals Part 15
ARP, or Address Resolution Protocol, provides IP to MAC address mapping services. It works by using two messages, the request and reply.
When a host needs to know the MAC that belongs to an IP, it will broadcast the request message. The device that owns the IP will reply (unicast) with its MAC address. Any other host that gets the message will discard it.
Once the reply has been received, the IP to MAC mapping will be stored in the ARP cache, to make the process faster next time. But if the entry is not used, it will eventually be removed from the cache.
Also of use is GARP, which a host will use to preemptively notify the local network of its IP and MAC address. This increases efficiency.
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In the next few videos, we’re going to have a look at DHCP and DNS.
Overview of this video:
0:00 Introduction
0:26 What does ARP Do?
1:32 How Does ARP Work?
2:20 ARP Cache
3:40 RARP and GARP
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snmp protocol
