Technology Overview
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with the numerical IP address, such as 208.67.219.230. Your computer will then use
that address in its IP packets to communicate with Google’s servers.
DHCP
DHCP (Dynamic Host Control Protocol) is the way a computer which is just joining
the Internet can find its own IP address and other information, such as the IP
addresses of the name server gateway to use.
When the network software is starting up, it sends out a DHCP message in an IP
message which has a special type of destination address called a Broadcast address.
This will be received by all computers connected to the same network segment and
one (or more) of them will reply, giving the IP address that should be used and other
information.
ARP
The ARP (Address Resolution Protocol) allows a networked computer to search for a
computer with a particular IP address. ARP is important on LANs, such as Ethernet,
where there may be many computers attached to the network, but IP packets should
only be sent to one of them.
To find another computer, an ARP message is sent saying "who has IP address
192.168.1.2?” All of the computers on the network will see that message, but only
the one with that IP address will respond, saying ”r;that’s me, at Ethernet address
12:34:56:78:9A:BC”. From then on, IP packets for 192.168.1.2 will be sent to
Ethernet address 12:34:56:78:9A:BC, so that only that computer will see them: all
the others on the network will filter out those packets.
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Summary of Contents for XTT 5000
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