TCP/IP - Transport Control Protocol/Internet Protocol
A set of rules for communication between computers where each device (host)
is assigned a unique IP address which is valid on a particular network.
An IP address is made up of 4 "octets" ranging between 0 and 255,
and separated by a period or dot.
DHCP - Dynamic Host Configuration Protocol
If you get your IP address dynamically, then DHCP is used. Simply put, the
PC requests an IP address and the DHCP server on the network "leases" one out of its available pool of addresses. You can find out information
about your currently assigned address, DHCP server, DNS servers (see
below), and more using the WINIPCFG command (Windows 95/98),
or IPCONFIG (Windows NT/2000/XP).
DNS - Domain Name System
Every device on the Internet is assigned an IP address, but navigating to
them using their 12-digit IP address would be very cumbersome. DNS allows
a domain name to be used as a pseudonym for a specific IP address. (i.e.
www.mistupid.com). When you type in a web site name, your system
looks up the name on an assigned DNS server and resolves it to its IP address.
It can then access the web site. The PING command can be used to
check if a domain name is resolving to an IP address, and if that IP address
can be reached from your machine.
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