Page 131 - DCAP602_NETWORK_OPERATING_SYSTEMS_I

Unit 6: Domain Name System

sTLDs. If an application passes this review process, its sponsors can commence technical notes
and contract negotiations with ICANN for allocation and sponsorship of the desired top-
level domain.
Several organisations that have applied for these top-level domains have been formed
specifically for this purpose. These include The Travel Partnership Corporation and
DotAsia Organisation Ltd. The last expansion of top-level domains took place in 2000,
when ICANN created seven new top-level domains, including three sTLDs — `.aero’;
`.coop’ and `.museum’.

6.2 summary

DNS is critical to the operation of the Internet. When you enter www.some-domain.com in a Web
browser, it’s DNS that takes the www host name and translates it to an IP address. If you set up
a Debian system to act as a combination firewall, NAT, and home Web server you (and others if
you wish) can access the Web pages on it (such as your Web cam images) from a remote location
by entering the system’s IP address in the URL. The IP address would be whatever is assigned
to you by your ISP. If you have a broadband Internet connection without a static IP and have
no desire to have your own domain name, you can use a free service offered by dyndns.org to
set up a home Web/e-mail/ftp server. Given that a DNS server can host the zone files for many
different domains, each having two zone files, it needs a way to tell which zone files are for which
domains. It does this in the named.conf file which, like the zone files themselves, is located in the
/etc/bind directory.

6.3 keywords

BIND: Berkeley Internet Name Domain

DDNS: Dynamic DNS
DNS: Domain Name Server
FQDN: Fully Qualified Domain Name
LAN: Local Area Network
MX: Mail eXchanger
PTR: Pointer

URL: Universal Resource Locator

6.4 self assessment

Fill in the blanks:
1. Domain Name System (DNS) converts the name of a ......................
2. A DNS client doesn’t store DNS information; it must always refer to a ...................... to get
it.
3. Check for correct DNS operation when ...................... a problem involving the inability to
access an Internet resource.
4. The DNS servers you specify in your domain name ...................... application are the
authoritative DNS servers for your domain.
5. Easy DNS will not only host your ...................... on their DNS server, but register your
domain name all for $35/year.

LoveLy professionaL university 125