28
C
HAPTER
1: W
EB
C
ACHING
C
ONCEPTS
AND
D
EPLOYMENT
■
The second part identifies the device on that subnet.
The bits of the subnet mask are set to 1 if the device is to treat the
corresponding bit in the IP address as part of the original network
number or as part of the subnet number. These bits in the mask are set to
0 if the device is to treat the bit as part of the device number.
Domain Name System
The Domain Name System (DNS) maps a numerical Internet Protocol (IP)
address to a more meaningful and easy-to-remember name. When you
need to access another device on your network, you enter the name of
the device, instead of its IP address. A Domain Name System server on
your network is contacted and asked the electronic form of the question,
“What is the IP address of the destination device?”. The DNS server is a
machine that keeps track of all the names and their equivalent numeric IP
addresses. The DNS server responds with the correct IP address (e.g.
128.118.2.23), allowing the two devices to communicate with each
other.
To enable the Domain Name System, you must setup one or more DNS
servers on your network. If you are uncertain about how to do this,
contact your network administrator.
The following Webcache features are only available if you have setup a
DNS server:
■
Caching
— The Webcache will be unable to cache Web content if a
DNS server is not setup. The Webcache must resolve the host names
accessed by the Web browser in order to serve the content.
■
Access to the Webcache by DNS Name
— You can access the Web
interface or Command Line Interface of the Webcache via its DNS
name, rather than its IP address e.g. webcache.mycompany.com.
■
Web Proxy Auto-Discovery (WPAD)
— This protocol can be used to
configure Web browsers on client machines in a Proxy Cache
deployment. For further information, see
“Web Proxy Auto-Discovery
(WPAD)”
on
page 49
.
Domain Name System
Syntax
You must use the following syntax for the DNS host name and domain
name:
■
Host Name
■
The host name must be at least 1 character long.
dua1611-5aaa04.book Page 28 Friday, November 29, 2002 8:56 PM
Summary of Contents for SuperStack 3 WEBCACHE 1000
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Page 348: ...348 GLOSSARY dua1611 5aaa04 book Page 348 Friday November 29 2002 8 56 PM ...