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Appendix A: General Information Internet Access - Page 109
Appendix A: General Information
Internet Access
Internet access offers a number of business benefits - email and the exchange of
multimedia information, access to all kinds of services and information, and the
opportunity to create a global presence with your own web site. The role of your
system in providing Internet Access is shown in the diagram below. The Internet
Service Provider (ISP) provides you with a gateway to the global network which is
the Internet. The ISP has:
– a Remote Access Server (RAS), for you to dial in to
– a Domain Name Server (DNS), which converts your “public” name (e.g.,
www.Avaya.com) into the unique Internet Protocol (IP) address by which you
are recognised on the global network
– a Mail Server, for collection and delivery of your mail
– a Web server, to provide you with space for your own web pages
– switches and routers - the equivalent of the Internet’s telephone exchanges -
which send and receive data packets across the network. The Internet itself
is like a mesh with these devices at each of its nodes.
You can access the Internet in two ways:
By dialling in via the public phone network (the usual method) or
Over a permanent leased line (the IPNC can support this by means of its Wide
Area Network (WAN) port).
For ISDN dial-in Internet access, your system has a “bandwidth on demand”
facility, that uses additional ISDN channels when and if they are needed. This is
very cost-effective way to manage call costs as there is no wastage and also no
restriction on user access. By means of Network Address Translation (NAT),
many users can access the Internet at the same time.
When you set up an account with an ISP, you are given the details you need to
set up your system for Internet access. One Internet service is set up as part of
the basic configuration and you may add others as new Services (see Data
Routing below).
The World Wide Web (WWW) is the user interface to Internet services and
information. To access this, you need a browser, such as Netscape. You also
need a search engine, such as Yahoo, to look for information when you have not
been given a specific address. These applications are installed on PC’s for users
with Internet access. To use email, you need an email server on your Local Area
Network (LAN) and the corresponding software on each user’s PC for mail
collection.
INDeX IPNC Cassette Administration Manual Appendix A: General Information - Page 109
38DHB0002UKDD – Issue 7 (22/11/02) Internet Access