SPARCbook Portable Workstation User Guide
8-7
Using the Network Interface
An Overview of TCP/IP Networking and the Internet
For example, a company attached to the .com domain could have the
address:
anyco.com
The diagram in Figure 8-3 shows three fictitious commercial
organizations attached to the
.com
domain. An individual computer
called
medoc
attached to a LAN segment within the company called
anyco would have the address:
medoc.anyco.com
Individual users can be addressed using this scheme. For example, a
user called Betty Small who uses
medoc
at
anyco
, might have the
address:
betty_small@medoc.anyco.com
Simpler email addresses may be recognized by a mail server which uses
database files to recognize the intended destination from Betty Small’s
email address of:
betty_small@anyco.com
Accessing the Internet
To allow access to computers attached to other networks or to the
Internet, a router or gateway is normally required. The router or
gateway functions are are performed by computers with multiple
network connections which provide the necessary link between the
Internet and an organization’s internal LAN segments. They ensure that
data packets are routed according to destination. A gateway may also be
used to provide security against unauthorized intrusion.
Figure 8-3 Internet Domains
.org
.edu
.com
.gov
.anynews
.anyco
.anybank
S3UG4_Book Page 7 Friday, August 8, 1997 11:37 am
