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Appendix A: TCP/IP Tutorial
This section is design to guide you to gain a brief understanding to TCP/IP addressing
mechanism and the meaning behind the DL4500 IP configurations. TCP/IP suite is the
most commonly used Ethernet communication protocol in both industrial and commercial
networking applications. The protocol implements a two-level addressing mechanism in
order to assign a computer or other Ethernet device (1) its Node Address (Host ID), and
(2) its Network Address (Network ID). With the node address, the Ethernet device can
identify itself on a network; with the network address, the Ethernet device can identify
the network in which it belongs to, and facilitate communication among computers across
different networks.
Analogy
The node address is analogous to the suite number in an apartment, and the
network address is equivalent to the residential number of the entire apartment
building. When my friends want to visit me, I must give them both my suite
number and the residential number of the apartment in which I live in, else they
wouldn’t be able to find my place.
A.1 IP
Address
TCP/IP uses a four-segmented number set to store the node address and the network
address; the number in every segment varies from 0 to 255, and segments are separated
by decimal points. This segmented number set is called the IP Address, and has the
appearance of XXX.XXX.XXX.XXX.
Ex.
Here are some valid IP addresses:
192.168.2.1
(reserved for Local Area Network applications)
68.142.197.85 (www.yahoo.com)
64.233.187.99
(www.google.ca)
127.0.0.1
(Networking Interface Card Loopback IP)
