Specifications

A - 8 RSLinx – Training Guide
3) How is the TCP/IP Address formatted?
A TCP/IP address is comprised of 32-bits of information. These 32-bits
are then divided into four 8-bit sections. These sections are referred to
as octets. The octets are typically displayed in decimal format (i.e.
131.150.186.10). This type of format is commonly referred to as dotted
decimal notation. Octets can also be displayed in binary format (i.e.
10000011.10010110.10111010.00001010).
4) What are the Network Address and the Node Address?
To allow for efficient routing over the Internet, the TCP/IP address
format was broken into two parts. The first part is the Network
Address. The Network Address is used to uniquely identify each
network. Every host in the same network shares the same Network
Address. The second part is the Node Address. The Node Address
uniquely identifies each host on the network. The Node Address is
commonly referred to as the Host Address.
5) What are Network Classes?
Network Classes are used to help determine how to subdivide the
TCP/IP address into the Network Address and the Node Address. The
three most common Network Classes are Class A, Class B, and Class
C. The Network Classes were created based on the actual network
size. Depending on the number of required hosts in the network, this
determines which Network Class will be assigned.
6) How do I know which Network Class I am using?
In order to ensure efficient routing between different Network Classes,
only the leading bit pattern of the first octet is used to distinguish
between the different Network Classes. To decipher the leading bit
pattern of the first octet, you must convert the octet from decimal to
binary format.
The Class A network has the first octet with the leading bit pattern 0.
The Class B network has the first octet with the leading bit pattern 10.
The Class C network has the first octet with the leading bit pattern 110.