Crestron C2ENET-2 Installation Guide download pdf (Page 29)

Crestron C2ENET-1/-2 2-Series Ethernet Interface Expansion Cards

NETWORK ADDRESS

A network address is a pattern of bits in IP address format that is shared by all

network devices on a given local network. For example, network address

192.168.2.0 describes the local network where all devices have an IP address of

192.168.2.x, where x is any value from 1 to 254.

ROUTER

Router is a communications device which routes data between networks.

SUBNET MASK

A mask simply conceals something. With respect to an IP address, a mask is simply

a screen of numbers that reveals a set of numbers on which to focus. For example,

consider the IP address 150.215.017.009. Assuming this is part of a Class B network,

the first two numbers (150.215) represent the Class B network address, and the

second two numbers (017.009) identify a particular host on this network. Therefore,

the subnet mask is the network address plus the bits reserved for identifying the sub

network. (By convention, the bits for the network address are all set to 1, though it

would also work if the bits were set exactly as in the network address.) In this case,

therefore, the subnet mask would be 11111111.11111111.11110000.00000000. It's

called a mask because it can be used to identify the subnet to which an IP address

belongs by performing a bitwise AND operation on the mask and the IP address. The

result is the sub network address:

Subnet Mask 255.255.240.000 11111111.11111111.11110000.00000000

IP Address 150.215.017.009 10010110.11010111.00010001.00001001

Subnet Address 150.215.016.000 10010110.11010111.00010000.00000000

The subnet address, therefore, is 150.215.016.000.

TCP/IP

TCP/IP is the acronym for Transmission Control Protocol/Internet Protocol. It is a

standard set of protocols that govern the basic workings of the Internet that was

implemented in 1982.

The TCP part is all about ensuring that data is transmitted correctly between two

computers. If any errors occur these are detected and the data is retransmitted. The

data transmitted is split up into small portions referred to as data packets. The IP part

of TCP/IP is how these data packets are moved from one point to another. Each

computer on the Internet has a unique IP address and the data packets are moved

from the source to the destination through many different computers that are

controlled via TCP/IP. This protocol is used on the Internet and also by computers

that are part of a LAN.

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Crestron C2ENET-2 Installation Guide Page 29