Beck DB240 Manual de usuario descargar pdf (Pagina 33)

IPC@CHIP

DK241

Getting Started V1.02

3.6.5 IPv4 Basics

On an IP network IP addresses are used to define the source and the destination of a data

packet. An advantage of IP addresses is that they also hold information on a device‟s physical

location in a large network. This is best explained by an example:

Suppose you have the address 172.30.10.50 and the network mask 255.255.240.0. Let‟s look

at this data in binary format:

IP address

172.30.10.50

10101100.00011110.00001010.00110010

Network mask

255.255.240.0

11111111.11111111.11110000.00000000

Logical AND of both

10101100.00011110.00000000.00000000

The first 20 bits of the network mask are 1. This means that the first 20 bits of the IP address

identify the network. The last 12 bits (those that are 0 in the network mask) identify the device

within this network. This means that in the given example we can give the devices in our

network the addresses 172.30.0.1 through 172.30.15.254. The lowest (here 172.30.0.0) and

the highest address (here 172.30.15.255) of a network are reserved and cannot be assigned

to a host. The lowest address identifies the network, the highest one is a broadcast address,

used for a broadcast to all devices on this section of the network. Messages sent to this

address are received by all devices.

Any address that is not within the range of the current network is passed to the gateway

address (the router). A gateway is a physical machine, hardwired into two or more physical

networks. It knows how to transfer an IP packet from one network to another.

You can find the network configuration of the network that you are connected to by entering

the command IPCONFIG in a Windows command shell.

On a network, no two devices are allowed to have the same address.

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Beck DB240 Manual de usuario Pagina 33