Essential Computer Science: A Programmer’s Guide to Foundational Concepts by unknow

Author:unknow
Language: eng
Format: epub
Tags: computers, Computer Science, Programming, General
ISBN: 9781484271063
Google: LvFhzgEACAAJ
Publisher: Apress
Published: 2021-06-12T23:50:55.940747+00:00

The Dynamic Host Configuration Protocol or DHCP is a protocol to dynamically assign IP addresses to hosts on a LAN or IP segment. It is very common to use DHCP on local area networks so a person does not have to explicitly assign IP addresses to every host on the network.

With DHCP, the host sends out a DHCP service discovery message on the network. When a DHCP host receives a service discovery message, it responds with an IP address for the requesting system, the network mask, and the IP address lease time.

A network mask is a bit pattern that indicates which bits in the IP address cannot change. This indicates the range of possible IP addresses the host can reach. The network mask is sometimes called the subnet mask because it defines the subnet that the host is part of. A subnet is one or more hosts connected to a router. As an example (Figure 5-8), we have two subnets 143.11.38.0/24 and 143.11.40.0/24, where the first 24 bits or three fields of the IP addresses in the subnets will be the same.

Figure 5-8Two Subnets Connected to a Router

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