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Posted on 2004-09-11
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What is the difference beween a DNS DHCP?
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Question by:jahsexy18
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PsiCop earned 250 total points
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You mean "between AND *and* DHCP"?

DNS = Domain Name System

DHCP = Dynamic Host Configuration Protocol

DNS is a tool for translating host names (e.g. www.experts-exchange.com) into IP addresses (e.g. 64.156.132.140) - and vice-versa. It can also carry application-specific information (e.g. what is the Mail eXhanger for the Domain experts-exchange.com?) In sum, its a roadmap for computers to communicate across the Internet, a sort of phone book so when Computer A needs to talk to Computer B, A has a way of finding B's "phone number", or IP address.

DHCP is a tool to automate IP address and TCP/IP stack configuration for hosts on a subnet. If you don't have a static IP address assignment, then your ISP uses DHCP to assign your computer an IP address, and probably to provide it with other information (such as addresses of nameserver, a default gateway, etc.) In corporate environments, DHCP can be used to automatically give computers information about the corporate network, such as the address of Service Location Protocol servers, timeservers, lotsa stuff - there's something like 80 optional fields defined for DHCP (never met anyone who use them ALL - I only use about 6 or 8 in my network designs).

Anyway, they are two very different tools, but the same in that they leverage to flexibility of TCP/IP to deliver a wide range of services atop a standard protocol set.
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