r IP addressing, DNS, and DHCP manage- ment, as shown in Figure 4-13. It eliminates problems typically associated with IP management by automating and integrating address assignment. You do not need to manually configure addresses and no errors appear. No duplication of address assignment occurs. Dynamic DNS updates are performed by the server. The Domain Name Server is a distributed Internet/intranet directory service that translates domain names to IP addresses and vice versa. The lists of domain names are distributed over the Internet in a hierarchy (tree structure) of authorities (name servers). The Domain Name System is the addressing system of the Internet. Using DNS, your computer determines what IP address (for example, the fictional address 192.168.10.2) corresponds with a particular computer Figure 4-13 The DNS and DHCP functions in GPRS networks. http://www.tcic.com What is the IP address Internet www.tcic.com? DNS-DHCP: 192.168.10.2= www.tcic.com 192.168.10.2 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Function of GPRS Elements Chapter 4 hostname (for example, www.tcic.com). Your computer learns how to get to any IP address on the Internet, and uses that IP address to determine where it should send messages. The Domain Name Server is responsible for maintaining the addresses of all networks and nodes and the IP address translations for them. This server is a distributed name/address mecha- nism used on the Internet. A domain is part of the Internet naming hierarchy. Syntactically, an Internet domain name consists of a sequence of names (labels) separated by periods: for example, mail.smtp.idsweb1.com.us When a user enters a plain-text address, the Domain Name Server is called upon to translate the text-based address into an IP addressing scheme. The DNS then returns the numerical IP address using the address.subnet.node using