ol used for reporting anomalous network conditions and setting network threshold values. X Windows is a popular protocol that permits intelligent terminals to communicate with remote computers as if they were directly attached. Network File System (NFS), External Data Representation (XDR), and Remote Procedure Call (RPC) combine to provide transparent access to 32 BITS Figure 7-26 UDP header. SOURCE PORT DESTINATION PORT LENGTH CHECKSUM 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. X.25, Internets, Intranets, and Extranets Chapter 7 remote network resources. The SMTP provides an e-mail transport mecha- nism. These and other network applications use the services of TCP/IP and other lower-layer IPs to provide users with basic network services. Network file services give access to files and data on remote or disparate network servers. Remote printing capability enables a user to send print files to a remote printer as though it were a local attached printer. Remote program execution enables a user to access and launch a program on a remote computing system, appearing as a locally attached terminal device. Name services uses the ARPs and RARPs to determine the addressing on a particular device on a network and host mechanism. Name services also include the translation from a unique naming convention to an IP address (for example, bud@tcic.com translates to 198.120.205.10). Networking windows systems enable the TCP stack to link devices as peers on a network accessible using a GUI. Terminal services enable the user to emulate a dumb terminal and access data in a form and format acceptable by the remote host. E-mail access for a SMTP makes e-mail a simple procedure between different systems. The IP Header The IP Version 4 header is attached to the datagram to get the information to the destination address, as shown in Figure 7-27. The advantages