CompTIA’s Network+ certification Study Guide part 64 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 616 CHAPTER 12 Network Troubleshooting Methodology for example how much hard disk space is available . To install the SNMP service on a Windows computer you need to be logged on as a member of the Administrators group. The SNMP agent software is installed as a Windows Component and runs as a service. Exam Warning SNMP management software is not currently included with the Windows operating system and has to be purchased and installed separately. Telnet Telnet is a TCP IP-based service that allows users to log onto a computer from a remote location run character-mode or command-line utilities on the remote computer or device and view files on a remote device. Windows 2000 and 2003 Server computers include both Telnet server and Telnet client software while Windows client operating systems such as Windows 2000 and XP Professional only include the Telnet client. Telnet differs from FTP in that you cannot transfer files from one computer to another upload or download . Telnet is often used to access a UNIX shell account on an ISP s server and delete e-mail messages directly from the server without downloading them to the local machine. The Telnet server service uses TCP port 23 to listen for Telnet requests. Exam Day Tip Because it usually sends usernames and passwords in clear-text the use of Telnet has been almost entirely superseded by Secure Shell Host SSH . If you are troubleshooting a remote device like a router or a switch you can use SSH for better security whenever required. SMTP The Simple Mail Transfer Protocol is used for sending e-mail messages typically across the Internet. SMTP is a simple ASCII protocol and is not vendor-specific. Because SMTP has limited capability in queuing messages at the receiving end most e-mail client programs use SMTP for sending e-mail only and either Post Office Protocol version 3 POP3 or Internet Message Access Protocol IMAP for storing any messages that are received by an e-mail server. The SMTP service uses TCP port 25 to .
