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CompTIA’s Network+ certification Study Guide part 57 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. | 546 CHAPTER 11 Network Troubleshooting Tools FIGURE 11.18 Ipconfig all Output. the most up-to-date DNS information. The command ipconfig displaydns will show you the contents of the local DNS cache. After typing ipconfig displaydns at the command prompt you ll see output similar to what is displayed in Figure 11.19. The command ipconfig registernds will refresh DHCP leases for all NICs on the machine and will reregister the machine s hostname and IP address with the DNS server. The is a helpful switch to use when you ve made changes to the local machine s IP address configuration and need to quickly reregister the new information with the DNS server. Utilizing the nslookup Command The nslookup utility allows you to test and query the records stored in your DNS server. You can use nslookup in command mode to perform a single query or in interactive mode to perform multiple queries. For example if you enter the command nslookup www.smeekers.com you ll see the output depicted in Figure 11.20. You can use any hostname in place of the one listed in this example to see nslookup in action. As you can see you get returned to the command prompt once you receive the information - this is typical of using nslookup in command mode. To enter interactive mode just type nslookup at the command prompt and your output will look like the example in Figure 11.21. Windows Tools 547 FIGURE 11.19 I pconfig displaydns Output. 548 CHAPTER 11 Network Troubleshooting Tools FIGURE 11.20 Nslookup Command Mode Example. FIGURE 11.21 Nslookup Interactive Mode Example. Notice that you re not returned to the command prompt but instead you remain at the nslookup command s interactive prompt which is represented with a symbol. Once you enter interactive mode you can use the set commands to control the information that s returned by your queries. The set commands available in nslookup are as follows set all Prints options current server and host. set no debug Prints debugging information. set debug .