TAILIEUCHUNG - CompTIA Network+ Certification Study Guide part 56

CompTIA’s Network+ certification Study Guide part 56 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. | 536 CHAPTER 11 Network Troubleshooting Tools In between the names of the routers in a tracert output you see a pipe character like this one 13 25ms 0 100 0 14 24ms 1 100 1 0 100 0 0 100 0 1 100 1 This represents the link between the router and the next-hop router. When there is a large percentage of lost pings for the link it indicates congestion on the network between hops. In this case you would want to investigate problems with network congestion rather than with the router itself. In Exercise you will use the pathping command to view the path to . EXERCISE Utilizing the pathping command 1. Log onto a Windows Vista machine. 2. Click on Start All Programs Accessories. 3. Right-click on the Command Prompt and choose Run as administrator. 4. In the User Account Control dialog box click Continue. 5. In the Administrator Command Prompt screen type pathping and hit Enter on the keyboard. 6. Watch the trace route complete and then wait for the statistics to be generated. 7. Review the output of the statistics. Utilizing the arp Command The arp utility allows you to view and manipulate entries in the TCP IP arp cache. The arp cache is a list of MAC addresses for computers that have been recently contacted. Their IP-to-MAC address mapping is stored by the local computer so it can be located again quickly. The arp utility is helpful when troubleshooting problems that are related to duplicate IP addresses or duplicate MAC addresses on a particular network segment. For example suppose that Computer A and Computer B have inadvertently been given the same IP address . Computer A Windows Tools 537 SECURITY ALERT The Dangers of Static ARP Entries Although they have their uses static arp entries can get you in trouble. For example a situation existed on a network where each client on a segment was able to connect to any other client on the segment but .

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