© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Troubleshooting Your Network Networking for Home and Small Businesses – Chapter 9

ITE PC v4.0 Chapter 1 2 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public The Troubleshooting Process  Identify and describe troubleshooting process

ITE PC v4.0 Chapter 1 3 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public The Troubleshooting Process  Gathering Information

ITE PC v4.0 Chapter 1 4 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Top-Down Approach

ITE PC v4.0 Chapter 1 5 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Bottom-up approach

ITE PC v4.0 Chapter 1 6 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Divide-and-Conquer approach

ITE PC v4.0 Chapter 1 7 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public The Troubleshooting Process  Describe approaches to troubleshooting

ITE PC v4.0 Chapter 1 8 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Detecting Physical problems

ITE PC v4.0 Chapter 1 9 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity

ITE PC v4.0 Chapter 1 10 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Troubleshooting Utilites  Ipconfig: a console application that displays all current TCP/IP network configuration values  Ping: used to test the “reachability” of a host on an (IP) network  Netstat: displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics  Tracert: tool for displaying the route (path) and measuring transit delays of packets across an (IP) network  Nslookup: querying the (DNS) to obtain domain name or IP address mapping or for any other specific DNS records.

ITE PC v4.0 Chapter 1 11 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Ipconfig is a tool that displays all current TCP/IP network configuration values

ITE PC v4.0 Chapter 1 12 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Ping is administration utility used to test the reachability of a host on an IP network and to measure the round trip time for messages sent from the originating host to a destination computer.

ITE PC v4.0 Chapter 1 13 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Trace router is a diagnostic tool for displaying the route (path) and measuring transit delays of packets across an IP network.

ITE PC v4.0 Chapter 1 14 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics.

ITE PC v4.0 Chapter 1 15 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilities Used to Verify TCP/IP Connectivity  Nslookup

ITE PC v4.0 Chapter 1 16 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  Isolating connectivity issues

ITE PC v4.0 Chapter 1 17 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks

ITE PC v4.0 Chapter 1 18 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  Connection Problems

ITE PC v4.0 Chapter 1 19 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  Identify and describe radio issues with a wireless network.

ITE PC v4.0 Chapter 1 20 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  Identify and describe association and authentication issues within a wireless network.

ITE PC v4.0 Chapter 1 21 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  DHCP Issues.

ITE PC v4.0 Chapter 1 22 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Hardware and Connection Issues in Wired & Wireless Networks  Troubleshooting Integrated Router to ISP connections.

ITE PC v4.0 Chapter 1 23 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilizing the Troubleshooting Process for Documentation and Help Desk Interactions  Describe the importance of documentation

ITE PC v4.0 Chapter 1 24 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilizing the Troubleshooting Process for Documentation and Help Desk Interactions  Using outside sources of help

ITE PC v4.0 Chapter 1 25 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Utilizing the Troubleshooting Process for Documentation and Help Desk Interactions  Using the Helpdesk

ITE PC v4.0 Chapter 1 26 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Summary  Effective troubleshooting combines instinct, experience, and structured techniques to identify, locate, and correct network or computer problems.  Documentation is essential in effective troubleshooting, and should contain baseline information about the network.  A large proportion of networking problems relate to physical components.  Many networking problems can be identified with software utilities such as ping, tracert, and netstat.  In a network containing both wired and wireless connections, it is important to isolate the problem to either the wired or wireless network.

ITE PC v4.0 Chapter 1 27 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public