第9章.网络排错.ppt

* Step 4 - Verify Default Gateway * * Step 4 - Verify Default Gateway * * Step 5 - Verify Correct Path * * Step 5 - Verify Correct Path * * Step 6 - Verify the Transport Layer * * Step 7 - Verify ACLs * * 0 Step 8 - Verify DNS * * * Chapter 9 Summary * * Establishing a Network Baseline, Cont. * * Measuring Data * * General Troubleshooting Procedures * * Gathering Symptoms * * Questioning End Users * * Using Layered Models for Troubleshooting * * Troubleshooting Methods * * Troubleshooting Methods * * Guidelines for Selecting a Troubleshooting Method 确定故障范围 分析故障症状 利用以往经验 有限 复杂 新故障 以前遇到过 自上而下法 自下而上法 分治法 * * * Cisco Networking Academy program Connecting Networks Chapter 9: Troubleshooting the Network * Software Troubleshooting Tools Software Troubleshooting Tools, Cont. * * Software Troubleshooting Tools Software Troubleshooting Tools, Cont. * * Software Troubleshooting Tools Software Troubleshooting Tools, Cont. * * Software Troubleshooting Tools Software Troubleshooting Tools, Cont. * * Software Troubleshooting Tools Software Troubleshooting Tools, Cont. * * Hardware Troubleshooting Tools * * Hardware Troubleshooting Tools * * Hardware Troubleshooting Tools * * Hardware Troubleshooting Tools * * Using a Syslog Server for Troubleshooting * * Physical Layer Troubleshooting * * Data Link Layer Troubleshooting * * Network Layer Troubleshooting * * Transport Layer Troubleshooting - ACLs * * Transport Layer Troubleshooting – NAT for IPv4 * * Application Layer Troubleshooting * * End-to-End Connectivity Problem Initiates Troubleshooting * * End-to-End Connectivity Problem Initiates Troubleshooting * * Step 1 - Verify the Physical Layer Input queue drops?- Input queue drops (and the related ignored and throttle counters) signify that at some point, more traffic was delivered to the router than it could process. This does not necessarily indicate a problem. That could be normal during traffic peaks. However, it could be an indication t