When investigating a user's network problem, it's helpful to start your analysis near the client machine.

Tony Fortunato explains how companies can safely use Telnet and SNMP v1/v2.

In this video, Tony Fortunato demonstrates how to use the popular network analyzer to track DNS problems.

Tony Fortunato demonstrates how to track TCP window size to troubleshoot network performance issues.

Find out how to check for selective acknowledgment when investigating network performance issues.

To ensure optimal performance, check your TCP maximum segment size.

Analyzing SYN packets can reveal actual response times, as Tony Fortunato demonstrates in this video.

Tony Fortunato demonstrates how to uncover HTTP issues via trace file analysis in this video.

In this video, Tony Fortunato explains how a router can lose its configuration when rebooted.

In this video, Tony Fortunato demonstrates a method for retrieving a WLAN password stored in a PC.

Don't risk equipment failure due to dust accumulation. In this video, Tony Fortunato demonstrates how to clean a router.

In this video, Tony Fortunato demonstrates how to conduct a basic wireless survey without WiFi survey tools.

In this video, Tony Fortunato demonstrates how Cisco IOS can misrepresent FTP configuration issues.

In this video, Tony Fortunato shows how to use the network protocol analyzer to troubleshoot a webpage error.

In this video, Tony Fortunato shows how TFTP can be problematic when transferring files between network devices.

Learn how to configure a Cisco router to protect it from ICMP attacks.