Troubleshooting TCP/IP Networks with Wireshark

Troubleshooting TCP/IP Networks with Wireshark Prerequisites

TCP/IP Networking

What You'll Get in Troubleshooting TCP/IP Networks with Wireshark

What You'll Learn in Troubleshooting TCP/IP Networks with Wireshark

Top 10 reasons for network performance complaints
Place the analyzer properly for traffic capture on a variety of network types
Capture packets on wired and wireless networks
Configure Wireshark for best performance and non-intrusive analysis
Navigate through, split, and work with large traffic files
Use time values to identify network performance problems
Create statistical charts and graphs to pinpoint performance issues
Filter out traffic for more efficient troubleshooting and analysis
Customize Wireshark coloring to focus on network problems faster
Use Wireshark's Expert System to understand various traffic problems
Use the TCP/IP Resolution Flowchart to identify possible communication faults
Analyze normal/abnormal Domain Name System (DNS) traffic
Analyze normal/abnormal Address Resolution Protocol (ARP) traffic
Analyze normal/abnormal Internet Protocol v4 (IPv4) traffic
Analyze normal/abnormal Internet Control Messaging Protocol (ICMP) traffic
Analyze normal/abnormal User Datagram Protocol (UDP) traffic
Analyze normal/abnormal Transmission Control Protocol (TCP) traffic
Analyze normal/abnormal Hypertext Transport Protocol (HTTP/HTTPS) traffic

Troubleshooting TCP/IP Networks with Wireshark Certification

WCNA: Successful completion of the WCNA Certification Exam (formerly referred to as the Wireshark Certified Network Analyst Exam) indicates you have the knowledge required to capture network traffic, analyze the results and identify various anomalies related to performance or security issues.?To earn the WCNA Certification status, you must pass a single Exam—the WCNA-200.x Exam.?The WCNA Certification Exam is available at hundreds of testing centers around the world. You can take your Exam at a KRYTERION High-stake Online Secure Testing (HOST) location. Register for the proctored WCNA Certification Exam online at www.webassessor.com/pai.??

Troubleshooting TCP/IP Networks with Wireshark Outline

1. Introduction to Network Analysis and Wireshark

• TCP/IP Analysis Checklist
• Top Causes of Performance Problems
• Get the Latest Version of Wireshark
• Capturing Traffic
• Opening Trace Files
• Processing Packets
• The Qt Interface Overview
• Using Linked Panes
• The Icon Toolbar
• Master the Intelligent Scrollbar
• The Changing Status Bar
• Right-Click Functionality
• General Analyst Resources
• Your First Task When You Leave Class

2. Learn Capture Methods and Use Capture Filters

• Analyze Switched Networks
• Walk-Through a Sample SPAN Configuration
• Analyze Full-Duplex Links with a Network TAP
• Analyze Wireless Networks
• USB Capture
• Initial Analyzing Placement
• Remote Capture Techniques
• Available Capture Interfaces
• Save Directly to Disk
• Capture File Configurations
• Limit Your Capture with Capture Filters
• Examine Key Capture Filters

3. Customize for Efficiency: Configure Your Global Preferences

• First Step: Create a Troubleshooting Profile
• Customize the User Interface
• Add Custom Columns for the Packet List Pane
• Set Your Global Capture Preferences
• Define Name Resolution Preferences
• Configure Individual Protocol Preferences

4. Navigate Quickly and Focus Faster with Coloring Techniques

• Move Around Quickly: Navigation Techniques
• Find a Packet Based on Various Characteristics
• Build Permanent Coloring Rules
• Identify a Coloring Source
• Use the Intelligent Scrollbar with Custom Coloring Rules
• Apply Temporary Coloring
• Mark Packets of Interest

5. Spot Network and Application Issues with Time Values and Summaries

• Examine the Delta Time (End-of-Packet to End-of-Packet)
• Set a Time Reference
• Compare Timestamp Values
• Compare Timestamps of Filtered Traffic
• Enable and Use TCP Conversation Timestamps
• Compare TCP Conversation Timestamp Values
• Determine the Initial Round Trip Time (iRTT)
• Troubleshooting Example Using Time
• Analyze Delay Types

6. Create and Interpret Basic Trace File Statistics

• Examine Trace File Summary Information
• View Active Protocols
• Graph Throughput to Spot Performance Problems Quickly
• Locate the Most Active Conversations and Endpoints
• Other Conversation Options
• Graph the Traffic Flows for a More Complete View
• Burst Statistics
• Numerous Other Statistics are Available
• Quick Overview of VoIP Traffic Analysis
• SIP and RTP Analysis Overview
• SIP Call Setup
• Analyzing Call Setup with SIP
• Session Bandwidth and RTP Port Definition

7. Focus on Traffic Using Display Filters

• Display Filters
• Filter on Conversations/Endpoints
• Build Filters Based on Packets
• Display Filter Syntax
• Use Comparison Operators and Advanced Filters
• Filter on Text Strings
• Build Filters Based on Expressions
• Watch for Common Display Filter Mistakes
• Share Your Display Filters

8. TCP/IP Communications and Resolutions Overview

• TCP/IP Functionality
• When Everything Goes Right
• The Multi-Step Resolution Process
• Resolution Helped Build the Packet
• Where Faults Can Occur
• Typical Causes of Slow Performance

9. Analyze DNS Traffic

• DNS Overview
• DNS Packet Structure
• DNS Queries
• Filter on DNS Traffic
• Analyze Normal/Problem DNS Traffic

10. Analyze ARP Traffic

• ARP Overview
• ARP Packet Structure
• Filter on ARP Traffic
• Analyze Normal/Problem ARP Traffic

11. Analyze IPv4 Traffic

• IPv4 Overview
• IPv4 Packet Structure
• Analyze Broadcast/Multicast Traffic
• Filter on IPv4 Traffic
• IP Protocol Preferences
• Analyze Normal/Problem IP Traffic

12. Analyze ICMP Traffic

• ICMP Overview
• ICMP Packet Structure
• Filter on ICMP Traffic
• Analyze Normal/Problem ICMP Traffic

13. Analyze UDP Traffic

• UDP Overview
• Watch for Service Refusals
• UDP Packet Structure
• Filter on UDP Traffic
• Follow UDP Streams to Reassemble Data
• Analyze Normal/Problem UDP Traffic

14. Analyze TCP Protocol

• TCP Overview
• The TCP Connection Process
• TCP Handshake Problem
• Watch Service Refusals
• TCP Packet Structure
• The TCP Sequencing/Acknowledgment Process
• Packet Loss Detection in Wireshark
• Fast Recovery/Fast Retransmission Detection in Wireshark
• Retransmission Detection in Wireshark
• Out-of-Order Segment Detection in Wireshark
• Selective Acknowledgement (SACK)
• Window Scaling
• Window Size Issue: Receive Buffer Problem
• Window Size Issue: Unequal Window Size Beliefs
• TCP Sliding Window Overview
• Troubleshoot TCP Quickly with Expert Info
• Filter on TCP Traffic and TCP Problems
• Properly Set TCP Preferences
• Follow TCP Streams to Reassemble Data 16. Examine Advanced Trace File Statistics
• Build Advanced IO Graphs
• Graph Round Trip Times
• Graph TCP Throughput
• Find Problems Using TCP Time-Sequence Graphs

15. Graph Traffic Characteristics

• Advanced I/O Graphing
• Graph Round Trip Times
• Graph TCP Throughput
• Find Problems Using TCP Time Sequence Graphs

16. Analyze HTTP Traffic

• HTTP Overview
• HTTP Packet Structure
• Filter on HTTP Traffic
• Reassembling HTTP Objects
• HTTP Statistics
• HTTP Response Time
• Overview of HTTP/2
• HTTP/2 Analysis Fundamentals
• HTTP /2 Frame Format
• Analyze Normal/Problem HTTP Traffic

17. Analyze TLS-Encrypted Traffic (HTTPS)

• Analyze HTTPS Traffic
• Encrypted Alerts
• Decryption Steps
• Filter on SSL

18. Review Your 10 Key Troubleshooting Steps

• Baseline "NormalTraffic
• Use Color
• Look Who's Talking: Examine Conversations and Endpoints
• Focus by Filtering
• Create Basic IO Graphs
• Examine Delta Time Values
• Examine the Expert System
• Follow the Streams
• Graph Bandwidth Use, Round Trip Time, and TCP Time/Sequence Information
• Watch Refusals and Redirections

Testimonials