Troubleshooting TCP/IP Fundamentals (TTCP)

Kursinhalt

• Einführung ins Troubleshooting
• Basiskonfigurationen
• Troubleshooting-Tools
• Cisco- und Juniper-Geräte
• TCP/IP-Überblick
• Troubleshooting-Methoden

Voraussetzungen

Inhalte des Kurses Networking & TCP/IP Fundamentals (NWF)

Zielgruppe

• Netzwerkadministratoren und alle sonstigen technischen Mitarbeiter, die für die Planung, Implementierung und den fehlerfreien Betrieb von TCP/IP-Netzwerken verantwortlich sind

Detaillierter Kursinhalt

Introduction to Troubleshooting

• Network Management
• Network Management Tools and Software
• Key Management Areas
• ISO Functional Areas
• OSI Model
• Overview of Layer Functions
• OSI and TCP/IP Models Compared
• Example Protocols at each Layer

Basic PC Configuration

• Twisted Pair Problems
• Ethernet Full & Half Duplex
• Ethernet Auto Sense or Auto Negotiate?
• Auto Sense
• Auto Negotiate
• Symptoms of Duplex Mismatch
• Duplex Settings on a Standard NIC (MS Windows)
• Switch Functionality
• Switch Monitor or Mirror Port
• Spanning Tree
• Address & Name Resolution
• IP Configuration MS-Windows
• Advanced DNS Settings MS-Windows
• MS-Windows Local Name Resolution
• View IP Configuration: ipconfig/all
• Additional IP ipconfig Functions
• Dynamic Host Configuration Protocol
• Automatic Private IP Addressing (APIPA)
• ARP Cache: arp -a

Troubleshooting Tools

• Troubleshooting Tools
• ICMP
• Type 3: destination unreachable
• Ping
• ICMP Redirect Message
• Traceroute
• Graphical Traceroute Examples
• NSLOOKUP
• NETSTAT
• Cable Tester/LAN Meter
• Protocol Analyzer
• SNMP
• Private MIB Object Example
• SNMP/MIB Implementation Example
• Your Brain

Displaying Information on Cisco & Juniper Devices

• Cisco Wake-up Screens (router)
• Cisco show Commands (router)
• Cisco show Commands (switch)
• Cisco show cdp neighbor (s or r)
• Cisco show cdp neighbors detail
• Cisco show ip interface brief (r)
• Cisco show ip protocols (router)
• Cisco show ip route (router)
• Cisco show ip arp (router)
• Cisco show controllers serial x
• Cisco show interface x (switch)
• Cisco show running-config (r)
• Cisco show running-config (s)
• POST failure
• JUNOS OS: Logging In
• CLI Modes
• Entering Configuration Mode
• Committing a Configuration
• Initial Configuration
• Viewing the Results
• Interface Naming
• Interface Configuration Example
• Tracking Interface State
• Extensive Output Example
• Network Utilities: Part 1
• Network Utilities: Part 2
• Network Utilities: Part 3
• Displaying the Junos OS Release
• Display Routing Information

TCP/IP Overview

• Overview
• TCP/IP is almost never a fault
• 50% of network problems are hardware-related
• 49% of network problems are configuration errors
• If ping works ...
• MS-Windows network cannot find neighbors
• MS-Windows sees no other PCs
• Using ping effectively

Troubleshooting Methods 1

• Before the trouble starts...
• OSI Model Overview
• Know your protocols and OSI layers
• Baselining
• Know your devices
• Know your applications
• Know your troubleshooting tools
• Graphical Device Management Tools
• Documentation & Archiving

Troubleshooting Methods 2

• So, the trouble has started...
• Before you change anything ...
• Pay attention
• Ask questions
• What to look for with a protocol analyzer
• Sherlock Holmes' Principle
• Before changing anything ...
• Control the process
• Change one variable at a time