Network Troubleshooting & Monitoring

Module 1: Troubleshooting Methodology

• Structured troubleshooting approaches: Top-down, bottom-up, divide and conquer
• OSI model-based troubleshooting framework
• Problem documentation and ticketing
• Escalation procedures
• Root cause analysis (RCA) methodology

Module 2: Layer 1 and Layer 2 Troubleshooting

• Physical connectivity issues: Cable, port, SFP
• Interface statistics: CRC errors, input/output drops, runts, giants
• Duplex and speed mismatch
• STP issues: Loops, TCN floods, blocked ports
• VLAN and trunk troubleshooting

Module 3: Layer 3 Troubleshooting

• IP addressing and subnet mask errors
• Routing table verification
• OSPF troubleshooting: Neighbour state, LSA, SPF
• EIGRP troubleshooting: Neighbour, DUAL, stuck in active
• BGP troubleshooting: Session establishment, prefix filtering

Module 4: Packet Capture and Analysis

• Wireshark: Advanced filters, display filters, statistics
• tcpdump for CLI packet capture
• Cisco EPC (Embedded Packet Capture) on IOS-XE
• Analysing TCP issues: Retransmissions, window scaling, RSTs
• Capturing and analysing application protocol issues

Module 5: Network Monitoring Tools

• SNMP monitoring: SolarWinds NPM, PRTG, Zabbix
• Syslog centralisation and analysis
• NetFlow/sFlow for traffic analysis: SolarWinds NTA, ntopng
• ICMP monitoring and availability checks
• Bandwidth utilisation monitoring and alerting

Module 6: Network Performance Monitoring

• Latency measurement: Ping, traceroute, MTR
• Jitter and packet loss measurement
• iPerf for bandwidth testing
• IP SLA on Cisco: RTT, jitter, packet loss measurement
• Network baselining

Module 7: DNS and DHCP Troubleshooting

• DNS resolution failures: nslookup, dig, host
• DNS propagation issues
• DHCP starvation and exhaustion
• DHCP lease conflicts and duplicate IP
• DHCP snooping and ARP inspection issues

Module 8: Wireless Troubleshooting

• Wireless client connectivity issues
• Channel interference analysis
• Association and authentication failures
• Roaming issues: Fast BSS transition problems
• Wireless site survey vs. post-deployment issues

Module 9: Security Monitoring

• NetFlow analysis for anomaly detection
• IDS/IPS alert triage
• Firewall log analysis for connectivity issues
• DDoS detection and response
• Security event correlation

Module 10: Cloud Network Monitoring

• AWS CloudWatch for VPC monitoring
• Azure Network Watcher diagnostics
• GCP Network Intelligence Centre
• Third-party cloud monitoring: Datadog, New Relic
• Hybrid network monitoring strategies

Module 11: NOC Operations

• NOC (Network Operations Centre) role and workflow
• Incident, problem, and change management in NOC
• SLA management and escalation
• On-call procedures and runbooks
• NOC tooling: ServiceNow, JIRA for network incidents

Module 12: Capstone Projects

• Troubleshoot a complex multi-layer network fault in a lab
• Build a network monitoring dashboard with PRTG or Zabbix
• Wireshark analysis challenge: Identify and diagnose 5 network issues
• NetFlow traffic analysis project
• Certification preparation: CompTIA Network+, Cisco DevNet, CCNP ENARSI

Experience in the Industry Learn from network engineers with extensive NOC and enterprise support experience, specialising in systematic troubleshooting, performance monitoring, and network operations.

Backgrounds at the Top Our instructors have served as network operations leads and L3 network support engineers at ISPs, data centres, and large enterprises, with certifications including CCNP, CompTIA Network+, and Wireshark Certified Network Analyst.

Clear & Effective Teaching Troubleshooting scenarios are presented as realistic fault scenarios that students solve step by step using structured methodology and real tools.

Hands-On Learning Focus Students troubleshoot 20+ simulated network faults, perform Wireshark captures, configure SNMP monitoring, analyse NetFlow, and build NOC runbooks.

Up-to-Date Knowledge Instructors stay current with cloud network monitoring tools, updated Wireshark features, modern NOC tooling, and new Cisco IOS-XE troubleshooting commands.