Network Troubleshooting -75+ Real-World Incidents(CCNA-CCNP)

Network Troubleshooting -75+ Real-World Incidents(CCNA-CCNP) | Udemy
English | Size: 11.0 GB
Genre: eLearning

Hands-On Network Troubleshooting With Real Switching & Routing Incidents For CCNA To CCNP Level Engineers(L1, L2 and L3)

What you’ll learn
Troubleshoot real-world network outages using structured troubleshooting methodology
Identify and fix Layer 2 switching problems such as VLAN, trunking, STP, EtherChannel, and port security issues
Diagnose interface-related problems including link up but no traffic flow, err-disabled state, and duplex mismatches
Resolve VLAN and trunk misconfigurations that cause connectivity failures
Analyze MAC address learning issues and MAC flapping problems
Detect and fix switching loops and broadcast storm scenarios
Troubleshoot STP root bridge problems and unexpected port blocking
Understand and resolve HSRP and gateway redundancy issues
Identify DHCP snooping and ARP inspection problems that block legitimate traffic
Troubleshoot inter-VLAN communication failures
Diagnose Layer 3 routing issues such as missing routes, wrong next-hop configuration, and default gateway problems
Troubleshoot static routing and routing table update issues
Analyze traffic flow problems even when routes are present
Identify asymmetric routing problems and fix traffic path issues
Troubleshoot ACL issues that block routed traffic
Diagnose NAT failures and understand routing dependency for NAT operation
Resolve multiple default route conflicts and route recursion issues
Troubleshoot ARP resolution failures and proxy ARP problems
Identify MTU mismatch and fragmentation-related packet drops
Work with VRF-based routing issues
Troubleshoot OSPF neighbor problems including INIT, EXSTART, LOADING, and FULL state issues
Identify and fix OSPF area mismatch, network type mismatch, and MTU mismatch problems
Troubleshoot OSPF route installation and LSA flooding issues
Troubleshoot BGP neighbor connectivity and routing advertisement problems
Identify BGP route flapping and unstable prefix issues
Understand BGP path selection behavior and unexpected routing decisions
Troubleshoot prefix filtering and blackhole routing problems
Use real Cisco CLI troubleshooting commands effectively
Perform root cause analysis instead of applying random fixes
Build confidence to handle live network incidents in enterprise environments
Improve problem-solving skills required for NOC and production support roles
Prepare for CCNA and CCNP troubleshooting scenarios and job interviews

In real production networks, configuration knowledge alone is not enough.
What truly matters is the ability to identify problems, isolate root causes, and fix network outages quickly.

This course is designed to teach you real-world network troubleshooting using 75+ practical switching and routing incidents based on Cisco enterprise environments.

Instead of only learning theory, you will work through actual network failure scenarios that engineers face in NOC, enterprise, and data center networks.

What Makes This Course Different?

Most networking courses focus on how to configure devices.
This course focuses on what to do when things break.

You will learn:

How to analyze network symptoms
How to choose the correct troubleshooting path
How to verify Layer 2 and Layer 3 issues
How to identify configuration mistakes
How to resolve incidents professionally
How to reduce downtime in real networks

Every incident is explained with:

Problem scenario
Symptoms
Verification commands
Root cause analysis
Step-by-step fix
Final validation

Switching Troubleshooting Topics Covered

You will troubleshoot real Layer 2 issues including:

Interface up but no traffic passing
Access and trunk port misconfiguration
VLAN creation and trunk allowed list problems
Native VLAN mismatch
Voice VLAN issues
MAC address learning problems
MAC flapping issues
Port security violations
BPDU Guard blocking ports
Switching loops and broadcast storms
STP root bridge and priority problems
PortFast configuration mistakes
EtherChannel formation and load balancing issues
VLAN pruning problems
HSRP misconfiguration and failover issues
DHCP snooping blocking traffic
Dynamic ARP inspection drops
Root guard blocking uplinks
ACL issues on switches

Routing Troubleshooting Topics Covered

You will also troubleshoot real Layer 3 and routing failures including:

Default gateway and static route issues
Wrong next-hop configuration
Routing table update problems
Traffic not flowing even when route exists
Asymmetric routing problems
ACL blocking routed traffic
NAT failures and routing dependency issues
Multiple default route confusion
ARP resolution failures
Proxy ARP issues
MTU mismatch and fragmentation problems
VRF misconfiguration issues
WAN link up but traffic not flowing
Backup link and failover problems

Dynamic Routing Protocol Troubleshooting

You will learn how to troubleshoot routing protocols such as:

OSPF neighbor stuck in INIT, EXSTART, and LOADING
OSPF area mismatch and network type mismatch
OSPF MTU mismatch
OSPF routes not installing
OSPF LSA flooding problems

BGP Troubleshooting Topics

Advanced routing incidents include:

BGP neighbor up but no routes
BGP prefix not advertised
BGP route flapping
BGP path selection issues
Prefix accepted but not installed
Blackhole route misconfiguration

Who This Course Is For

This course is suitable for:

L1 Network Support Engineers
L2 Network Engineers
L3 Network Engineers
NOC Engineers
Network Operations Teams
CCNA and CCNP students
System administrators working with networks
Anyone who wants to build strong troubleshooting skills

What You Will Gain From This Course

After completing this course, you will be able to:

Troubleshoot real production network issues
Handle outages with confidence
Understand traffic flow behavior clearly
Perform faster root cause analysis
Improve job performance
Prepare better for interviews
Work effectively in enterprise and ISP environments

Prerequisites

Basic understanding of:

IP addressing
VLAN concepts
Routing fundamentals
Cisco CLI basics

No advanced experience is required.

Who this course is for:

L1 Network Support Engineers who want to build strong troubleshooting foundations
L2 Network Engineers who want to improve problem isolation and root cause analysis skills
L3 Network Engineers who want to sharpen advanced switching and routing troubleshooting techniques
NOC Engineers working in monitoring and production support environments
Network administrators managing enterprise networks
CCNA and CCNP students who want hands-on troubleshooting experience
IT professionals moving into networking roles
System administrators responsible for network infrastructure
Anyone preparing for network engineering job interviews
Engineers who want real-world troubleshooting exposure instead of only theory
Face real network issues and want structured troubleshooting methods
Want to move from configuration-focused learning to problem-solving skills
Want to handle production incidents confidently
Want to improve your performance in NOC or enterprise support roles
Want to gain practical experience with switching and routing failures

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