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Network Troubleshooting -75+ Real-World Incidents(ccna-Ccnp) - charlie - 01-19-2026
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![[Image: e1cc9da0f8974abe5c87bbc0ada18257.jpg]](https://i126.fastpic.org/big/2026/0119/57/e1cc9da0f8974abe5c87bbc0ada18257.jpg)
Network Troubleshooting -75+ Real-World Incidents(ccna-Ccnp)
Published 1/2026
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Language: English | Duration: 16h 37m | Size: 11 GB[/center]
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
Requirements
Basic understanding of computer networking fundamentals
Basic knowledge of IP addressing and subnetting
Familiarity with VLAN concepts and switching basics
Basic routing knowledge such as static routing and default gateway concepts
Basic experience with Cisco CLI commands (enable, configure terminal, show commands)
A laptop or desktop computer with internet access
Willingness to practice troubleshooting and follow along with lab demonstrations
Description
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 symptomsHow to choose the correct troubleshooting pathHow to verify Layer 2 and Layer 3 issuesHow to identify configuration mistakesHow to resolve incidents professionallyHow to reduce downtime in real networksEvery incident is explained with
roblem scenarioSymptomsVerification commandsRoot cause analysisStep-by-step fixFinal validationSwitching Troubleshooting Topics CoveredYou will troubleshoot real Layer 2 issues including:Interface up but no traffic passingAccess and trunk port misconfigurationVLAN creation and trunk allowed list problemsNative VLAN mismatchVoice VLAN issuesMAC address learning problemsMAC flapping issuesPort security violationsBPDU Guard blocking portsSwitching loops and broadcast stormsSTP root bridge and priority problemsPortFast configuration mistakesEtherChannel formation and load balancing issuesVLAN pruning problemsHSRP misconfiguration and failover issuesDHCP snooping blocking trafficDynamic ARP inspection dropsRoot guard blocking uplinksACL issues on switchesRouting Troubleshooting Topics CoveredYou will also troubleshoot real Layer 3 and routing failures including
efault gateway and static route issuesWrong next-hop configurationRouting table update problemsTraffic not flowing even when route existsAsymmetric routing problemsACL blocking routed trafficNAT failures and routing dependency issuesMultiple default route confusionARP resolution failuresProxy ARP issuesMTU mismatch and fragmentation problemsVRF misconfiguration issuesWAN link up but traffic not flowingBackup link and failover problemsDynamic Routing Protocol TroubleshootingYou will learn how to troubleshoot routing protocols such as:OSPF neighbor stuck in INIT, EXSTART, and LOADINGOSPF area mismatch and network type mismatchOSPF MTU mismatchOSPF routes not installingOSPF LSA flooding problemsBGP Troubleshooting TopicsAdvanced routing incidents include:BGP neighbor up but no routesBGP prefix not advertisedBGP route flappingBGP path selection issuesPrefix accepted but not installedBlackhole route misconfigurationWho This Course Is ForThis course is suitable for:L1 Network Support EngineersL2 Network EngineersL3 Network EngineersNOC EngineersNetwork Operations TeamsCCNA and CCNP studentsSystem administrators working with networksAnyone who wants to build strong troubleshooting skillsWhat You Will Gain From This CourseAfter completing this course, you will be able to:Troubleshoot real production network issuesHandle outages with confidenceUnderstand traffic flow behavior clearlyPerform faster root cause analysisImprove job performancePrepare better for interviewsWork effectively in enterprise and ISP environmentsPrerequisitesBasic understanding of:IP addressingVLAN conceptsRouting fundamentalsCisco CLI basicsNo 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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