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Complete Teaching of Network Troubleshooting by Arash Deljoo (Udemy.com)

Mastering Network Troubleshooting: A Comprehensive Guide to Efficient Diagnosis and Resolution

Created by: Arash Deljoo

Last updated April 2026

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What you will learn

  • Apply structured troubleshooting methodologies to diagnose and resolve networking issues efficiently across enterprise environments.
  • Troubleshoot Layer 2 switching problems, including VLANs, trunks, EtherChannels, SVIs, routed ports, and frame-forwarding/mac-table behaviors.
  • Identify and resolve filtering and security issues, including IPv4/IPv6 ACLs, prefix lists, uRPF, AAA, CoPP, and SNMP.
  • Diagnose IP addressing, connectivity, and path issues using tools like ping, extended ping, traceroute, and IP SLA/object tracking.
  • Troubleshoot dynamic routing protocols, including RIPv2, EIGRP/EIGRPv6, OSPF/OSPFv3, and OSPFv3 Address Families.
  • Analyze, verify, and troubleshoot BGP operations, including neighborship, route advertisement, best-path selection, and MP-BGP for IPv6.
  • Resolve route redistribution problems, including loops, suboptimal routing, multi-point redistribution issues, and redistribution filtering.

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Quality Score

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Overall Score : 92 / 100

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Course Description

Welcome to the "Complete Teaching of Network Troubleshooting" course, your comprehensive guide to mastering the art and science of network troubleshooting. Designed for both budding network professionals and seasoned IT experts, this course delves deep into the methodologies, tools, and best practices essential for diagnosing and resolving network issues efficiently.

Course Highlights:

  • Foundational Principles: Begin with a solid understanding of network infrastructures, exploring various topologies, protocols, and the OSI model's layers.

  • Systematic Troubleshooting Approach: Learn to identify, analyze, and resolve network problems using a structured methodology, ensuring minimal downtime and optimal performance.

  • Hands-On Tool Proficiency: Gain practical experience with industry-standard tools and commands, such as ping, traceroute, Wireshark, and network analyzers, to monitor and diagnose network health.

  • Real-World Scenarios: Engage with case studies and simulations that mirror common and complex network issues, preparing you for challenges in actual work environments.

  • Advanced Topics: Delve into specialized areas like VLAN troubleshooting, wireless network issues, and security protocol assessments to broaden your troubleshooting expertise.

Learning Outcomes:

By the end of this course, you will be able to:

  • Confidently diagnose and resolve a wide range of network issues.

  • Implement best practices to prevent future network problems.

  • Utilize troubleshooting tools effectively to monitor and maintain network health.

  • Apply learned skills in real-world situations, enhancing network reliability and performance.

Embark on this journey to become a proficient network troubleshooter, equipped with the knowledge and skills to keep networks running smoothly and efficiently.

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Instructor Details

Arash Deljoo

Arash Deljoo is a Network Engineer and Professional Instructor with over 20 years of experience in networking, network design, implementation, troubleshooting, and technical training.

Throughout his career, Arash has taught a wide range of Cisco technologies and certification tracks, including CCNA, CCNP Enterprise, CCIE-level networking, BGP, MPLS, Segment Routing, SD-WAN, IPv6, QoS, VPNs, and advanced network troubleshooting.

As a Udemy and LinkedIn Learning instructor, Arash has built an exceptional teaching portfolio, with 21 courses selected for Udemy Business and 9 courses published on LinkedIn Learning—a remarkable milestone in his professional teaching career. He has helped thousands of students and network engineers worldwide develop practical, job-ready skills.

His teaching approach focuses on clear explanations, deep technical understanding, and extensive hands-on labs, helping students prepare for certifications, advance their careers, and master real-world networking technologies.

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Reviews

4.6

321 ratings on Udemy

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By Thantsintun on 1/24/2026

Instructor is knowledgeable in the subject and can explain very well in detail. Highly recommended.

By William Slade on 10/7/2025

Great information provided. I like how the instructor is very detail regarding content being taught.

By Mohammad Murtaza Quraishi on 9/20/2025

یادگیری از یک فرد آگاه و متخصصی مثل شما در این زمینه برای من لذت‌بخش است. این صنف بسیار باکیفیت است. از شما بابت وقتی که برای تدریس این صنف صرف کردید، سپاسگزارم.

By Saheed Adeyanju on 5/17/2025

I have been looking for a video like this for long time. Well explain and appreciate you so much

By Orratai Suttipunt on 4/30/2025

เป็นหลักสูตรที่ยากมาก

By Thabo John Masango on 4/20/2025

Great job on making it halfway! Would you like to update your review?

By Somsak Polraksa on 2/19/2025

I consider myself a lifelong learner, and this lesson was a fantastic addition to my knowledge base. The instructor's passion for the subject was evident, and it was contagious. They went above and beyond to ensure that everyone understood the material, and they were always willing to answer questions. I learned so much, and I'm grateful for the opportunity to have taken this lesson. I encourage anyone who is interested in this topic to enroll. You won't regret it.

By User 403 on 12/31/2024

Amazing course, can't thank him enough for such valuable lessons.

By Luc Ian on 6/19/2024

Very detailed explaining . I think everyone, even with little experience, can understand these instructions in this course. Thank You!

By Mohammed Yasin on 12/13/2023

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