Learn Computer Networking

The What and How of Computer Networks
4 reviews
  • Brent Leekley Learning & Development (L&D)

    Brent Leekley is the owner of multiple technical and business websites, worked as computer network expert, and ran his family's brick-and mortar furniture store in Colorado, USA.

    As a Cisco Certified Internetwork Expert, market researcher running print, web, and broadcast campaigns, and business owner Brent has developed numerous low-to-no cost life/business hacks that save time, money and frustration.

    Brent's courses focus on finding the quickest way to attain skills that make immediate impact on your projects and habits.

    Brent lives with his family in Castle Rock, Colorado, USA.

  • Lifetime access to 50 lectures
  • 12+ hours of high quality content
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Learn Computer Networking

The What and How of Computer Networks
4 reviews


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I have friends who know nothing about computer networks who own stacks of off-the-shelf routers, hundreds of feet of cable, and every wireless card you could imagine.  And yet, they've failed to figure out that their internet connection will never get any faster if they don't buy service faster than the 768k down DSL.

Not to be arrogant about what I know about networking, but a network is much more than the jack in the wall you plug the cable into.  But for most people, the end-user, this is what the network is reduced to.  For the rest of us we want to know what makes this stuff work. What are the Computer Networking Basics, What are the components, what are the technologies, protocols, and rules of building reliable and resilient networks?

This Computer Networking Tutorial is built off of three other successful courses and contains monthly updates and live sessions that explore the technologies of computer networks.  You will be provided with lab topologies that you can build into Dynamips or GNS3 network emulation freeware.  Each lecture will walk-thru advanced technology demonstrations illustrating the proper implementation of the technology.  

    • Over 50 lectures and 12 hours of content!


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  • SECTION 1:
  • 1
    1 page
    Welcome to the course!
  • SECTION 2:
    What Is The Network?
  • 2
    The Network
  • 3
    The Network Supplementals
    1 page
    All materials referenced in The Network lecture can be found here.
  • SECTION 3:
    What Is The Network Engineer?
  • 4
    What Is The Network Engineer

    This lecture describes the role of the network engineer.  It describes the different responsibilities of the job role and expected compensation given level of experience and education.  It also describes how to gain free hands on experience to gain skillsets needed to be a successful network engineer.

  • 5
    The Network Engineer Supplementals
    1 page
    All materials referenced in The Network Engineer lecture can be found here.
  • SECTION 4:
    What Are The Skills?
  • 6
    What Are The Skills Of The Network Engineer

    In this lecture we describe the Knowledge Matrix and how to use it to map out study planning.

  • 7
    Knowledge Matrix
    104.5 KB
  • SECTION 5:
    CCNA Beginner Labs
  • 8
    Beginner Lab Navigate CLI
    2 pages
    This lab will introduce the user to the method for accessing a Cisco IOS router and provide introductory guidance in navigating the command line interface.
  • 9
    Beginner Lab Cisco Discovery Protocol
    2 pages
    In this lab we will configure CDP to see how the protocol functions and what it takes for Cisco devices to be discovered
  • 10
    Beginner Lab Setting A Cisco Router Banner Message
    2 pages
    This lab provides instruction on setting a banner in the Cisco IOS and describes the differences between the MOTD, Login, Exec, and Incoming Banner. You will also see how you can create dynamic notifications within your banner messages.
  • 11
    Setting A Cisco Router Banner Solutions
    1 page
    Solution Guide for the Setting a Cisco Router Banner Lab
  • SECTION 6:
    Critical Mass
  • 12
    Get Hands On For Free - GNS3

    In this lecture, we introduce you to GNS3 and Dynamips.  We show you how you can use the free program to learn most, if not all, of the skills to become a competent network engineer.

  • 13
    Demonstration GNS3 Lab Topology
    579.95 KB
  • 14
    Cisco Discovery Protocol

    This lecture quickly reviews the configuration and benefits of Cisco Discovery Protocol.

  • 15
    Tips For The Command Line Interface

    This lecture shows you how to quickly navigate the command line interface.

  • 16
    Creating VLANs On Cisco Catalyst Switches

    This lecture describes and demonstrates how to create VLANs on Cisco Catalyst Switches.

  • 17
    What Are VLANs

    This lecture introduces VLAN technology.

  • 18
    Virtual Trunking Protocol

    This lecture introduces VTP and how to use it to better manage VLAN creation in your switched networks.

  • 19
    Simulation: VLAN Trunking Protocol Configuration
  • 20
    Voice VLAN

    This lecture describes the dual VLAN configuration used when an interface has a Voice VLAN assigned.

  • 21
    Spanning Tree Protocol

    Spanning Tree Protocol creates redundant forwarding paths through your switched networks.  This lecture describes the protocol, and how it is used to create efficient layer 2 networks.

  • 22
    Rapid Spanning Tree Protocol

    This lecture details the protocol enhancements provided by RSTP.

  • 23
    Multiple Instance Spanning Tree

    MST allows for the grouping of VLANs into single instances of RSTP.  This provides less administrative overhead that is accompanied by RPVST+.

  • 24
    STP Optimizations

    There are limitations with STP and this lecture show some proprietary solution to work around the inherent protocol nuances.

  • 25
    Bundled Ethernet

    EtherChannel aggregates the bandwidth of redundant interfaces.  This lecture describes there operation and demonstrates how to configure them.

  • 26
    Unidirectional Link Detection

    UDLD provides loop protection in you network by identifying when an interconnect has become unidirectional.

  • 27
    Switchport Protect

    Protected switchports provide a security mechanism for interfaces in the same VLAN and prevents the connected end-hosts from communicating with eachother.

  • 28
    Port Security

    This lecture describes how you can limit the number of MAC addresses learned on a particular interface.

  • 29
    Err-Disable Recovery

    In the event that an interface has gone to err-disabled state, a recovery mechanism is available to automatically recover the interface without administrative intervention.

  • 30
    Storm Control

    This lecture describes storm control functionality and its configuration.

  • 31
    DHCP Snooping

    This lecture describes the security mechanism available in Cisco Catalyst switches that mitigates against rouge DHCP servers.

  • 32
    IP Source Guard

    This lecture describes IP Source Guard and its configuration.

  • 33
    Switched Port Analyzer

    SPAN allows for the mirroring of switchports for the purpose of capturing network packets.

  • 34
    Introduction to Frame Relay

    Frame Relay is a legacy WAN technology that is still widely used in corporate networks today.

  • 35

    IPv4 is the de facto transport protocol on the internet today.  Even though next generation protocol IPv6 is available, IPv4 will be around for decades to come.  Learn IPv4 addressing, subnetting and assignment in this lecture.

  • 36
    IP Subnetting Primer
    Basic walkthrough of the subnetting process.
  • 37
    Using VPCS In GNS3

    This lecture shows you how to emulate PC network functionality in GNS3 topologies.

  • 38
    Using Vyatta In GNS3

    This lecture demonstrates how to integrate Vyatta routing platforms into your GNS3 topologies.

  • 39
    Using Quagga In GNS3

    This lecture demonstrates how to integrate Quagga routing processes into your GNS3 topologies.

  • 40
    IOS Memory

    Memory in Cisco IOS devices is meant for very specific roles in the operating system.  This lecture reviews each type of memory and how it is used.

  • 41
    Demonstration GNS3 Lab Topology

    This lecture is a demonstration of GNS3 functionality.

  • 42

    This lecture introduces the concept of routing and how it is configured on routing platforms.

  • 43

    RIPv2 is a dynamic routing protocol that is used to dynamically exchange routes in small networks.

  • 44
    RIPv2 GNS3 Topology
    10.85 KB
  • 45
    Configure OSPF
  • 46
    Where is my config file?

    Here are a few tips on where to find your IOS config file and how quickly parse through it to find the information that you need quickly and efficiently.

  • 47
    Introduction to IPv6

    What is IPv6?  What do CCNA candidates need to know about IPv6?  This short lecture discusses the need for IPv6 and some of the benefits of the new internet transport protocol.

  • 48
    IPv6: Reading IPv6 Addresses

    This short lecture introduces you to the IPv6 address hexadecimal format and shortcut to make the addresses more readable.

  • 49
    IPv6 Address Types

    Introduction to Unicast, Multicast, and Anycast address types in IPv6.

  • 50
    Simulation: Cisco Catalyst Switch Initial Configuration

    This is a Flash lab simulation. For best performance, use on a Flash capable device in full-screen mode.


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  • Alex
    No Logical flow

    I'm sorry, but this is more of a "watch me" as opposed to teaching. There was no logical flow to the material and the instructor just jumped around a lot. Maybe if he creates a road map and stay on topic throughout the course it will probably be better. Also, for a class titled "Learn Computer Networking", it should build up from the basics and become more complex later. I found that the first module, "What is the Network?" to be good, but the course took a turn after that.

  • Matt McAlear
    A lot of CLI and lacking background knowledge

    Doesn't really talk about some of the core concepts of networking but goes into detail of a lot of topics before discussing the underling technology. Talks a lot about CLI commands but show them all segmented and separated without explaining well how to get to that same spot and how the network as a whole fits together.

  • Technical Resource Mgt. Co. Steven Alexander
    Free Lecture

    For a free lecture, this course is awesome, thank you for providing it.

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