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Cisco Networking Tutorials for Beginners and Experts

My name is Harris Andrea and I would like to extend a warm welcome to you.

About me in a few words.

Let me tell you a story. When I was in my last year in University (in the late 90’s) I had to take some courses around TCP/IP and computer networking.

That was the time that something clicked in my mind. I don’t know if it was my professor’s teaching skills and enthusiasm about the subject, but after finishing those courses I knew that IP networking was the field I wanted to explore more in my professional career.

After graduating, I started working in a relatively small but high-caliber technology company that was a Cisco Gold Partner.

I was absorbing experience and information like a sponge. I got involved in all sorts of projects in designing and implementing networks based mainly on Cisco products and other high-profile vendors. That job was like a second University degree for me but in a more practical way.

After working there for almost 5 years, I moved on and got a new job in a big Internet Service Provider (ISP) where I’m still working until today.

During all these years in my new job I have been responsible for operating, supporting and designing huge networks that contain carrier-grade routers and switches, firewalls, intrusion prevention systems, management and monitoring systems, security infrastructure devices and anything that can be found in an ISP environment.

About this Website

About 15 years ago, I decided to create a blog to share my experience in the form of Cisco networking tutorials, configuration examples, guides, tips, industry news etc for both beginners and experts. This is how this blog was born.

If you want to receive Cisco tutorials, configuration guides and other networking and security related topics from me, subscribe below to join over 18,000 other professionals that receive my emails.

If you want to explore my blog, scroll until the end of this post to see my latest articles or click on a category to the right for all the topics I have written related to Cisco technologies, network and information security, general networking etc.

By subscribing below I will send you also three Cisco cheat sheet PDF files about the following:

• Cisco Routers Commands Cheat Sheet.
• Cisco Switches Commands Cheat Sheet.
• Cisco ASA Firewall Commands Cheat Sheet.

Download Free Cisco Commands Cheat Sheets

Enter your Email below to Download our Free Cisco Commands Cheat Sheets for Routers, Switches and ASA Firewalls.

We use Elastic Email as our marketing automation service. By submitting this form, you agree that the information you provide will be transferred to Elastic Email for processing in accordance with their Terms of Use and Privacy Policy. Also, you allow me to send you informational and marketing emails from time-to-time.

My Books

This blog has also been the home of my three books which have been embraced by thousands of professionals. They are available in both digital format (PDF) from this website and also as hard-copy books from Amazon so check them out below:

My Books in Digital Format:

ccna lab bookCCNA 200-301 Labs and Guide Book
DOWNLOAD LABS HERE

 

cisco asa firewall fundamentals ebookConfiguration Tutorial For
Cisco ASA 5500 and 5500-X Firewalls

(Covers Newest v9.x)
DOWNLOAD EBOOK HERE

 

cisco vpn configuration guide

VPN Configuration Guide For
Cisco Routers and ASA Firewalls

With FREE ASA 5505 Configuration Tutorial Bonus

DOWNLOAD EBOOK HERE

 

My Books in hard-copy format from Amazon

Cisco ASA Firewall Fundamentals – 3rd Edition

Cisco VPN Configuration Guide

CCNA 200-301 Lab Guide Book with Packet Tracer

Closing Remarks

I’m here to help you as much as possible, that’s why I always try to answer every comment and email that I receive. Don’t hesitate to contact me or leave a comment under my posts on this website and I’ll try to address and answer your questions if I can.

ccna certification ccnp certification ccsp certification

Filed Under: General Networking

Comparison of Fiber Optic vs Copper Ethernet Cables in Networking

fiber and copper ethernet cables

Ever since the explosion in popularity of the Internet back in the late 1990s, networking technology companies have worked tirelessly to improve the infrastructure that supports it. From the earliest token-ring networks to the latest satellite swarm technology like SpaceX’s Starlink, there have been tremendous leaps forward. However, when it comes to Local Area Network […]

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Filed Under: General Networking

Guide to Cisco Bandwidth Command Parameter (With Configuration Example)

network engineers in data center

If you’ve been experimenting with Cisco switches and routers, and searching out their various capabilities, you may have come across an enigmatic feature on the interfaces of these devices.  Specifically, you can adjust an interface’s “bandwidth” parameter to a value of your choice, within a particular range. Now if you’ve tried this strange parameter, you […]

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Filed Under: Cisco General

Understanding IP Prefix Lists in TCP/IP Networks (With Cisco Examples)

prefix list example network

Prefix lists play an important role in networking by providing an efficient and scalable method for managing routing updates in large-scale networks. As a tool for implementing route filtering, they enable network administrators to selectively control the advertisement and acceptance of IP prefixes based on specific criteria. In this article, we’ll delve deeper into what […]

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Filed Under: General Networking

The Purpose of Routing Protocols in TCP/IP Networking

routing protocols purpose

Networks that are based on the TCP/IP protocol stack rely on the Internet Protocol, or IP, to deliver end-to-end connectivity from the sending host to the receiving host.  As such, each node along the path that the packets travel through must have enough information to know how to route the packet to the next hop […]

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Filed Under: General Networking

What is a Wildcard Mask – All About Wildcard Masks Used in Networking

wildcard masks

A wildcard mask is a bitmask used with IPv4 to specify ranges of IP addresses, which are then leveraged by various features, including access control lists and routing protocols.  There’s a lot more to wildcard masks than meets the eye, and they’re a lot more powerful than you may initially think.  In this article, we’ll […]

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Filed Under: Cisco General, General Networking

10 Useful Network Documentation Tools for IT and Networking Professionals

network documentation software tools

As IT and networking professionals, we have critical and difficult jobs. We have to design, deploy, and maintain computer networks and, some of us, manage also the IT devices connected to them. In even a moderately-sized business or data center, that’s an awful lot of work. Just staying on top of all of the hardware […]

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Filed Under: Software

All About the “ip helper-address” Command on Cisco – Configuration and Explanation

ip helper address example diagram

In the world of networking, managing and configuring devices to work efficiently across complex networks is crucial for administrators. One useful and important feature in Cisco networking devices (primarily Layer 3 devices) is the IP Helper Address. The “ip helper-address” Cisco command provides a solution to forward broadcast traffic between Layer 3 network subnets, particularly […]

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Filed Under: Cisco General

Differences Between Routing, Forwarding, Switching in Networks

routing vs forwarding vs switching

Terminology within networking can sometimes get confusing.  Networking has many different terms that can be used in different ways depending on the context and the related technologies being discussed.  Three of the most commonly used terms that can introduce some level of confusion are routing, forwarding, and switching. In this article, we’ll discuss how these […]

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Filed Under: General Networking

What is Asymmetric Routing – Causes and Problems in Networks

asymmetric routing example

Asymmetric routing refers to a situation in which the path taken by data packets between two points in a network is not the same in both directions. In other words, the route that the packets follow from the source to the destination is different from the route they take when traveling back from the destination […]

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Filed Under: General Networking

How to Find IP Address From MAC Address on Cisco Devices

ip from mac address

Troubleshooting a network requires many different investigative skills, tools, and methodologies.  One procedure that is particularly useful when investigating various network problems is being able to determine the IP address of a host on the network when given only its MAC address.  In this article we’ll take a look at how to find an IP […]

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Filed Under: Cisco General

What is Cisco IOS – Overview and Description of Cisco’s Operating System

cisco ios

Cisco’s Internetworking Operating System, or IOS, is a family of network operating systems that is used on several models of the company’s routers and switches.  IOS enables routing, switching, internetworking, and a variety of telecommunications functions on a whole series of Cisco network device platforms. IOS has gone through several phases of evolution, and any […]

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Filed Under: Cisco IOS

What is OSPF NSSA (Not So Stubby Area) and How is it Configured?

nssa areas

In this article we will explain and discuss OSPF Not So Stubby Area (NSSA) and also how to configure this Area type on Cisco routers. OSPF is a link state dynamic routing protocol that is used by routers to share routing information.  This allows routers to inform each other of the paths that should be […]

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Filed Under: General Networking

NetworkLessons Review – Is it the Right Training for CCNA-CCNP-CCIE?

network lessons rene molenaar

What if I told you that there are over 700 practical Cisco networking tutorials waiting for you on a single website that can help you learn hundreds of different Cisco networking topics? The resource I’m talking about above is NetworkLessons.com and is probably one of the few online education portals with so many practical lessons on Cisco […]

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Filed Under: Cisco Certifications

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About Networks Training

We Provide Technical Tutorials and Configuration Examples about TCP/IP Networks with focus on Cisco Products and Technologies. This blog entails my own thoughts and ideas, which may not represent the thoughts of Cisco Systems Inc. This blog is NOT affiliated or endorsed by Cisco Systems Inc. All product names, logos and artwork are copyrights/trademarks of their respective owners.

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