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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 10 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 10,000 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 Cisco Commands Cheat Sheets

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

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 two 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:

cisco asa firewall fundamentals ebook

Configuration 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

Closing Remarks

I’m here to help you as much as possible, that’s why I 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 certificationccnp certificationccsp certification

Filed Under: Miscellaneous

10 Best Network Engineer Certifications to Pursue in 2020 and Beyond

top certs for network engineers

Like all other areas in the field of Information Technology, networking is growing fast, and there’s a necessity for qualified professionals with the knowledge necessary to keep networks up and running, secure, and reliable. But even in the world of networking, there are a plethora of specializations an individual can take. One can choose to […]

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Filed Under: CCNA Exam Preparation, CCNA Training, CCNP Exam Preparation, CompTIA Training, I.T Training, Technology Certifications, Top Certifications

Basic Cisco Switch Configuration

cisco switches

In my opinion, the Cisco switches are the best in the market. Versatile, reliable, flexible and powerful, the Cisco switch product line (such as the 2960, 3560, 3650, 3850, 4500, 6500, 9400 series etc) offer unparalleled performance and features. Although a Cisco switch is a much simpler network device compared with other devices (such as […]

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Filed Under: Cisco Switches Tagged With: cisco switch configuration guide, step by step switch configuration

10 Best Network Troubleshooting Software Tools (Free&Paid)

network engineer tools

As a network engineer, you will be spending almost half of your time in troubleshooting issues arising in the network or solving problems related to IT and network conditions. Although there are several Windows or Linux commands that you can use on host computers to check for various connectivity issues, a professional should have a […]

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Filed Under: General Networking, Software

10 Best IT & Network Inventory Software Tools (Free & Paid)

administrator managing servers

Companies these days need to deal with and manage vast inventories of network and IT assets. Keeping track of these assets, tagging them, and knowing their status at all times is essential to the operations of any modern company. Image Source As you’d expect, this is a big job but network inventory software makes it […]

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Filed Under: Software

DNS Port Number – What is Domain Name System – How DNS Works

guide about domain name system

DNS (Domain Name System) is the system that translates an Internet or Host name (that is easier for people to remember) to an IP address. In this article we’ll describe how DNS works, what port numbers are used for DNS protocol etc so keep reading for all info below.

Table Of Contents

What is DNS A Domain […]

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Filed Under: General Networking Tagged With: dns, domain name system

How to Configure Static Routing on Cisco IOS Routers (Examples)

Cisco IOS Routers support both static and dynamic routes. In small networks (2 to 5 routers) I would suggest to configure only static routes, especially if the network is not going to change much over time. Of course dynamic routing (using dynamic routing protocols such as RIP, OSPF, EIGRP) is much more flexible and scalable […]

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Filed Under: Cisco Routers, General Networking

Redistribution Between Cisco EIGRP into OSPF and Vice Versa (Example)

cisco ospf eigrp redistribution

The most common scenario for big enterprise networks with multiple routers is to have a single IGP routing protocol (IGP = Interior Gateway Protocol) running between the routers in order to distribute all the routing information of the network. The most common IGP routing protocols used by today’s networks are OSPF, EIGRP (Cisco proprietary) and […]

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Filed Under: Cisco Routers Tagged With: cisco redistribution, eigrp ospf redistribution

Configuring Local Username and Password on a Cisco IOS Router

how to configure credentials on cisco router

There are mainly two ways to authenticate to a Cisco router device (and also to other networking devices in general). Using an external authentication service (such as AAA server, Radius, TACACS etc) or by having local usernames and passwords on the device itself. In this article we will discuss how to setup a local username […]

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Filed Under: Cisco Routers

How to Configure EIGRP on Cisco Routers (With Example)

Enhanced Interior Gateway Routing Protocol (EIGRP) is an enhanced version of the now obsolete IGRP. EIGRP is Cisco proprietary which means it is available only on Cisco routers and switches. EIGRP employs an algorithm referred to as the Diffusing Update Algorithm (DUAL) which guarantees fast convergence and loop-free operation at all times. It is an […]

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Filed Under: Cisco IOS

Password Recovery for the Cisco ASA 5500 Firewall (5505,5510,5520 etc)

password recovery on cisco asa

If you have lost the administrator password to access the security appliance you can recover the ASA password with the following steps: Recovering your Password on Cisco ASA Step1: Connect to the firewall using a console cable Step2: Power cycle the appliance (power off and then on) Step3: Press the Escape key to enter ROMMON […]

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Filed Under: Cisco ASA General Tagged With: asa password recovery, how to recover lost password on cisco asa 5500, password recovery

Cisco Spanning Tree Protocol Guide (STP Examples and Configuration)

guide on cisco stp

Spanning Tree Protocol (STP) ensures a loop-free topology in a local area network (LAN) made up of switches. It is desirable to have redundant links in a switched LAN so that a single link failure cannot interrupt normal operation of the network. But redundant links may also introduce physical switching loops that are undesirable. STP […]

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Filed Under: Cisco Switches

Basic Cisco Router Configuration Step-By-Step Commands

step by step configuration tutorial for Cisco routers

This post is by no means an exhaustive tutorial about Cisco Routers and how to configure their numerous features. It is a step-by-step guide for the most basic configuration commands needed to make the router operational. When you first power up a new Cisco Router, you have the option of using the “setup” utility which […]

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Filed Under: Cisco Routers Tagged With: basic cisco router configuration, cisco router, cisco router configuration

What is a Subnet Mask Used For (on Routers and Hosts)

explanation of subnet masks

This is a post for people new to networking that have just started learning IP addressing and the basis of routing and subnetting. Every host or device on a TCP/IP network MUST have an IP address assigned in order to communicate with other devices. An IP address consists of a network part and a host […]

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Filed Under: General Networking Tagged With: subnet mask, subnetmask

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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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