14 tutorials Networking

networkingA network in IT is a group of two or more computers linked together. There are many types of networks but the most common ones are the LAN ( Local Area Network ) and WAN ( Wide Area Network ) . Computer networks are built using cables, switches, routers, firewalls, servers, etc. Computers that facilitate resources ( files, databases,  applications, etc. ) on the network are called servers and the devices connected to the network are either called nodes or clients.

What does a network administrator/engineer do?

A network professional design, build, and provide ongoing support to a computer network. he also establishes operation policies and procedures related to the network.

What do you need to build a network?

To build a very basic network, you only need a switch to connect two or more computers together. Most computer networks are more advanced than that, and use multiple switches, a router, multiple servers, and a firewall.

What are the network essentials every network professional must know?

Networking covers a huge range of technologies in hardware and software. At the very minimum, a network professional needs to have an understanding of the physical layer of a network, that includes network topologies, cabling, be able to understand, install and configure a switch, a router, and a firewall etc. He needs to have a basic understanding of network protocols like ICMP, TCP, IP, NTP, Telnet,BGP, etc. He need to able to install, configure and troubleshoot network components like Active Directory, DNS, and DHCP servers, etc.

How can you get started in the networking field?

My suggestion would be that you learn as much as you can about all the networking components I mentioned above. buy a switch and try to link computers together, and as you progress in your learning setup a server with active directory and try to join those computers to a domain. networking is a craft, the more you do it the better you get at it so try to get your hands dirty as much as possible.

In this page, and basically all over this site you will find many step-by-step tutorials that can help you get started installing many things you need in a network. If you can’t find what you are looking for, don’t be shy to ask.


The difference between bandwidth and latency is something that confuses a lot of people, but if you are an IT professional it would be useful to know the difference between the two because sooner or later you will face a network problem related to it. Part of the confusion has been created by Internet providers by always recommending increase of bandwidth to every Internet speed related problem, but as we will see, an Internet connection speed is not always dictated by bandwidth. What is Bandwidth? To understand bandwidth and latency we need to have a clear definition of both, so…

Email spoofing is a big security issue in IT. Often email users get fake emails pretending to be from colleagues or from their boss, and many of them fall for it sometimes leaking sensitive information to spammers. What is email spoofing? Email spoofing is the process of forging an email address to make it look like is sent from a known email address. Basically in a spoofed email the from: field is modified to make it look like the email is coming from a person the recipient know.The result is that the email recipient sees the email as having come…

The organization where I work recently moved to a new office space in a more crowded location and our users started complaining about wifi connectivity issues a lot. Their connection would become unresponsive at times, with ocasional timeouts. We didn’t change anything in our WIFI setup from our previous office, and we didn’t have that problem in our old place, so this was new to us. our wifi setup consist of 3 Linksys WT 1900 routers spread out strategically around the office. Diagnosing the problem Because nothing had changed in our wifi setup from our previous office, and our new…

This post idea came up from an IT support request I got from a user trying to get to our company website today. she was typing just the the domain name without using the www prefix on the browser, and she was getting to our domain controller web server instead of the public site, and she was wondering why. she was even worried that our website was hacked! Our problem is that our website URL and our network domain name is the same. our website is hosted outside the network, so people in order to get to the site they…

If you suspect someone is connected to your Wireless access point and is leeching your Internet connection, then there are some simple check ups you can do to see if someone is indeed using your wireless router. let me explain. In order for someone to use your wireless Internet connection he needs to obtain an IP address from your router, and the router keeps a record of all the IP addresses of computers currently connected in the DHCP table. so, if someone is indeed connected to your wireless router, then it should show in the DHCP table. to check the…

If you use Windows VPN to connect to your work network, then you might already have noticed that while connected to VPN the computer uses the VPN connection to connect to the Internet by default. for example, we block YouTube at work, and when I connect to VPN from home, and try to go to YouTube from my home computer, I get the Firewall content filtering message on my browser from the firewall at work: Correcting this problem is easy. from Windows 7, click on the Start button and type “ncpa.cpl” on the search field. the network connections window will…

If you are connecting to a Windows Server 2008 or  Windows 7 computer through remote desktop you might get this error: “The remote computer requires Network Level Authentication, which your computer does not support” here is a screenshot of the actual fat error: the reason you are getting this error is because you are either using Windows XP, or another older operating system to connect to the remote machine, and Windows XP or any other operating system older than windows vista  does not support the new updated remote desktop protocol. if you have access to the remote machine running Windows…

As a computer technician sometimes you need to guide customers on the phone on how to make certain adjustments on their home wireless routers. for your own convenient, sometimes it helps to have a model of the same router the customer is using so you can tell them exactly what to do. the problem is that it is really unrealistic to have a bunch of routers just for the purpose of guiding your customers, but now thanks to this cool website you can. Skyangel lists router emulators for most common wireless routers. Linksys, Netgear, D-Link, Belkin, etc. Emulators look just…

is amazing how many people visit this site looking for a way to network their home computers. I have written a few articles about home networking in the past, and because most of home networks consist of two computers, I will talk about that setup on this post. common reasons to network two or more computers in a home network are; sharing music with family members or friends, sharing a  printer with everyone on the network, saving files on a centralized location, etc. Home Internet providers give you a modem for your Internet connection when you sign up with them.…

Recently I switched my Internet provider from Comcast to Verizon DSL, and one of the first things I did on the router was to change the default wireless DHCP IP subnet. the reason I did that was because I cannot connect to our company VPN using the default 192.168.1.x subnet in the Verizon DSL modem. this is one of the reason we phased out VPN from our company by the way, because the 192.168.1.x IP subnet is the most used in home routers, and since we switched the subnet mask to 255.255.254.0 on the network at work because we were…



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