Network+Exam+Questions

=== The Technological Research University has decided to put a //WLAN// in its campus. They already have a LAN in the place and it connects all the staff computer. The main aim of the //WLAN// is to provide teachers and students with access to the university platform, where contents of all their subjects is placed. ===

A WLAN is a local area network that uses no physical wires. Sometimes a WLAN communicates with a wired LAN for access to its resources.
 * __Define the term //WLAN//__

Teachers can share information with their pupils via Internet, download useful information from different users and use the resources of the network such as hardware (printer) and software (different applications or programs).
 * __Describe **two** possible advantages for teachers when having access to a network.__

They could protect their network with a WEP address that needs an specific password to be accessed. If the user does not know the password, then it will not have access to the network. Also the school could use a hidden SSID so only the school's staff can enter and the WLAN doesn't appear when any computer scans for available networks thus making sure that only allowed people have access to it.
 * __Explain how does the school can be sure that only students and teachers connect to the WLAN__


 * A primary school just created a computer lab inside their facilities to teach children basic computer knowlegde and the use of the Internet. After consulting with many experts, the director decided to install a wired connection to connect all the computers instead of a wireless network. They were also told to buy a firewall to control Internet traffic within their network. **


 * __Identify at least four components or devices that the wired network should have.__

Desktop computers (most common in primary schools), Printer, The firewall system along with the internet acces and a scaner.


 * __Describe **three** advantages of using wired Internet connections instead of a wireless connection.__

First, wired connections are faster. As they don't rely on air signals like a wireless connection,that could be easily interrupted by many external factors such as walls they work faster, because it hard to interrupt a physical connectior, or if interrupted you can easily notice it and fix the problem faster than what a wireless connection will take

Second, they are harder to crack. As they depend on physical wires, it would be very hard for an unwanted person to have access to it becaus ein order to do so that person would have to physically get the cable and connect it to his/her computer, not as in wireless connection, that with a click in about 10min. you can crack a network.

Third, wired connections are relatively cheaper. Consider that the price here in Mexico for 1m of Ethernet cable is from 30-50 pesos and the price for a very cheap wireless anthenna is around 300$, and even if we consider the different currencies arround the world and the nowadays economic crisis it is still a lot cheaper to produce metres and metres of an 8-copper-cable-wire that to produce that same amount of wireless anthennas. Also the prices given by an ISP for a wired connection are lower than the prices for the usage of a wireless one.

Fourth, they are to a certain extent easier to mantain. With wireless connections, even though they seem to not need anything but a wireless anthenna they are trickier to mantain because if there is a problem with the connection you cannot notice it as easy as you could with a wired one, this mainly because in a wired connection there are a lot of factors that could affect your connection that you may not be able to solve quite fast such as wind, thick walls, other wireless connections interfering, a problem with the ISP, a problem with your anthenna among others. In a wired connection you don't have that many factors and if a problem occurs it could be a lot easier to solve. Also even though it looks like a lot of work to give regular maintennance to a wired connection, it is actually easier anf more effective that to give regular maintennance to a WLAN.


 * __Explain why is it useful to have a firewall installed in the network of the school.__

Aschool is one of the sites where information needs to be filter the most, due to the fact that underage childs could be exposed to ethical or dangerous information from the websites. In order for being able to filter the internet accesibility, the administrator needs to introduce a firewall into the network, which by a set of comands, would allow the administrator to block certain subject/key phrases or tools in order to prevent the unautorised users from downloading prhibited information.

One of th flaws with firewalls is that they can be outsmarted by simple steps, such as using proxis, which hide the web page name into another format/code, or installing an special browser which would allow you to maintain anonimity such as the "Tor browser", or as we do... by typing https on the we searcher in order to enter the outer security comands.