Interview questions on wireless network for freshers/beginners

1.define network?

A network is a large and widely distributed group of people or things such as stores, colleges, or churches that communicate with one another and work together as a unit or system.

2.What is LAN, MAN, WAN, AND PAN? Give one example to each?

LAN:-Lan is local area netwrok.

e.g->wi-fi network.
1.Open area wi_fi(range->100-200m). 2.closed area wi-fi(range->50-100m).
MAN: -MAN stands for metropolitan area network.

E.g.->wi-max(range->50kms).

WAN: -WAN means wide area network.
E.g->parabolic dish or satellites.
PAN: -PAN stands for personal area network.

e.g.->Infrared(range-900nm ,bluetooth (range->100m).

3.Difference between wireless network and wired network?

The differences between wireless and wired network are as follows:-

flexiblity: -We can use wireless networking within a range from any position but in wired network we have a limit to use it at a desired position.

Cost: -wireless is cheaper than wired network as in wired network the cost of cabling is included.

Robust: -wireless network is secure as it can survive in disaster attacks while wired networks not.To set up wired network again cabling, installation, and configuration is needed.
Planning: -no previous planning is required in wirelss network while wired network wiring needs an action plan.

4.What are the disadvantages of wireless network?

The quality of service: -service quality of wireless network network is poor in comparison with wired network due to lower bandwidth.

Restrictions: -All wireless products have to comply with national regulations.several govt. And non.govt. Institutes worldwide regulate the operation and restrict frequencies to minimize interference.

Safety: -wireless network use radio waves for data transmission which might interfere with high-equipments during transmission.so, in hospitals and other safety places use of wireless network is restricted to safety measures.

5.what is radio interface?
The ability of signals to tranmit and receive is known as radio interface.Here, the one who tranmit is known as “sender and one who receives is referred to as “receiver”.
6.Define IEEE?
IEEE-SA stands for the institute of electrical and electronics engineering is an association that is dedicated to advancing technology innovation and excellence.Its headquarter is situated in new york.
7.what is IEEE standard code for wireless network?
802.11.
8.Range and throughput of 802.11b802.11a and 802.11g?
802.11b->11 Mbit/s and 100 to 150 feet range. 802.11a->54Mbit/s and 25 to 75 feet range. 802.11g->54Mbit/s and 100-150 feet range.
9.what is wifi ?
Wi-Fi stands for wireless fedility is a device which allows electronic devices to exchange data through radio transmission.
10.What are the protocols used in wi-fi for security?
WEP: -Wireless encryption protocol.

WPA: -wireless protocol access.
11.Difference beween WEP and WPA?

WPA is more scure than WEP as WPA provides better encryption than WEP.

WPA ofers more security through authentication of user which is missing in WEP.

12.tech used for transmission in wireless network?

13.Define radio waves ?
Radio waves are invisible form electromagnetic radiation having frequency range from 300GHZ to 3KHZ.It is used for data tranmission in various wireless technology as their range is more and have the ability to pass through walls and other matreiials.
14.How do you secure a wireless network?
Forbid SSID broadcasting, enable MAC-level access where appropriate, enable WEP, enable 802.11i where available, enable firewalls, enable WPA.
15.Define.Infrared waves?
Infrared rays are electromagnetic waves with wavelength in between visible light and radio waves.It is also used for data transmission for lower range.Such as in PAN For exchanging data throgh infrared technology available in various mobiles.