Computer Networks Questions & Answers – Wireless LAN
This set of Computer Networks Multiple Choice Questions & Answers (MCQs) focuses on “Wireless LAN”.
1. In wireless network an extended service set is a set of ________
a) connected basic service sets
b) all stations
c) all access points
d) connected access points
Explanation: The extended service set is a feature of the IEEE 802.11 WLAN design that allows several basic service sets to be connected to extend the range of the basic service set.
2. Mostly ________ is used in wireless LAN.
a) time division multiplexing
b) orthogonal frequency division multiplexing
c) space division multiplexing
d) channel division multiplexing
Explanation: Digital data is encoded on several carrier frequencies in orthogonal frequency division multiplexing. In addition to Wireless LANs, it is employed in digital television and audio transmission.
3. Which one of the following event is not possible in wireless LAN?
a) collision detection
b) acknowledgement of data frames
c) multi-mode data transmission
d) connection to wired networks
Explanation: In a wireless LAN with no extensions, collision detection is not possible. Collision detection algorithms for multiple access, such as CSMA/CD, are used in Wireless LANs to detect collisions.
4. What is Wired Equivalent Privacy (WEP)?
a) security algorithm for ethernet
b) security algorithm for wireless networks
c) security algorithm for usb communication
d) security algorithm for emails
Explanation: WEP is a wireless network security method that aims to ensure data secrecy equivalent to that of traditional wired networks. It first appeared in 1997.
5. What is WPA?
a) wi-fi protected access
b) wired protected access
c) wired process access
d) wi-fi process access
Explanation: WPA, or WiFi Protected Access, is a security system that gives users and businesses confidence that only authorised users can access their wireless networks (WiFi).
6. What is the access point (AP) in a wireless LAN?
a) device that allows wireless devices to connect to a wired network
b) wireless devices itself
c) both device that allows wireless devices to connect to a wired network and wireless devices itself
d) all the nodes in the network
Explanation: In a wireless network, an access point is any device that connects wireless devices to a wired network. The finest example of an Access Point is a router.
7. In wireless ad-hoc network _________
a) access point is not required
b) access point is must
c) nodes are not required
d) all nodes are access points
Explanation: A decentralised wireless network is an ad-hoc wireless network. It would be against the rules of the ad-hoc network to employ an access point because it is usually a central device. As a result, it is not required.
8. Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?
Explanation: Carrier-sense multiple access/collision avoidance is abbreviated as CSMA/CA. It is a multiple access protocol for wireless LAN that is part of the IEEE 802.11 standard. It works on the collision avoidance principle, employing various algorithms to avoid channel collisions.
9. In wireless distribution system __________
a) multiple access point are inter-connected with each other
b) there is no access point
c) only one access point exists
d) access points are not required
Explanation: Multiple access points can be linked together using a Wireless Distribution System. It’s used to connect two wireless networks together.
10. A wireless network interface controller can work in _______
a) infrastructure mode
b) ad-hoc mode
c) both infrastructure mode and ad-hoc mode
d) WDS mode
Explanation: A wireless network interface controller works on the OSI model’s physical and data link layers. WNIC in infrastructure mode requires an access point, although it is not necessary in ad-hoc mode.
A wireless LAN (WLAN) is a wireless computer network that connects two or more devices using wireless communication to form a local area network (LAN) inside a certain region, such as a home, school, computer lab, campus, or office building. This allows users to travel throughout the region while remaining connected to the network. A WLAN can also enable access to the rest of the Internet via a gateway. Most current WLANs are marketed under the Wi-Fi brand name and are based on IEEE 802.11 standards. Wireless LANs are popular in the home because they are simple to set up and utilise.