WiFi MCQ. Wireless communication Questions and answers PDF for computer competitive exam and interview (CISCO, GATE, COPA, CCC etc.) preparation. These Wi-Fi related question belongs to Networking chapter of computer science. “Wi-Fi” ( A wireless communication device)
WiFi MCQ
1. A wireless network uses ___ waves to transmit signals.
a) mechanical
b) radio
c) sound
d) None of these
Ans. b
2. What device sends and receives radio signals in a wireless network?
a) modem
b) digital translator
c) router
d) All of these
Ans. c
3. ______ of the following networking standards, which is not used in Wi-Fi data transmisstions?
a) 802.11g
b) 802.11q
c) 802.11b
d) None of these
Ans. b
4. Which networking standard is the slowest and least expensive?
a) 802.11a
b) 802.11b
c) 802.11n
d) All of these
Ans. b
5. Which networking standard was the first to use orthogonal frequency division multiplexing (OFDM) as a coding technique?
a) 802.11g
b) 802.11a
c) 802.11n
d) None of these
Ans. b
6. Which short range wireless standard is used for Wireless Personal Area Networks (WPANs)?
a) 802.16
b) 802.15
c) 802.13
d) None of these
Ans. b
7. You can change the settings on your wireless router through a Web interface. One option you can change is channel. What channel do routers use by default?
a) 2
b) 7
c) 6
d) None of these
Ans. c
8. Which Operates in the 2.4GHz Industrial, Scientific and Measurement (ISM) band (2.4 GHz to 2.4835 GHz) and provides signaling rates of up to 11 Mbit/sec.
a) 802.11a
b) 802.11b
c) 802.11e
d) 802.11g
Ans. b
9. Which Wi-Fi security is impossible to crack?
a) WEP
b) WPA
c) MAC Filtering
d) None of these
Ans. d
10. What should you do to keep unauthorized users from changing your home router settings?
a) Change the firewall settings on your computer
b) Change the default administrator password and SSID
c) Change the MAC address of the router
d) Nothing, only the administrator can change router settings
Ans. b
11. What are two components necessary to have a wireless network?
a) A laptop and the internet
b) An access point and a WNIC
c) A router and an internet connection
d) A dual layer DVD reader and a LAN
Ans. b
12. What channel is the default for commercially sold routers?
a) Channel 5
b) Channel 6
c) Channel 7
d) Channel 2
Ans. b
13. Why is WEP security not as strong as WPA or WPA2 even though the code key is longer?
a) WPA uses tunneling protocols
b) WEP sends authentication codes with each packet
c) WEP lacks the ability to use special character
d) WEP is not compatible with Windows7 or MAC OS
Ans. b
14. Which wireless protocol uses TKIP?
a) WEP
b) WPA
c) WPA2
d) WPS
Ans. b
15. A Wi-Fi enabled device can be ______
a) PC
b) Game Console
c) Mobile phone
d) All of these
Ans. d
16. Wi-Fi uses which kind of multiplexing?
a) OFDM
b) TDM
c) WDM
d) FDM
Ans. a
17. Wifi Alliance for Certified products based on the
a) IEEE 802.3
b) IEEE 802.5
c) IEEE 802.11
d) None of these
Ans. c
18.Does wifi support roaming?
a) Yes
b) No
Ans. a
19. What is the “acceptable” limit for the attenuation of a wifi signal (threshold before breaking signal)
a) 75 dB
b) 20 db
c) -75 DB
d) -75 GHz
Ans. c
20. 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
Ans. a
21. Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?
a) CDMA
b) CSMA/CA
c) ALOHA
d) CSMA/CD
Ans. b
22. A wireless LAN is often an extension of the ____ of a wired network
a) Hub
b) Edge
c) Distribution
d) Core
Ans. b
23. Which aspect of Wireless LAN security guards against eavesdropping of wireless LAN traffic?
a) Accounting
b) Authorization
c) Authentication
d) Encryption
Ans. d
24. A wireless access point is generally considered to be a layer _____ device.
a) 4
b) 1
c) 2
d) 3
Ans. c
25. Which organization performs inter-operability tests of WiFi devices?
a) WLAN Professionals
b) IEEE
c) Wi-Fi Alliance
d) IANA
Ans. c
26. The Wi-Fi brand was created by which organization?
a) Wi-Fi Alliance
b) IEEE
c) ISO
d) Cisco
Ans. a
27. Which Wireless LAN network component is responsible for centralized control & management of a WLAN?
a) A network switch
b) An access point
c) A wireless LAN controller
d) A wireless client
Ans. c
28. A WLAN access point converts between 802.___ and 802.____ frames.
a) 802.11ac, 802.11n
b) 802.11, 802.3
c) 802.11i, 802.3
d) 802.1, 802.3
Ans. b
29. The infrastructure components of a wireless network are generally interconnected by:
a) Clients
b) RF links
c) Switches
d) All of these
Ans. c
30. Which IEEE standard do Wireless LAN networks conform to?
a) 802.13
b) 802.3
c) 802.11
d) 802.1
Ans. c
31. IEEE 802.11 defines the basic service set as the building block of a wireless
a) LAN
b) WAN protocol
c) MAN
d) All of these
Ans. a
32. In wireless LAN, there are many hidden stations so we cannot detect the
a) Frames
b) Collision
c) Signal
d) Data
Ans. b
33. A set that makes stationary or mobile wireless station and also have optional central base station is known as
a) Basic service set
b) Extended service set
c) Network point set
d) Access point
Ans. a
34. The wireless transmission is divided into
a) 3 broad group
b) 6 broad group
c) 9 broad group
d) 8 broad group
Ans. a
35. The WiFi standard which permits transmission distance of 50m with data rate of 54MBPS is ______ .
(a) IEEE 802.11a
(b) IEEE 802.11b
(c) IEEE 802.11g
(d) IEEE 802.11n
Ans. a
36. The WiFi standard which permits transmission distance of 100m with data rate of 11MBPS is ______.
(a) IEEE 802.11a
(b) IEEE 802.11b
(c) IEEE 802.11g
(d) IEEE 802.11n
Ans. b
37. The WiFi standard which permits transmission distance of 100m with data rateof 54MBPS is ______.
(a) IEEE 802.11a
(b) IEEE 802.11b
(c) IEEE 802.11g
(d) IEEE 802.11n
Ans. c
38. The WiFi standard which permits transmission distance of more than 100m with data rate of 100MBPS is ______ .
(a) IEEE 802.11a
(b) IEEE 802.11b
(c) IEEE 802.11g
(d) IEEE 802.11n
Ans. d
39. Normally, WiFi signal reach ______ mdistance.
(a) 50 to 100m
(b) 1 to 2m
(c) 0.5 to 1.0m
(d) 2 to 3m
Ans. a
40. Name of a WiFi network may be ______ .
(a) visible
(b) invisible
(c) both a & b
(d) none of them
Ans. c