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Wi-Fi (UGC/ NET)

Description: Wi-fi technology WiFi Gate WiFi questions
Number of Questions: 15
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Tags: Wi-fi technology WiFi Gate WiFi questions Relationships Current Trends and Technologies
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Which of the following is incorrect about Wi-Fi technology?

  1. Wi-Fi stands for wireless fidelity.

  2. Wi-Fi also refers to an IEEE standard 802.11.

  3. DCF (Distributed Coordination Function) and PCF (Point Coordination Function) are two general types of Wi-Fi transmission.

  4. Wi-Fi uses infrared to transmit and receive data at high speed.

  5. Wi-Fi offers higher peak data rates than do 3G systems.

Show answer
Correct Option: D
Explanation:

This is a wrong statement about Wi-Fi since Wi-Fi uses radio technologies to transmit and receive data at high speed.

Which of the following services comes under Distribution System Services (DSS) specified by IEEE 802.11?

  1. Authentication

  2. Deauthentication

  3. MSDU Delivery

  4. Integration

  5. Privacy

Show answer
Correct Option: D
Explanation:

Integration came under Distribution Station Services (DSS). Integration service handles delivery of MSDUs between the distribution system and a wired LAN on the other side of a portal.

In the given options, which of the following is not related to Wi-Fi security?

  1. Service Set Identifier (SSID).

  2. Wired Equivalent Privacy (WEP).

  3. IEEE 802.11e

  4. Wireless Protected Access (WPA).

  5. IEEE 802.11i

Show answer
Correct Option: C
Explanation:

IEEE 802.11e defines a set of Quality of Service enhancements that are of critical importance to applications that cannot tolerate delays, such as streaming multimedia or voice over IP. Hence, it is not related to Wi-Fi security.

A set of Basic service set [BSS] forming a virtual BSS is called

  1. station

  2. distribution system

  3. extended service set

  4. access point

  5. basic service set

Show answer
Correct Option: C
Explanation:

A set of Basic service set [BSS] forming a virtual BSS is called Extended service set [ESS].

For secure Wi-Fi connection, a user needs a WEP key. What is the full form of WEP?

  1. Wireless Ethernet Protocol

  2. Wired Equipment Privacy

  3. Wireless Equipment Privacy

  4. Wired Equipment Protocol

  5. Wide Equipment Protocol

Show answer
Correct Option: B
Explanation:

Wired Equipment Privacy is the correct full form of WEP.

An IEEE 802.11 standard, which is a physical layer standard that works in unlicensed 5-GHz radio band using Orthogonal Frequency Division Multiplexing is known as:

  1. IEEE 802.11c.

  2. IEEE 802.11a.

  3. IEEE 802.11f.

  4. IEEE 802.11h.

  5. IEEE 802.11d.

Show answer
Correct Option: B
Explanation:

IEEE 802.11a is a physical layer standard that works in unlicensed 5-GHz radio band using Orthogonal Frequency Division Multiplexing.

Which of the following statement is incorrect about an IEEE standard 802.11n?

  1. An IEEE standard 802.11n was standardized in 2009.

  2. An IEEE standard 802.11n extends 802.11b and .11g standard.

  3. An IEEE standard 802.11n uses 5.725 GHz frequency bands.

  4. An IEEE standard 802.11n uses MIMO (Multiple Input Multiple Output) by having multiple antennae at both sender and receiver.

  5. Expected total multi-station throughput of an IEEE standard 802.11n is 600 Mbps.

Show answer
Correct Option: C
Explanation:

It is incorrect statement about an IEEE standard 802.11n since it uses the 2.4 GHz and 5 GHz frequency bands.

Which of the following 802.11 standard specification adds support for data exchange between high-speed vehicles and between vehicles and roadside infrastructure?

  1. 802.11g.

  2. 802.11a.

  3. 802.11i.

  4. 802.11p.

  5. 802.11e.

Show answer
Correct Option: D
Explanation:

802.11p adds support for data exchange between high-speed vehicles and between vehicles and roadside infrastructure.

Which of the following statements is incorrect about the Wi-Fi IEEE standard 802.11a?

  1. The Wi-Fi standard IEEE 802.11a is introduced in 1999.

  2. The Wi-Fi standard IEEE 802.11a operates at 5GHz.

  3. The theoretical speed and actual speed of Wi-Fi standard IEEE 802.11a are 54 Mbps and 15-20 Mbps.

  4. The Wi-Fi standard IEEE 802.11a is least expensive than IEEE 802.11b.

  5. 50-75 is the feet range of the Wi-Fi standard IEEE 802.11a.

Show answer
Correct Option: D
Explanation:

It is incorrect statement. The Wi-Fi IEEE standard 802.11a is more expensive than all other standards.

A Wi-Fi device which connects a wired network to a wireless network is called:

  1. Wireless routers

  2. Wireless ethernet bridge

  3. Wireless access point (WAP)

  4. Wireless range extender

  5. Channel

Show answer
Correct Option: B
Explanation:

A wireless ethernet bridge connects a wired network to a wireless network.

Which of the following are Supported Data Rates by the Wi-Fi IEEE standard 802.11b?

  1. 1, 2, 5.5, 11 Mbps.

  2. 6, 9, 12, 18, 24, 36, 48, 54 Mbps.

  3. 1, 2 Mbps.

  4. 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54, 121.5, 130, 144.44, 270, 300 Mbps.

  5. 1, 2, 5.5, 11, 6, 9, 12, 18, 22, 24, 33, 36, 48, 54 Mbps.

Show answer
Correct Option: A
Explanation:

1, 2, 5.5, 11 Mbps are Supported Data Rates by the Wi-Fi IEEE standard 802.11b.

Which of the following is not a main component of 802.11 frames?

  1. Preamble

  2. PLCP header

  3. MAC data

  4. Protocol version

  5. CRC

Show answer
Correct Option: D
Explanation:

Protocol version is not main component of 802.11 frame rather it is a subfield of MAC data component.

Which of the following statement is incorrect about Infrastructure mode of Wi-Fi?

  1. In Infrastructure mode, all packets go through a base station.

  2. In Infrastructure mode, devices are capable for communicating directly with each other.

  3. In Infrastructure mode, an ESS is identified with an ESSID (Extended Service Set Identifier), a 32-character identifier (in ASCII format) which acts as its name on the network.

  4. In Infrastructure mode, each BSS is identified by a BSSID, a 6-byte (48-bite) identifier.

  5. In Infrastructure mode, Wireless Access Points are usually routers or switches which are connected to the internet by Ethernet port.

Show answer
Correct Option: B
Explanation:

It is an incorrect statement. Since In Infrastructure mode, devices are connected to wireless network with the help of Access point (AP). In Ad-hoc mode, devices are capable for communicating directly with each other.

Which of the following is approximate outdoor range of IEEE standard 802.11n?

  1. 70 metres and 230 feet

  2. 140 metres and 460 feet

  3. 38 metres and 125 feet

  4. 250 metres and 820 feet

  5. 120 metres and 390 feet

Show answer
Correct Option: D
Explanation:

This is approximate outdoor range of IEEE standard 802.11n.

What is another name of IEEE standard 802.16x?

  1. Wi-Fi

  2. Wimax

  3. GSM

  4. Bluetooth

  5. Wi-Fi5

Show answer
Correct Option: B
Explanation:

IEEE standard 802.16x is also known as Wimax.

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