IT and Technology Wireless & Mobile Technologies 1 — Questions and Answers
Question 1: Which IEEE 802.11 standard is officially branded as Wi-Fi 6 by the Wi-Fi Alliance?
- 802.11n
- 802.11ac
- 802.11ax (Correct answer)
- 802.11ad
Correct answer: 802.11ax
IEEE 802.11ax was branded Wi-Fi 6 by the Wi-Fi Alliance, introducing OFDMA and improved efficiency over 802.11ac (Wi-Fi 5).
Question 2: What frequency band does Bluetooth Low Energy (BLE) operate on?
- 900 MHz
- 2.4 GHz (Correct answer)
- 5 GHz
- 60 GHz
Correct answer: 2.4 GHz
BLE operates in the 2.4 GHz ISM band using 40 channels of 2 MHz each, sharing the band with classic Bluetooth and Wi-Fi.
Question 3: What does SSID stand for in wireless networking?
- Secure Signal Identifier
- Service Set Identifier (Correct answer)
- System Security ID
- Subnet Segment Identifier
Correct answer: Service Set Identifier
SSID (Service Set Identifier) is the human-readable name that identifies a specific wireless network to clients scanning for access points.
Question 4: Which wireless security protocol uses TKIP encryption and was designed as a transitional replacement for WEP?
- WPA (Correct answer)
- WPA2
- WPA3
- 802.1X
Correct answer: WPA
WPA (Wi-Fi Protected Access) succeeded WEP using TKIP encryption but has since been superseded by WPA2 and WPA3 due to TKIP vulnerabilities.
Question 5: What does MIMO technology provide in wireless networking?
- End-to-end encryption of wireless data
- Reduced wireless interference through frequency separation
- Increased throughput by using multiple antennas simultaneously (Correct answer)
- Client authentication via digital certificates
Correct answer: Increased throughput by using multiple antennas simultaneously
MIMO (Multiple Input Multiple Output) uses multiple antennas to transmit and receive several data streams at once, significantly increasing wireless throughput.
Question 6: Which generation of cellular networks first introduced mobile broadband Internet access for smartphones?
- 2G (GSM)
- 3G (UMTS/HSPA) (Correct answer)
- 4G (LTE)
- 5G (NR)
Correct answer: 3G (UMTS/HSPA)
3G networks introduced mobile broadband, enabling smartphones to access the internet with speeds suitable for web browsing, email, and streaming.
Question 7: Which IEEE 802.11 standard, also known as WiGig, operates in the 60 GHz band to achieve multi-gigabit speeds over very short distances?
- 802.11ac
- 802.11ad (Correct answer)
- 802.11ax
- 802.11n
Correct answer: 802.11ad
IEEE 802.11ad (WiGig) operates at 60 GHz, delivering throughput up to 7 Gbps but with extremely limited range due to poor wall penetration at that frequency.
IT and Technology Wireless & Mobile Technologies 1
Which IEEE 802.11 standard is officially branded as Wi-Fi 6 by the Wi-Fi Alliance?