Telecommunications Wireless Communications 2 — Questions and Answers
Question 1: What cellular generation introduced the concept of mobile data in the US?
- 1G
- 2G (Correct answer)
- 3G
- 4G
Correct answer: 2G
2G (GSM/CDMA) introduced digital voice and basic data services like SMS and limited internet access.
Question 2: What frequency range does 5G mmWave technology primarily use in the US?
- 600 MHz – 2.5 GHz
- 3.5 GHz – 6 GHz
- 24 GHz – 40 GHz (Correct answer)
- 60 GHz – 90 GHz
Correct answer: 24 GHz – 40 GHz
5G mmWave (millimeter wave) uses frequencies between 24 GHz and 40 GHz, enabling extremely high speeds but limited range.
Question 3: What is a femtocell used for in wireless networks?
- Connect towers to the backbone
- Extend cellular coverage inside buildings (Correct answer)
- Amplify GPS signals
- Manage SIM card authentication
Correct answer: Extend cellular coverage inside buildings
A femtocell is a small, low-power cellular base station used to extend indoor coverage using the internet as backhaul.
Question 4: What does LTE stand for?
- Long Term Evolution (Correct answer)
- Low Transmission Efficiency
- Licensed Telecom Equipment
- Layered Traffic Engineering
Correct answer: Long Term Evolution
LTE (Long Term Evolution) is the 4G standard for mobile broadband, offering download speeds up to 150 Mbps.
Question 5: Which modulation scheme encodes data by varying signal phase?
- AM
- FM
- PSK (Correct answer)
- PWM
Correct answer: PSK
PSK (Phase-Shift Keying) encodes data by shifting the phase of a carrier signal to represent different bit patterns.
Question 6: What is the purpose of a wireless access point (WAP)?
- Route traffic between VLANs
- Connect wireless devices to a wired network (Correct answer)
- Encrypt VPN tunnels
- Monitor RF spectrum
Correct answer: Connect wireless devices to a wired network
A wireless access point bridges wireless clients to a wired Ethernet network, enabling Wi-Fi connectivity.
Telecommunications Wireless Communications 2
What cellular generation introduced the concept of mobile data in the US?