What can an impedance mismatch in the RF cables and connectors cause?

1. A. Fewer MCS values in the MCS table
2. B. Excessive VSWR
3. C. Increased amplitude of the RF signal
4. D. Increased range of the RF signal

Correct Answer: B
Reference https://books.google.com.pk/books?id=uA68E68OqQgC&pg=PA235&lpg=PA235&dq=impedance+mismatch+

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

1. A. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
2. B. OFDM was first introduced in 802.11 and is used by the ERP, HT and VHT PHYs as well.
3. C. OFDM implement BPSK modulation to allow for data rates up to 7 Gbps.
4. D. OFDM modulation is used only in 5 GHz 802.11 transmissions.

Correct Answer: D
Reference
http://www.rhyshaden.com/802_11a.htm

What statement about 802.11 WLAN performance is true?

1. A. In modern networks, both centralized and distributed data forwarding work well for most standard office deployments
2. B. In most WLANs, no special skill or tuning is required to get peak performance
3. C. WLANs perform better as more wireless clients connect with each AP
4. D. To get the best performance out of an AP, you should disable data rates of 72 Mbps and lower

Correct Answer: D

What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for 802.11 networks?

1. A. WPA2-Personal uses CCMP for encryption, and WEP-128 uses TKIP for encryption
2. B. WPA2-Personal uses dynamic encryption keys, and WEP-128 uses static keys
3. C. WPA2-Personal uses 802.1X/EAP for authentication, and WEP-128 uses preshared keys
4. D. WPA2-Personal is based on IEEE 802.11 industry standards, but WEP is not

Correct Answer: B

You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzer?

1. A. Frames with the HN bit set to 1
2. B. Frames with the retry bit set to 0
3. C. Frames transmitted from the AP without acknowledgement
4. D. Retransmitted frames from multiple STAs at higher rates than other STAs

Correct Answer: D
Reference
http://setup-wireless.blogspot.com/2008/11/wireless-hidden-node.html