CWTS-2-Introduction to Wireless Local Area Networking

802.11b is capable of which of the following data rates? (Choose 3.) A. 1 Mbps B. 6 Mbps C. 5.5 Mbps D. 11 Mbps E. 12 Mbps

A, C, D. 802.11b can use 1, 2, 5.5, and 11 Mbps. 6 and 12 Mbps are OFDM data rates and used in 802.11a and 802.11g networks.

Point-to-point links typically use which antenna types? (Choose 2.) A. Semidirectional B. Omnidirectional C. Highly directional D. Long-range omnidirectional

A, C. Semidirectional and highly directional antennas are used for point-to-point links. Omnidirectional antennas are for point-to-multipoint links. Long-range omnidirectional antennas do not exist.

802.11g is backward-compatible with which of the following IEEE wireless LAN standards? (Choose 2.) A. 802.11 DSSS B. 802.11a OFDM C. 802.11a ERP-OFDM D. 802.11b HR/DSSS E. 802.3af

A, D. 802.11g is backward compatible with DSSS and HR/DSSS. 802.11a OFDM operates in the 5 GHz band. ERP-OFDM is not used in 802.11a technology and 802.3af is for Power over Ethernet (PoE).

Which two of the following options are available for Wi-Fi Protected Access 2 (WPA 2.0)? A. Personal mode B. Protection mode C. Professional mode D. Enterprise mode E. WPA 2 mode

A, D. WPA 2.0 consists of personal mode using passphrase and enterprise mode using 802.1X/EAP.

IEEE 802.11n devices use an enhanced radio technology known as multiple-input multipleoutput (MIMO). Which statement correctly describes a benefit of MIMO? A. MIMO uses reflections to allow for increased throughput. B. MIMO rejects reflections to allow for increased throughput. C. MIMO uses a single radio with diversity technology for increased throughput. D. MIMO rejects data rates less than 54 Mbps for increased throughput.

A. MIMO can use reflections due to the multiple radio chain technology. Reflections will hurt throughput in a single-input single-output (SISO) technology. Antenna diversity is used with SISO to lessen the effects of reflections.

In the 802.11a amendment, the UNII-3 band can be used for which of the following WLAN applications? A. Indoor and outdoor B. Outdoor only C. Indoor only D. The UNII-3 band cannot be used for WLANs.

A. The UNII-3 band can be used indoors or outdoors, but was at one time mainly used outdoors only.

Wi-Fi Protected Setup was designed for which of the following wireless applications? A. Small office/home office (SOHO) organizations B. Enterprise organizations C. FCC interoperability D. Security organizations

A. Wi-Fi Protected Setup was designed with SOHO users in mind. Enterprise organizations use IEEE 802.11i, WPA, and WPA2 certifications. The FCC is the local regulatory authority responsible for frequency regulation in the United States.

You support a wireless network for an office of five employees. The installation consists of one access point, three notebook computers, and two desktop computers. The access point and computers in the office have wireless adapters that are Wi-Fi WPA 2.0 Certified. You want to use the highest level security possible without additional cost or administration. Which of the following solutions would be best for this deployment? (Choose 2.) A. WEP B. WPA 2.0 personal C. WPS D. WMM E. WPA 2.0 enterprise

B, C. WPA 2.0 Personal and WPS are both designed with the small business in mind. Wired Equivalent Privacy (WEP) is legacy and not secure. Wi-Fi Multimedia (WMM) addresses QoS, and WPA 2.0 enterprise is designed for larger organizations.

Point-to-multipoint links consist of or more connections. A. Two B. Three C. Four D. Five

B. Point-to-multipoint links typically have three or more connections.

Which of the following best describes the Wi-Fi Alliance? A. U.S.-based standards organization B. Interoperability testing organization C. Works with the FCC to verify compliance D. Local regulatory body for Europe

B. Wi-Fi Alliance performs interoperability testing for IEEE 802.11 wireless LAN standards-based equipment. The IEEE creates standards. The FCC is the local regulatory authority responsible for frequency regulation in the United States and ETSI is a European standards organization responsible for producing standards for information and communications technologies.

The 802.11g standard uses which two Physical layer technologies? (Choose 2.) A. FHSS B. OFDM C. ERP-OFDM D. DSSS E. MIMO

C, D. 802.11g can use ERP-OFDM and DSSS. The 802.11 standard specifies FHSS for 1 and 2 Mbps. OFDM is used with 802.11a devices, and MIMO (multiple-input multiple-output) is used with 802.11n technology.

IEEE 802.11a uses which PHY technology? A. ERP-OFDM B. HR/DSSS C. OFDM D. FHSS

C. 802.11a uses OFDM; ERP-OFDM is used in 802.11g. HR/DSSS is used with 802.11b and 802.11g. FHSS is specifi ed in the original IEEE 802.11 standard and is obsolete with respect to modern Wi-Fi technology.

The 802.11i amendment to the standard addresses which of the following technologies? A. Quality of service B. DSSS C. Security D. MIMO

C. 802.11i addresses security. 802.11e addresses quality of service. DSSS is a PHY technology defined in the IEEE 802.11 standard, and MIMO (multiple-input multiple output) is used with IEEE 802.11n technology.

Which of the following is correct regarding 802.11e? A. Only operates in the 5 GHz frequency range B. Only operates at 1, 2, 5.5, and 11Mbps C. Addresses wireless security D. Addresses wireless quality of service

D. 802.11e is a specific function amendment addressing quality of service. 802.11e can operate in either the 5 GHz frequency range or the 2.4 GHz frequency range. 802.11i addresses wireless security, and 802.11e can work with all data rates, not only 1, 2, 5.5, and 11 Mbps.

IEEE 802.11g WLANs operate in what frequency range? A. 900 MHz B. 5.15-5.25 GHz C. 5.25-5.35 GHz D. 2.4-2.5 GHz

D. 802.11g LANs operate in the 2.4-2.5 GHz ISM band. 900 MHz is not used with 802.11 wireless LANs, and 5 GHz is for 802.11a.

What organization is responsible for unlicensed frequency band regulation in the United States? A. ETSI B. Wi-Fi Alliance C. IEEE D. FCC E. WPA

D. The FCC is the local regulatory authority responsible for frequency regulation in the United States. ETSI is a European standards organization responsible for producing standards for information and communications technologies. The Wi-Fi Alliance is an interoperability testing organization. The IEEE creates standards, and WPA is a pre-802.11 certification by the Wi-Fi Alliance.

According to the 802.11a amendment, which of the following data rates are mandatory? A. 1, 2, 5.5, and 11 Mbps B. 6, 24, and 54 Mbps C. 6, 9, 12, 18, 24, 36, 48, and 54 Mbps D. 6, 12, and 24 Mbps E. 1, 6, 12, and 24 Mbps

D. The IEEE requires 6, 12, and 24 Mbps for 802.11a. The data rates of 1, 2, 5.5, and 11 Mbps are for the 2.4 GHz band and 802.11b/g.

Which of the following is addressed by the Wi-Fi Multimedia (WMM) certification? A. Security/encryption B. Fast transition C. Management frame protection D. Quality of service

D. WMM is a proactive Wi-Fi Alliance certification for quality of service. WPA and WPA are certifications that address wireless security. IEEE 802.11w is for protection of management frames and IEEE 802.11r is for Fast Transition (FT); neither currently has an associated Wi-Fi Alliance certification.

WPA was developed as an interim solution for which amendment to the 802.11 standard? A. 802.11a B. 802.11n C. 802.11e D. 802.11i E. 802.11g

D. WPA was designed as a pre-802.11i solution for wireless security and intended as an interim certification. 802.11a, 802.11n, and 802.11g are communication amendments, and the 802.11e amendment specifies quality of service.

Which of the following organizations is responsible for standards compliance? A. FCC B. ETSI C. IEEE D. WPA2

E. The Wi-Fi Alliance performs interoperability testing and verifies standards compliance. The FCC is the local regulatory authority responsible for frequency regulation in the United States. ETSI is a European standards organization responsible for producing standards for information and communications technologies. The IEEE creates standards and WPA2 is a post-802.11 certification by the Wi-Fi Alliance.