var quiz = { questions : [ { text : 'Which 802.11 physical layer offers the highest capacity?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ '802.11a', '802.11n', '802.11b', '802.11p' ], answer : 1, score : 1, expandedAnswer : '802.11n offers the highest capacity and is also backward-compatible with earlier standards, such as 802.11g and 802.11a.', moreInfo : 'Learn how to set up your client\'s WLAN solution in this feature story on SearchNetworkingChannel.com.' }, { text : 'What protocol does 802.11n use?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'CIFS', 'Ethernet', 'iSCSI', 'None of the above' ], answer : 1, score : 1, expandedAnswer : 'A 100 Mbit Ethernet link was sufficient to connect an 802.11g AP to the switch. Gigabit Ethernet will be required for 802.11n. The extent of required changes offers VARs and integrators an opportunity to perform an extensive network analysis and redesign.', moreInfo : 'Find out about the system integration opportunities that the 802.11n creates in this tip.' }, { text : 'What percentage of enterprises use WLANs to connect computers that may be used in mission-critical situations?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ '5% to 10%', '10% to 15%', '15% to 20%', '25%' ], answer : 2, score : 1, expandedAnswer : 'About 15% to 20% of enterprises use WLANs to connect computers that may be used in mission-critical situations, like payroll or pulling up customer records. Security is historically one of the biggest concerns that companies have had about setting up a wireless LAN, but security is becoming less of an issue as the technology matures.', moreInfo : 'Find out why setting up WLANs will benefit your client\'s business in this feature story.' }, { text : 'What should be your first step when installing a wireless LAN for business?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'Do a site survey, consisting of deploying a few APs in key areas at your client\'s site and then testing signal strength throughout the area.', 'Talk with your client to understand what will be connecting to the WLAN and how that is expected to change in the future.', 'Make sure your vendor\'s tools fit your client\'s needs.', 'Figure out how much capacity your client will need and where it will be needed. ' ], answer : 3, score : 1, expandedAnswer : 'In many cases, just getting APs to cover your client\'s site isn\'t all that difficult -- the challenge is to make sure there are enough access points, and in the right places, to accommodate your client\'s needs.', moreInfo : 'Learn more about wireless LAN installation in this Hot Spot Tutorial chapter on WLAN installation.' }, { text : 'This WLAN troubleshooting tool lets you visualize spectrum utilization and spot energy pulses occurring at the same frequencies used by your customer\'s WLAN and APs. ', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'RF spectrum analyzers', 'WLAN connection managers', 'WLAN discovery tools', 'WLAN traffic analyzers' ], answer : 0, score : 1, expandedAnswer : 'If a Wi-Fi client experiences intermittent failures, highly variable response times or excessive errors, the culprit might not be Wi-Fi, but another device using the same portion of the RF spectrum.', moreInfo : 'Our Channel Checklist offers the top five tools you\'ll need for troubleshooting a WLAN.' }, { text : 'What encryption solution is included in the 802.11 WLAN standard?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'IEEE 802.1X', 'Wi-Fi Alliance\'s Wi-Fi Protected Access (WPA)', 'Wired equivalent privacy (WEP)', 'The 802.11 standard does not offer native encryption.' ], answer : 2, score : 1, expandedAnswer : '). The 802.11 standard offers wired equivalent privacy (WEP) for encrypting data sent between wireless stations, but the vulnerabilities of WEP are well documented. As a result, vendors offering enterprise-grade wireless access points generally include enhanced security features, such as IEEE 802.1X along with dynamic key allocation and management.', moreInfo : 'For more information on wireless access points, check out our tip on selecting a wireless access point vendor.' }, { text : 'What do you need to perform a traditional RF site survey?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'A laptop', 'An applicable 802.11 PC card', 'Site survey software', 'All of the above' ], answer : 3, score : 1, expandedAnswer : 'The traditional method of performing an RF site survey includes a laptop equipped with an applicable 802.11 PC card (802.11a, 802.11g or 802.11n) and site survey software supplied at no additional cost from the radio card vendor. The software features vary greatly by vendor, but they all display the strength and quality of the signal emanating from the access point. This helps determine effective operating range (i.e., coverage area) between end users and access points.', moreInfo : 'Find out how to use an RF site survey for WLAN installations in this SearchNetworkingChannel.com tip.' }, { text : 'What is the default value for the beacon interval when configuring wireless access points?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ '10 beacons sent every second', '12 beacons sent every second', '4 beacons sent every second', '20 beacons sent every second' ], answer : 0, score : 1, expandedAnswer : '. The default value for this interval is generally 10 ms, that is, 10 beacons sent every second. This is sufficient to support the mobility speed of users within an office environment. You can increase the beacon interval and have lower overhead on the network, but then roaming will likely suffer.', moreInfo : 'Learn how to configure your client\'s wireless access points in this SearchNetworkingChannel.com tip.' }, { text : 'Which method for extending the wireless access point range effectively adds 6 dB to the system?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'Adjusting the transmit power', 'Relocating the access point', 'Considering RF amplifiers', 'Utilizing higher-gain antennas' ], answer : 3, score : 1, expandedAnswer : 'Most of these higher-gain antennas effectively add 6 dB to the system, which equates to a fourfold increase in signal power. Even though that doesn\'t exactly multiply the range by four, it does make a big difference in range.', moreInfo : 'Find out how to extend your client\'s wireless access point range in this tip.' }, { text : 'How does the power usage of the 802.11n physical layer compare to that of 802.11g?', img : 'http://media.techtarget.com/WhatIs/images/spacer.gif', responses : [ 'Half as much', 'Twice as much', 'Three times as much', 'The same amount' ], answer : 1, score : 1, expandedAnswer : '11n APs also use about twice as much power as 11g, which means they can\'t be powered by standard Power over Ethernet (PoE). Because most enterprise APs are installed in office ceilings, running a separate power cord to each one would not be practical.', moreInfo : 'Learn how you can help your customers reap the benefits of 802.11n in this chapter of our Hot Spot Tutorial on WLANs.' } ] };