What HT technology requires MIMO support on both the transmitter and receiver?
A. Spatial multiplexing
B. Shot guard intervals
C. Maximal ratio combining
D. Orthogonal Frequency Division Multiplexing
What phrase defines Equivalent Isotropically Radiated Power (EIRP)?
A. The power output from theradio into the RF cable
B. The power output from the radio after cable losses
C. Thehighest RF signal strength that is transmitted from a given antenna
D. Power supplied from the transmission line to the antenna input
You are the network administrator for ABC Company. Your manager has recently attended a wireless security seminar. The seminar speaker taught that a wireless network could be hidden from potential intruders if you disabled the broadcasting of the SSID in Beacons and configured the access points not to respond to Probe Request frames that have a null SSID field.
Your manager suggests implementing these security practices. What response should you give to this suggestion? (Choose 2)
A. Any 802.11 protocol analyzer can see the SSID in clear text inframes other than Beacons and Probe Responseframes. This negates any security benefit of trying to hide the SSID in Beacons and Probe Response frames.
B. This security practice prevents manufacturers' client utilities from detecting the SSID. As a result,the SSID cannot be obtained by attackers, except through social engineering, guessing, or use of a WIPS.
C. Although it does not benefit the security posture, hiding the SSID in Beacons and Probe Response frames can be helpful for preventing some users (such as guests) from attempting to connect tothe corporate network.
D. Any tenants in the same building using advanced penetration testing tools will be able to obtain the SSID by exploiting WPA EAPOL-Key exchanges. This poses an additional risk of exposingthe WPA key.
E. To improve security by hiding the SSID, the AP and client stations must both be configured to remove the SSID from association request and response frames. Most WLAN products support this.
Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even whenthe two APs are operating on non-overlapping channels (e.g. 1 and 6).
What deployment flaw could cause this problem?
A. The access points are mounted too closely to one another.
B. Reflective objects in the area are causing significant multipath.
C. A client station is using active scanning to probe for access points on multiple channels.
D. The access points are not synchronized to the same NTP server.
When a client moves to a new BSS within an ESS, what steps arepart of the 802.11 reassociation process? (Choose 2)
A. The client station transmits a Reassociation Request frame to its current access point.
B. The current access point informs the IP gateway of the reassociation.
C. The current access point triggers the client's reassociation service.
D. The new access point transmits a Reassociation Response to the client station with a status value.
E. The client and new access point create unicast encryption keys.
F. The client station transmits a deauthentication frame to the current access point.
Whatfactors are likely to cause the greatest impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS? (Choose 3)
A. Use of WEP or TKIP for encryption instead of CCMP
B. Use of passphrase authentication instead of 802.1X/EAPauthentication
C. Increasing the beacon interval from 100 to 200 (TUs)
D. RF interference from more than 10 nearby Bluetooth transmitters
E. Increasing or decreasing the number ofspatial streams in use by the client station and AP
XYZ Company has hired you to perform an indoor site survey of their 5-storyfacility. They own the building and rents out unused floors (floors 2 and 4) to other companies, and the other companies already use
802.11 WLANs. XYZ Company wants all of the offices they occupy to be surveyed as part of the project.
What actions should be recommended as part of the site survey project? (Choose 2)
A. Verify that RF signals from XYZ Company's APs are not penetrating outside the perimeter of the building.
B. Determine how much signal strength is passing between floors.
C. Locate wiring closets on each floor occupied by XYZ Company.
D. Identify security best practice violations on neighboring WLANs.
E. Verify that XYZ Company's APs are not directly above or below APs on adjacent floors.
If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and reflected paths, what effect will the reflected signal have on the signal that took the direct line-of-sight path?
A. Thedirect signal will only be received if the reflected signal is more than 180 degrees out of phase.
B. The direct signal cannot be received if the indirect signal is less than 90 degrees out-of- phase.
C. The signals will be distorted if the indirect signalarrives simultaneously at the receiver, but 90 degrees out-of-phase.
D. If the signalsare in-phase, they will combine together, cancel one another out, and create a null.
Return Loss is the decrease of forward energy in a system when some of thepower is being reflected back toward the transmitter.
What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?
A. A Voltage Standing Wave Ratio (VSWR) of 1:1
B. An impedance mismatch between components in the RF system
C. The use of cables longer than onemeter in the RF system
D. High output power at the transmitter and use of a low-gain antenna
Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive modeling software forsurveying, but the company insists on a pre- deployment site visit.
What task should be performed as part of the pre-deployment visit to prepare for a predictive survey?
A. Evaluatethe building materials at ABC's facility and confirm that the floor plandocuments are consistent with the actual building.
B. Test several antenna types connected to the intended APs for use in the eventual deployment.
C. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers.
D. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls.
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