CWTS-11-Performing an RF Wireless LAN Site Survey, itsp215/itsp216
Which frequency range are used in an 802.11a compliant WLAN? (Choose two)
C - 5.25 GHz UNII range D - 5.35 GHz UNII range
The length of a WEP key is typically _____________ or __________
C - 64-bit, 128-bit
RADIUS requires users on a wireless network to perform what functions?
C - Enter a username and password that will be centrally administered
Which WLAN technology can be used to obtain the highest data transfer rate possible?
C - HR-OFDM
802.11a/b/g/n/ac devices use what type of communication?
C - Half Duplex
What type of wireless network device is PIN based security most commonly used with?
C - SOHO brands that support WPS
What technology is used to send WLAN data over a wireless medium using many sub-carrier frequencies?
C - Spread Spectrum
Which 802.11 PHY technology specifies an 80 MHz-wide channel for transmitting and receiving data?
C - VHT-OFDM
What is the typical RF transmit power of a SOHO-grade access point?
15 dBm or 32 mW
Which IEEE 802.11 standard and which wireless access point grade can support Wi-Fi multimedia certifications and QoS?
802.11e Enterprise-grade
Ratified in 2005, which IEEE 802.11 amendment covers security?
802.11i
Which IEEE 802.11 standard and which wireless access point grade can support fast BSS transition (FT)?
802.11r Enterprise-grade
Which IEEE 802.11 standard and which wireless access point grade can support security management frames?
802.11w Enterprise-grade
Which IEEE standard does PoE fall under?
802.3 Ethernet
HR/DSSS devices operate in which frequency range?
A - 2.400 GHz ISM
DSSS uses which spreading code in 1 Mbps?
A - Barker
Which network access method attempts to avoid collision?
A - CSMA/CA
FM radio stations use what type of RF communication?
A - High power, narrow bandwidth
L2TP commonly uses which encryption method?
A - IPSec
You are a wireless network administrator monitoring the reports for the recently installed wireless intrusion prevention system. You receive an alert notifying you of high level of RF activity detected from an access point operating as a sensor and currently set to channel 6. Which problem could be causing the alert? (Choose two)
A - Interference from a neighboring access point C - RF DoS attack
Which functions does RBAC provide?
A - Restricts access to authorized users and groups
Which process is a VPN solution intended to provide for users connecting to a network?
A - Secure Layer 3 transmissions over a public network infrastructure
Which security methods do 802.11a/b/g access points support? (Choose three)
A - WPA Enterprise B - WEP E - MAC filtering
Both________and______________ are WLAN security methods that support shared key security. (Choose two)
A - WPA2 Personal D - WPA Enterprise
What devices, tools, or programs can be used in a manual site survey? (Choose two.) A. Spectrum analyzer B. Passive scanning utility C. Predictive site analyzer D. Association analyzer E. Authentication analyzer
A, B. A spectrum analyzer and a tool that passively scans for wireless networks such as NetStumbler can be used for a manual site survey. The other options' association and authentication can be viewed using a protocol analyzer and are not "standalone" tools.
You are using a wireless client adapter with a site survey utility and a notebook computer to perform a manual site survey in a very small office building. Which values are important to record to verify proper RF coverage for the location? (Choose two.) A. Signal strength B. SNR C. Packet retries D. Signal loss E. Propagation loss
A, B. The signal strength and SNR are two important values to record during the manual site survey process. Signal loss and propagation loss have different effects, and packet retries are more of an issue with dynamic rate selection.
The manual site survey consists of which possible methods? (Choose two.) A. Passive B. Scanning C. Active D. Spectrum E. Packet
A, C. Manual site surveys can be either passive or active. Scanning is a method of locating wireless LANs. A spectrum analyzer will allow you to see the RF. A packet is information that carries computer data from one device to another.
A main objective of a wireless LAN site survey is to determine _____ and _____ . (Choose the best two options.) A. Areas of RF interference B. Applications to be used C. Access point locations D. Wiring closet locations E. Security implementations
A, C. The main objectives of a wireless site survey are to determine areas of RF interference and RF coverage as well as locations of access points and other infrastructure devices. The applications used have more to do with capacity planning. Wiring closet locations and security implantations are factors that need to be taken into account but are not the main objectives.
Which guidelines are recommended when performing a manual site survey? (Choose two.) A. Walkthrough of location B. Predictive analysis C. Equipment purchase D. Client device configuration E. Spectrum analysis
A, E. A walkthrough of the location and spectrum analysis are both recommended guidelines when performing a manual site survey. Equipment purchase and client device configuration are additional factors to consider but are not part of the manual site survey. A predictive analysis is a software-based site survey solution that does not require manual testing.
A spectrum analyzer can be used to view what? A. Radio frequency B. Wireless packets C. Data rates D. Association frames
A. A spectrum analyzer can be used to view radio frequency. Wireless packets, data rates, and association frames can be viewed with a protocol analyzer.
Co-channel interference is caused by access points on _____ . A. Channels 1 and 1 B. Channels 1 and 2 C. Channels 1 and 6 D. Channels 1, 6, and 11
A. Co-channel interference is caused by two access points operating on the same radio frequency channel. Access points operating on channels 1 and 2 may cause adjacent channel interference. Channels 1, 6, and 11 are nonoverlapping channels and will not interfere with one another.
The 802.1X standard identifies that authenticator as another term for the ____________in wireless networking
B - Access Point
A newly configured wireless intrusion prevention system will ___________
B - Automatically monitor the network for potential attacks
The security amendment to the 802.11 standard requires___________
B - CCMP
How does the book define a consumer-grade access point?
Access points that are usually equipped with an Internet port, several ports for Ethernet connections, and a wireless access point.
Which devices are abbreviated by the initialism STA?
According to the IEEE 802.11 standard all wireless devices, including access points.
A self-contained unit with all the intelligence necessary to provide devices with wireless access to a wired network infrastructure and access to the resources the devices have permission to use.
Autonomous access point
What is the maximum data rate of HR/DSSS 802.11b device?
B - 11 Mbps
OFDM uses which communication channel width to exchange data?
B - 20 MHz-wide channel
You are a network administrator and are asked for a security recommendation regarding older wireless 802.11-compliant VoIP handsets. The company does not have the budget to upgrade the equipment at this time. Which would be the best recommendation you could provide?
B - Carefully plan a strategy using WEP and VLANs
Which two channels could be used so that the access points do not interfere with each other in an 802.11g/n wireless network? (Choose three)
B - Channel 1 and Channel 9 C - Channel 6 and Channel 11 D - Channel 2 and Channel 8
Which security solution is mandatory for client devices in order to be considered Wi-Fi Protected Setup certified?
B - PIN
Which security feature provides one of the strongest security methods for home based wireless networks?
B - Passphrase
A weakness with MAC address filtering is that it allows an intruder to ______________.
B - Spoof an address
How many access points can be co-located without channel reuse in the same RF area to maximize total system throughput while minimizing RF interference in an 802.11g/n network?
B - Three
Enterprise-grade access points commonly include three types of antennas, choose the correct antennas from this list: A) Multi-directional B) Semi-directional C) Omnidirectional D) Mostly directional E) Highly directional F) Half-directional
B) Semi-directional C) Omnidirectional E) Highly directional
Which of these statements is true? Choose two. A) All SOHO-grade access points have adjustable RF output power B) Some SOHO-grade access points have adjustable RF output power C) Some consumer-grade access points have adjustable RF output power D) All enterprise-grade access points have adjustable RF output power E) All consumer-grade access points have adjustable RF output power
B) Some SOHO-grade access points have adjustable RF output power D) All enterprise-grade access points have adjustable RF output power
Non-Wi-Fi interference for an 802.11g network can be caused by _____ and _____ . (Choose two.) A. AM radios B. Microwave ovens C. 802.11b networks D. Cordless phones E. Radar systems F. Digital TV systems
B, D. Non-Wi-Fi interference is interference by anything other than wireless LANs that operates in the same frequency range. AM radios and digital TV systems do not operate in the license-free bands. 802.11b interference is wireless LAN interference. Radar systems operate in the 5 GHz UNII band.
Which of the following is true of a predictive modeling survey? A. It takes more time than a passive survey to get accurate results. B. It takes less time than a passive survey to get accurate results. C. It finds areas of interference from neighboring wireless LANs. D. It helps you choose the manufacturer's equipment to be used for the wireless LAN.
B. A predictive modeling site survey will take less time than a passive survey because a passive survey requires a manual analysis. On-site protocol analysis or scanning utility will determine areas of RF interference from wireless LANs. The predictive modeling survey does not help you choose manufacturers' equipment to be used in a deployment.
When a device associates to an access point during a site survey, it is performing what type of survey? A. Predictive B. Active C. Passive D. Required
B. An active site survey requires the survey device to associate to an access point. A passive site survey monitors all access points in the area. A predictive modeling site survey does not involve associating to an access point. Associating to an access point is not a required part of manual testing.
You are performing a protocol analysis in order to determine potential interference from other wireless LANs in the immediate area of the site survey. You discover several wireless LANs that can potentially cause interference with the proposed installation. Which technology in use would not have an impact on the 802.11g wireless network you are surveying for? A. FHSS B. OFDM C. DSSS D. ERP-OFDM E. PBCC
B. OFDM networks operate in the 5 GHz UNII band and would not affect an 802.11g network that operates in the 2.4 GHz ISM band. FHSS, DSSS, and ERP-OFDM all operate in the 2.4 GHz ISM band and could cause interference with an 802.11g network.
You have been hired by a company to perform a wireless LAN site survey in a multitenant building. You discover numerous access points on channels 1, 6, and 11. To optimize the new deployment, what recommendation could you make to the customer? Assume that all new hardware will be purchased and backward compatibility is not required. A. Configure the access points to automatic channel selection for the 2.4 GHz ISM band. B. Configure the access points to operate in the 5 GHz band. C. Perform a spectrum analysis to find space in the 2.4 GHz band. D. Perform a predictive modeling site survey to determine which channels to use.
B. Since new hardware will be purchased and backward compatibility is not required, you could recommend using wireless network hardware that works in the 5 GHz band. This will eliminate interference from the other tenants that are using the 2.4 GHz ISM band. Automatic channel selection, spectrum analysis, and predictive modeling site survey will not help because surrounding access points already use the entire band.
You need to attend a business meeting out of town that requires air travel. You are in the airport and have some extra time. While waiting to board your plane you decide to check your office email using an 802.11g/n wireless hotspot access point at the airport. In order to provide a secure connection, you would enable your notebook computer to use_____________
C - VPN to the corporate network
A type of site survey that is software-based, requires minimum time on-site, and takes into consideration the attenuation value of materials such as the type of walls and doors is _____. A. Active B. Passive C. Predictive D. Optional
C. A predictive modeling site survey is software-based and takes the attenuation values of the building and other materials into consideration. Active and passive are forms of manual site surveys and record actual information about the site.
You have been hired by a company to perform a manual site survey. When explaining the difference between a manual and predictive modeling site survey, you let the customer know the advantages and disadvantages of each. A manual site survey has which advantage? A. Speed B. No hardware required C. Accuracy D. Facility access not required
C. Manual site surveys can be very accurate because actual readings are taken at the site using test access points and a wireless client. This can take quite some time to complete depending on the size of the location. Wireless hardware is required to perform the site survey, and access to the whole facility is required.
You are a network consultant hired to perform a manual site survey for a small office building. The wireless network to be installed will use data and voice. For backward compatibility, the customer needs to support 2.4 GHz equipment. To provide the highest quality of service for the voice application, you recommend that the received signal strength be a minimum ___ of for a data rate of 54 mbps. A. -20 dBm B. -25 dBm C. -67 dBm D. -76 dBm
C. Recommended received signal strength for voice applications in the 2.4 GHz ISM band at a data rate of 54 mbps is about -67 dBm. A recommended signal-to-noise ratio is more than 20 to 25 dB.
Without any regulatory domain taken into consideration, the 2.4 GHz frequency range allows for how many channels using 802.11b/g/n?
D - 14
An HR/DSSS channel is how wide?
D - 22 MHz
OFDM that is used with 802.11a and 802.11g stations supports a maximum data rate pf_________Mbps
D - 54
Stations operating in which two 802.11 amendments are interoperable?
D - 802.11b and 802.11g
Devices compliant with whcih two amendments to the IEEE standard use multiple radio chains and multiple antennas? (Choose two)
D - 802.11n E - 802.11/ac
Bluetooth devices use___________, which can potentially cause interference with WLANs.
D - Frequency-Hopping Spread Spectrum (FHSS)
Hiding the SSID of a WLAN will require a user to ___________in order to gain access to the wireless network
D - Know the SSID and enter it manually
Which WLAN technology in wireless networking uses the effects of multipath to provide data rates of 600 Mbps in the 2.4 GHz ISM band?
D - MIMO
Which data encryption/authentication method is identified in the original 802.11 standard?
D - WEP
When considering the use of antennas for wireless LAN deployment during a site survey, which antenna could be tested to verify proper coverage for a long hallway or corridor? A. High-gain omnidirectional B. Low-gain omnidirectional C. Parabolic dish D. Yagi
D. A semidirectional antenna such as a Yagi is a good choice for an application requiring coverage down a long hallway or corridor. Low- or high-gain omnidirectional antennas will provide 360-degree horizontal coverage. Parabolic dish antennas are typically used for outdoor long-range bridging.
When using a predictive modeling site survey approach, which of the following is true about manual verification? A. Manual verification never has to be performed. B. Manual verification is always required. C. Manual verification should be performed only at the customer's request. D. Manual verification should be performed, but it is not required.
D. A verification of the predictive survey should be performed to verify that the survey meets the customer's requirements. Although not required, it should be considered.
You are a network engineer tasked with performing a site survey for a multiple-channel architecture (MCA) system in a three-story building. Which characteristic must be considered while performing a site survey? A. All omnidirectional antennas should be vertically polarized. B. Multiple floors require the same channel. C. Each floor should be treated as an individual site survey. D. The channel plan should take all three floors into consideration.
D. Because of RF propagation, site surveys are really three-dimensional. Therefore in a three-story building all fl oors need to be taken into consideration. Omnidirectional antennas may be polarized either vertically or horizontally. Single-channel architectures use the same channel for multiple floors.
SOHO-grade access points also provide more advanced security features, such as user-based authentication ___________________ and _____________________.
IEEE 802.1X/EAP VPN pass-through
When performing a manual site survey, choose the best way to identify areas that lack RF coverage. A. Mark them with tape so they can be located at a later time. B. Use a camera to take a photograph and document it in the report. C. Show the site manager the areas that lack coverage. D. Document on the floor plans or blueprints.
D. Dead spots (areas that lack RF coverage) should be identified on floor plans or blueprints. This is part of standard documentation practices. Marking them with tape, taking a photograph, and showing the site manager in person are not the best ways to document dead spots.
You need to perform a site survey for a small real estate office that currently has no wireless network. Which factors must be considered as part of the site survey? A. Spectrum analysis B. Packet analysis C. Environmental conditions D. Correct antenna selection
D. In this situation, correct antenna selection is important to provide optimal coverage as well as proper aesthetics. In this example, a spectrum analysis or protocol analysis could be performed but is not required. Environmental conditions are typically not an issue in a small office deployment.
A______________filter is used to allow or deny wireless barcode scnners access to an 802.11b/g/n network
E - MAC
True or false, SOHO-grade access points usually have a more extensive feature set than enterprise-grade access points.
False
True or false, consumer-grade access points are typically equipped with NAT, DHCP, DNS services, and wireless repeater functionality.
False, wireless repeater functionality is typically not a feature of consumer-grade access points.
Which communication amendments are commonly supported by consumer and SOHO-grade access points?
IEEE 802.11b IEEE 802.11g IEEE 802.11n IEEE 802.11ac
Identify three of the four PCI card types, as they're generally listed i.e. not worrying about the stupid IA, IB, types
Mini-PCI Mini-PCIe Full Mini-PCIe Half Mini-PCIe
Half-duplex is defined as a ______-way communication that occurs in _______ direction at a time.
two one
_________________ is an extension to the IEEE 802.3 Ethernet standard that allows direct current voltage to be supplied over Ethernet cable to wireless access points.
Power over Ethernet
RF coverage is also known as the __________
RF cell or basic service area (BSA)
This advanced security feature allows for small- to medium-sized businesses to provide their own advanced authentication features without the need of an external server.
Remote Authentication Dial-In User Service (RADIUS)
The default operation mode for enterprise-grade access points.
Root Access Point Mode
This operation mode involves connecting the access point to a distribution system.
Root Access Point Mode
The logical name of a WLAN is
SSID
What is a wireless bridge?
The ability to connect two or more wired LANs together wirelessly using IEEE 802.11
True of false: Full-duplex allows two-way communication to occur between devices simultaneously
True
True or false, A cell is the area of RF coverage of the transmitter
True
True or false, It is common for SOHO-grade access points to be able to act as DHCP servers.
True
The Wi-Fi Alliance certifications include several standards for security and QoS listed in the chapter, name them.
WPA/WPA 2.0 for security WMM and WMM-PS for QoS
In December 2011, a security flaw was reported with _______
WPS
This operation mode for enterprise-grade access points can connect two or more LANs.
Wireless Bridge Mode
A ________ will help determine and have the potential to mitigate certain levels of wireless intrusions or attacks on the network.
Wireless Intrusion Prevention Systems (WIPS)
What can help detect a rogue access point?
Wireless Intrusion Prevention Systems (WIPS)
This operation mode for enterprise-grade access points can act to extend the RF cell.
Wireless Repeater Mode
Why is it better to configure access points from the wired side of the network?
You are not sending secure information over the internet.
Identify three popular types of autonomous access points:
consumer SOHO enterprise
Which grade of access points allow the user to change the transmit power?
enterprise and some SOHO
When a wireless device is connected to an access point, it is known to be in _____________ mode.
infrastructure mode
In infrastructure mode, what happens to wireless data traffic that passes through an access point?
it is passed through to it's intended destination, crazy huh
Replacing an antenna on a wireless access point will also change the __________ and ________________ beamwidths
vertical horizontal
What allows a variety of wireless client devices to access any network resources that the device or user may have permissions for?
wireless access points
