Wireless Security Midterm – Flashcards
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Which type of remote wireless bridge connection is used to connect multiple LAN segments, or buildings together?
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point-to-multipoint
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Which of the following is connected inline to each end device and adds power to the line?
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midspan device
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If you are installing an access point on a ceiling, but find there are no electrical outlets nearby to provide power to the AP, what technology should you deploy?
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POE
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Wireless NICs perform the same function as a wired NIC except for which of the following?
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no RJ-45 connection
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De facto standards are official standards.
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False
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Which of the following is NOT a major part of an autonomous access point?
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wireless switch
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Which of the following is true about infrared transmissions?
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diffused transmission relies on reflected light
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WLANs are based on de jure standards.
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True
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What are the two components that make up the Windows 7 wireless Hosted Network function?
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Virtual Wifi, SoftAP
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Windows Vista and Windows 7 use which software for configuring wireless NICs?
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WLAN AutoConfig
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Which of the following is a viable option for a large enterprise or campus wireless network?
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lightweight access point
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If a remote wireless bridge is in repeater mode it functions as a standard AP only and does not communicate with other remote wireless bridges.
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False
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Which IEEE standard added speeds of 5.5 and 11 Mbps to the WLAN standards?
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802.11b
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A directed transmission requires a line of sight path from emitter to detector.
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True
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The IEEE 802.11g standard requires the strongest level of wireless security.
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False
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If a remote wireless bridge is set to ____, it can only transmit to another bridge in root mode.
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nonroot mode
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Which of the following statements is true about the 802.11g standard?
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speeds up to 54 Mbps and same radio frequency as 802.11b
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Which is NOT a limitation of infrared wireless systems?
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doesn't work well indoors
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Which of the following is true of the CardBus form factor?
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has a bus mastering feature
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Which of the following provides the management and configuration functions for a thin access point?
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wireless LAN controller
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Which of the following is an electromagnetic wave?
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All of the above
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Power of an electromagnetic signal such as one used in WLANs is measured by which unit?
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milliwatts
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Which describes the natural loss of signal strength through space?
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free space loss
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Which is caused by small objects or rough surfaces as an RF signal travels through the air?
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scattering
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Which is a method of measuring RF power that can be used as a comparison between two values and gives a better picture of the loss or gain?
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relative scale
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What does a loss of 10 decibels mean with respect to the percent of power loss in mW?
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90%
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What is the positive difference in amplitude between two signals?
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gain
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What is the term that describes the ratio of desired signal to undesired signal in the average power level of a transmission?
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SNR
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____ modulation changes the number of waves representing one cycle.
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Frequency
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The term ____ describes the rate of electrical flow.
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current
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Electromagnetic waves travel through space at the speed of light.
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True
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Which type of modulation changes the starting point of the cycle to represent a change from a 1 bit to a 0 bit and vice versa?
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PM
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Which value can be measured by the circuitry on a wireless NIC to determine if it is clear to send its transmission?
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RSSI
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One of the units of measurement used to represent RF signal strength is Ohms.
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False
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Whenever a wave moves to the maximum voltage, then down to the minimum voltage, and then returns back to the starting point, it has finished two cycles.
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False
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Which of the following units is used to measure frequency?
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hertz
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Mulitple copies of an RF signal may reach the receiver at different times due to reflection.
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True
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The ASK 1 bit has a carrier signal (positive voltage) while a 0 bit has no signal (zero voltage).
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True
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What units are used to measure RF power gain and loss on a relative scale?
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dB
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When an RF signal moves from one medium to another of a different density the signal actually bends instead of traveling in a straight line. This is known as ____.
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refraction
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A method of roaming between APs that are separated by a router is referred to as which of the following?
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Mobile IP
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When an AP accepts or rejects a wireless device it sends a(n) ____ frame.
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association response
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Which is true of passive scanning?
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a station listens for a beacon frame with an SSID for a set period of time
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Following authentication, if the access point accepts the wireless device, it reserves memory space in the AP and establishes a(n) ____ ID for it.
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association
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The 802.11n standard adds a feature to CSMA/CA which is necessary for A-MPDU aggregation called which of the following?
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virtual carrier sensing
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____ effectively prevents collisions because every device must wait until it receives permission before it can transmit.
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Polling
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What is the default authentication method according to the 802.11 standard?
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open system
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Which of the following is true about RTS/CTS?
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the RTS indicates the length of time needed for the transmission and ACK
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Which of the following describes the process of a wireless device switching from one AP to another?
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handoff
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The HCF channel access method allows for prioritized traffic types.
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True
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Which of the following is true about wireless network operation modes?
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a WLAN operating in ad hoc mode does not use an AP
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A BSS is served by one or more APs.
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False
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Increasing the beacon interval will normally increase wireless network traffic as well.
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False
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At regular intervals the AP sends a ____ frame to both announce its presence and to provide the necessary information for other devices to join the network.
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beacon
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On ESS networks that have multiple access points, the wireless device might actually receive beacon frames from several APs. Which AP would a wireless device generally choose in this case?
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the one with the strongest signal strength
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In which access method does the access point serve as the polling device?
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PCF
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A major function of the MAC layer involves defining procedures for a wireless device to discover the WLAN.
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True
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What is the first step in shared key authentication?
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wireless device sends an authentication frame to the AP
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CSMA/CD cannot be used with wireless networks because it is difficult to detect collisions on a wireless LAN.
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True
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Which is true about the CSMA/CD media access method?
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the hidden node problem makes it unsuitable for wireless networks
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What happens when an AP sends a DTIM?
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all stations change to active mode
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Which is NOT an advantage of single channel architecture?
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AP coverage does not overlap
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Which is true of a wireless mesh network?
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only one AP must be connected to the wired network
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What should you deploy if you manage a public hotspot and want users to agree to a policy or present credentials before using the WLAN?
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captive portal AP
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In a controller-based architecture lightweight access points are replaced by autonomous APs.
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False
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A DCF contention method is designed to provide priority handling to certain types of traffic.
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False
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Which type of wireless network uses the ATIM window?
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IBSS
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BSS and ESS service set configurations remain the preferred choice for homes and SOHOs.
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True
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Which wired device is a WLC most similar to?
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managed switch
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Which technology works by inserting a tag header within the existing Ethernet packet?
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802.1Q trunking
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Which network area are you likely to find LAN routers and Layer 3 switches?
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workgroup layer
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Which of the following is true of wireless VLANs in which the AP is responsible for separating packets for the correct VLAN?
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different VLANs are transmitted by the AP on different SSIDs
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Which power management technology is designed to be used with MIMO devices?
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SMPS
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Which system allows APs and other network equipment to be connected through the Internet and managed from one central location?
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cloud management
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A thin access point is one in which the intelligence for wireless management is contained within the AP itself.
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False
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In an 802.11b network, which channels are nonoverlapping?
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1, 6, 11
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The capability to prioritize different types of frames is known as which of the following?
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quality of service
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Which of the following are NOT enhanced power management technologies?
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continuous aware mode
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A distributed WLAN architecture can be described as which of the following?
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an ESS that uses multiple autonomous access points
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A WLC is at the heart of a controller-based architecture.
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True
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A WLC is at the heart of a controller-based architecture.
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True
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A WLC is at the heart of a controller-based architecture.
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True
