NCTI Introduction to Networking – Wireless Practice Test

These questions are part of the practice quiz. Start practicing

• What is a man-in-the-middle attack on a WLAN?
• Why should all data collected during a WLAN site survey be included in the survey report as attachments or appendices?
• Which arrangement allows higher throughput by combining different 802.11 technologies in the same area?
• Which two MAC modes are described as coexisting in 802.11 WLANs?
• Define a rogue AP and one common mitigation technique.
• Which task is the best choice for troubleshooting the near/far problem?
• What does PCF stand for in 802.11 terminology?
• What is the FCC regulation for the maximum equivalent isotropically radiated power (EIRP) from a point-to-multipoint WLAN antenna?
• Explain the hidden node problem and how RTS/CTS helps.
• Which statement best describes Port-Based Network Access Control (PNAC)?
• What happens when an active Ethernet switch fails to sense a PoE device on a port?
• Which RF behavior is defined as the bending of a wave as it passes through a medium of different density?
• What is channel bonding and what widths are typical in 802.11ac/ax?
• Which details should be captured about APs in a WLAN site survey?
• What is the role of Router Advertisements in IPv6 SLAAC?
• Which of the following are common RF interference sources affecting 2.4 GHz WLANs?
• What is the purpose of conducting a wireless site survey?
• In which OSI reference model layer do WLANs operate?
• What unit of measurement is used to express the gain of an antenna?
• As a subscriber enters a hotspot area, what signals their mobile wireless device of an available Wi-Fi network?
• Compare the 2.4 GHz and 5 GHz bands in terms of range, data rate, and interference.
• DSSS channel center frequencies are spaced by how many megahertz?
• Where should impedance-matched hardware be used to optimize RF energy transfer?
• Access points must support what encryption techniques to comply with IEEE 802.11i security standards?
• Which statement is true concerning Bluetooth technology?
• Why are DHCP and DNS important for wireless clients?
• After a client authenticates to an AP, what is the next stage the client enters to begin data exchange?
• In enterprise networks, WLANs are most commonly deployed at which architectural layer to serve end-user connectivity?
• What is the purpose of band steering in a wireless network?
• Bluetooth is a short range wireless personal area network (WPAN) technology that is covered under which IEEE standard?
• What challenges do WISPs have to overcome in order to provide 'last mile data delivery' to customers?
• Spread spectrum is used in Bluetooth wireless personal area networks (WPAN) because it enables which capability?
• Which of the following is true about 802.11ac?
• If a semidirectional antenna is required for adequate coverage, what should be noted in the site survey?
• Before visiting a facility for a WLAN site survey, what is the most basic question you should ask the customer?
• Which device would a WLAN administrator install between an AP and the network to maximize bandwidth available to indoor users?
• What is BSSID and how does it relate to a specific AP?
• Which statement accurately describes a passive injector?
• Bluetooth uses which spread spectrum technology?
• For maximum security, you should base WLAN user authentication on which one of the following?
• What is the first question you should ask before performing a WLAN site survey?
• The Federal Communications Commission (FCC) rules regarding power output for frequency-hopping spread spectrum (FHSS) state that a maximum output to the intentional radiator (IR) with 5 megahertz (MHz) of carrier frequency bandwidth must be which one of the following?
• What type of WLAN attack could cost an employee their job because logs point directly to the employee whenever a hacker gains access to the employee's domain login information and causes havoc on the network?
• The ratio of the chipping code to data bits for a direct sequence spread spectrum (DSSS) signal is called which of the following?
• Why would a WLAN administrator rarely see the 'authenticated' step on the AP?
• How does 802.1X authentication work with WPA2/WPA3-Enterprise?
• How do building materials affect wireless signal propagation?
• What is the purpose of a spectrum analyzer in wireless site surveys?
• Explain MIMO and its impact on wireless performance.
• What practical adjustment can improve floor coverage when a high-gain indoor omnidirectional antenna is mounted on a very high ceiling?
• Which one of the following power management modes populates a TIM in a BSS or ESS?
• A wireless workgroup bridge is best suited for which scenario?
• Which frequency band is explicitly described as an Unlicensed National Information Infrastructure (U-NII) band in the material?
• Why are WLANs usually deployed in an access capacity rather than the network core layer?
• To increase coverage area, which frequency band is preferred over the other?
• Which of the following best describes a semidirectional antenna's typical application?
• Why is shared key authentication considered a security risk in a WLAN?
• Which statement best describes GPS use of spread spectrum?
• What is the purpose of disabling WPS on a wireless router?
• Ideally, what is the recommended next step after completing a WLAN site survey and delivering the report to the customer?
• Which IEEE 802.11 device family was connected by the added residential gateway capability?
• How does a client locate a WLAN during passive scanning?
• How are interframe spaces used in an IEEE 802.11 WLAN?
• What is the maximum range of Class 2, 2.5 milliwatt (mW) Bluetooth devices?
• Enabling RTS/CTS before data transmission is expected to improve performance in which scenario?
• Which enterprise gateway feature provides quick assignment of identical network access rights to people in the same workgroup?
• Why is keeping firmware up to date on access points important?
• What term describes sampling two antennas to pick the input signal from the best reception?
• An independent basic service set (IBSS) is commonly referred to as which type of network?
• What device picks off the direct current (DC) voltage injected into the CAT-5e cable by the injector and makes it available to equipment through the regular DC power jack?
• What is the difference between a bridge and a router in wireless networks?
• Enabling 5 GHz is a recommended mitigation for interference in crowded WLANs because 5 GHz has more channels and less congestion. Which option best describes this?
• What term describes seamless handoff between wireless access points as a client moves within the coverage area?
• Blocking the Fresnel zone can cause RF signal interference. What effect does this have on the RF link?
• Which of the following options lists IPv4 private address ranges commonly used in LANs?
• What is EDCA and how does it influence WLAN QoS?
• What is the difference between WIDS and WIPS?
• What does BSS stand for in WLAN terminology?
• Which factor helps ensure hospital WLAN supports reliable medical applications during a site survey?
• What is the largest IEEE 802.11 data frame that can traverse a WLAN without fragmentation?
• Why is transmit power control important when deploying APs?
• Which characteristics describe WLAN requirements in a hospital that make it a strong training ground for WLAN technology?
• How would you respond to a site survey report showing high co-channel interference in the 2.4 GHz band?
• Which device picks off the DC injected into CAT-5e by the injector and makes it available to powered equipment through its DC jack?
• Which statement correctly contrasts WPA2-Enterprise and WPA2-Personal?
• For a WLAN site survey at a convention center preparing for a trade show, which information should be identified to plan installation?
• How do radio waves propagate away from the source?
• IEEE 802.11ac devices operate only in the 5 GHz Unlicensed National Information Infrastructure (U-NII) radio band. How are they able to maintain compatibility with older standards that operate in the 2.4 GHz ISM band?
• What basis does a WLAN use IEEE 802.1x protocol to control network access?
• Which term describes the operation mode of a basic service set (BSS)?
• Why is the Fresnel zone important to the integrity of the RF link or path?
• In a segmented WLAN with a different IP address for each segment, which solution allows mobile clients to maintain connectivity when roaming into different segments?
• Which statement describes the benefits and risks of broadcasting versus hiding an SSID?
• How wide is each of the three WLAN U-NII bands?
• Which transmission technology besides radio frequency is specified by IEEE 802.11 according to the material?
• Which organization defines the rules for FHSS power output under CFR Part 15?
• Which networks or products use spread spectrum technologies?
• How might a WLAN administrator ensure compliance with security audits?
• What specific problem does a WLAN resolve for corporations and home users?
• IEEE 802.11i security standards require support for which encryption techniques?
• Which of the following is true about an Ad Hoc network?
• Which security service enables a network administrator to assign levels of service to a particular user?
• What does a basic service set (BSS) consist of?
• In OFDMA, what is the benefit of dividing the channel into resource units?
• Which aspect is most important to note when a semidirectional antenna is used to ensure coverage and security?
• Which methods are commonly used to configure and manage APs?
• Which IEEE 802.11 standards are stated to use OFDM to achieve higher throughput?
• Which modulation technique do 802.11a, 802.11n, and 802.11ac use to achieve higher data throughput?
• When mounting a high-gain omnidirectional antenna indoors on the ceiling, what is a key consideration?
• Why should you avoid channel overlap in 2.4 GHz and what is the recommended non-overlapping set?
• Which wireless client devices require drivers to be installed on the client node?
• What is the tradeoff between fragmenting packets into shorter fragments compared to using longer fragments?
• What test instrument is used to locate and measure interfering narrowband RF signals in an IEEE 802.11 WLAN, among other things?
• Which protocol helps mitigate hidden node problems by coordinating transmissions?
• How is a hidden node typically troubleshooted?
• Which VSWR value is best for transferring RF energy between connections?
• Which EAP method uses TLS to create a protected tunnel and commonly relies on a username and password for authentication?
• What is the primary benefit of MU-MIMO?
• What are some measures that can be taken to prevent high VSWR in transmitters and receivers?
• Which diagnostic commands are commonly used to verify IP configuration and network reachability?
• Which term describes a network formed by multiple BSSs interconnected to enable seamless roaming?
• Which statement best describes wireless roaming and the role of fast roaming mechanisms?
• Polarization is defined as which of the following?
• What term describes a wireless system in which the AP removes the WLAN's SSID from the beacon frames?
• Which OSI layer is associated with WLAN data framing and MAC addressing?
• What causes co-channel interference in a WLAN?
• What is the maximum data rate that IEEE 802.11n can achieve according to the material?
• Which action best describes isolating guest traffic in a small wireless network?
• Which interframe space provides the highest level of priority control over the medium for a short time period?
• Although there are many different implementations of spread spectrum technology, what are the only types specified by the Federal Communications Commission (FCC) in CFR Part 15?
• Which two features were highlighted as part of enterprise gateway capabilities?
• Which statement about 802.11ax (Wi-Fi 6) is true?
• Which component of frequency hopping spread spectrum (FHSS) system creates more overhead than any similar component in a direct sequence spread spectrum (DSSS) system?
• Within EDCA, which category typically has the highest priority for medium access?
• What features are desirable in an AP used to perform WLAN site surveys?
• What is EIRP?
• Which organization regulates the use of WLAN devices in the United States?
• What is the purpose of the IEEE 802.11 WLAN superframe?
• How does RF LOS differ from visual LOS?
• In which scenario is RTS/CTS typically most beneficial?
• What is the purpose of the distributed coordination function (DCF) in an IEEE 802.11 WLAN?
• What technologies does the IEEE 802.11n wireless standard use to achieve data rates as high as 600 Mbps?
• What is the primary purpose of a beacon frame in a WLAN?
• Antenna gain of 10 dBi corresponds to what linear power gain factor?
• To prevent hacker access to passwords and IP addresses, why would you place wireless access points (AP) on switches instead of hubs?
• What is a typical trade-off of using very wide channel bonding?
• Why does the 5 GHz band typically have a shorter range than the 2.4 GHz band?
• Why is direct sequence spread spectrum (DSSS) the most widely known and the most used of the spread spectrum types?
• Which statement about 900 MHz WLANs is supported by the material?
• When should you consider enabling Request to send/clear to send (RTS/CTS) on a WLAN?
• Which test enables the design engineer to understand and control user experience on the WLAN during a site survey?
• Which feature of 802.11ax improves efficiency in dense environments by dividing channels into smaller subcarriers?
• How can filtering augment some of the security limitations of WEP in a WLAN?
• What is the primary function of a wireless access point in an enterprise network?
• What antenna type is ideal for a point-to-point network connection between two office buildings across the street?
• What is OFDM and why is it used in 802.11 standards?
• You wish to build a wireless network that provides significantly better throughput than a single IEEE 802.11b access point. Which of the following is an acceptable solution?
• Which device would a WLAN administrator install between the access point and the network to give indoors users as much bandwidth as possible?
• Which attack involves hijacking clients by broadcasting a stronger AP signal than the legitimate AP?
• Which statement best describes the use of WLANs for building-to-building connectivity?
• Which IEEE wireless standard utilizes the 5 GHz frequency band for its signal transmissions?
• How do MAC addresses participate in securing wireless frames?
• Define RSSI and SNR in wireless terms and explain how they affect link quality.
• What capability was added to residential gateways to connect to IEEE 802.11b-, 802.11g-, 802.11n-, and 802.11ac-compliant devices?
• What is the difference between a Basic Service Set (BSS) and an Extended Service Set (ESS)?
• IEEE 802.11ac devices operate primarily in which band?
• During a WLAN site survey, how should you use a laptop, tablet, or cell phone?
• In enterprise networking, WLANs are typically deployed at which layer to serve end-user connectivity?
• Which statement accurately describes SIFS in relation to other interframe spaces?
• Which device is a half-duplex device that only provides Layer 2 connectivity?
• What initialization vector (IV) length do most weak WEP implementations use?
• During the 802.11 association process, what happens?
• What IPv6 features are commonly used by modern WLANs (e.g., SLAAC and RA) and why?
• Name and briefly describe the main 802.11 frame types used during association and data transfer.
• Which FHSS overhead component is typically larger than any similar component in DSSS?
• After delivering a WLAN site survey report to the customer, what is the ideal next step to ensure informed purchasing and security decisions?
• What causes the hidden node problem in a wireless LAN?
• Which IEEE 802.11 WLAN standard specifies both spread spectrum RF and IR transmission technologies?
• Compare SU-MIMO and MU-MIMO and their impact on capacity.
• Why have 900 MHz ISM WLANs lost favor compared to 2.4 GHz and 5 GHz?
• Which of the following are security best practices for a small wireless network?
• In which of the following applications might a WLAN be deployed in a distribution layer role?
• An omnidirectional antenna radiates RF energy in which pattern?
• What is an SSID and what is its function in a WLAN?
• What does WMM stand for and what role does it play in network performance?
• Which statement accurately contrasts passive and active WLAN scanning methods?
• In a closed system WLAN, which frames do not advertise the network's SSID?
• How might you confirm the presence of a hidden node on the network?
• What is OFDMA in 802.11ax and what problem does it solve?
• How does spread spectrum technology reduce the probability of signal jamming?
• Which medium access protocol do WLANs predominantly rely on for contention-based access?
• What is a slot time in an IEEE 802.11 WLAN?
• Which statement about ESSID is correct?
• What is WPA3-SAE and why is it significant?
• Which sequence represents a basic troubleshooting workflow for a slow Wi‑Fi connection?
• Name two common EAP methods and a brief description.
• What is the most important fact about the SSID when connecting to a WLAN?
• In WLAN terminology, which statement is accurate regarding ESSID and BSSID?
• What is beamforming and in which 802.11 standards is it typically implemented?
• In large WLAN deployments, what is the function of a Wireless LAN Controller?
• What differentiates beacon frames from probe request frames in 802.11 networks?
• Which set of actions constitutes effective interference mitigation for 2.4 GHz networks?
• In a frequency-hopping spread spectrum (FHSS) system that uses 10 frequencies across a 12 megahertz (MHz) frequency band, what happens if narrowband interference occurs at only one of the 10 frequencies?
• Why has it become cost-effective for enterprise companies to integrate WLAN segments into their networks?
• What are the three main conditions that influence the range of a WLAN?
• Which condition occurs when an access point receives a distant client's signal at a lower power level than that of a nearer client?
• Which option best describes NAT in the context of a typical home or small office wireless network?
• What is the purpose of CSMA/CA in wireless networks?
• In infrastructure mode, how do clients communicate with each other on the WLAN?
• How do WPA2/WPA3-PSK and WPA2/WPA3-Enterprise differ in authentication?
• Which management interface is commonly used to configure APs via a browser?
• Which statement describes a passive injector?
• What is the primary function of Network Address Translation (NAT) in a typical wireless LAN?
• What is a beacon interval, and what is its typical default value?
• What does U-NII stand for?
• Which statement best describes the benefit of maintaining attachments in the WLAN survey report?
• In the context of direct sequence spread spectrum, the term 'processing gain' describes the relationship between which two quantities?
• In an RF link, how does cable loss affect EIRP?
• What type of connectivity is needed to connect networks between two buildings located across the street from each other?
• What does the 'on with threshold' setting of the RTS/CTS protocol allow?
• Which frame is involved in establishing association between a client and an AP?
• What is the Association ID in 802.11 association used for?
• In the described RF chain, what is the RF power level at the antenna input after amplification?
• Which WLAN device is described as a half-duplex device with Ethernet switch-like intelligence?
• Which network design choice helps prevent exposure of passwords and IP addresses by limiting broadcast domains?
• Which statement best describes PMK caching and Fast BSS Transition (802.11r) in fast roaming?
• Given an AP with 100 mW of output power connected through a cable with 3 dB of loss to the antenna with a 10 dBi gain, what is the approximate EIRP level from the antenna in mW?
• Which statement best describes the role of an enterprise wireless gateway in a large wireless network?
• With a fixed antenna gain, what happens to EIRP when the power delivered to the antenna is increased?
• What RSSI range is generally considered good for meaningful data rates?
• In passive scanning, what frames advertise the network's SSID to potential clients?
• Compare TKIP and CCMP and indicate which is preferred today.
• In antenna diversity, what is the purpose of sampling two antennas?
• What can be done to increase the coverage area of a WLAN?
• What is the width of direct sequence spread spectrum (DSSS) channels and how far apart are their center frequencies spaced?
• What does the IEEE specify as the maximum allowable power output into the intentional radiator for IEEE 802.11a-, 802.11n-, and 802.11ac-compliant devices operating on the lower U-NII band?
• In link budget planning, how does increasing EIRP affect the practical range?
• What is the typical coverage pattern of a semidirectional antenna?
• Besides transmission power, which factors influence WLAN range?