CWNA-106 Certified Wireless Network Administrator Exam Set 2

XYZ Company has decided to install an 802.11 WLAN system that will support 1000 wireless users, but they are concerned about network security. XYZ is interested in deploying standardized security features. In addition to WPA2-Enterprise with PEAP and role-based access control, XYZ would like to support management frame protection as well as a fast secure roaming protocol for future mobile handsets.As XYZ Company selects a product to deploy, what two IEEE amendments, which are included in 802.11-2012, should be supported to provide the management frame protection and fast secure roaming security features?


Options are :

  • 802.11j and 802.11k
  • 802.11z and 802.11w
  • 802.11r and 802.11k
  • 802.11r and 802.11w

Answer : 802.11r and 802.11w

You are using a tool that allows you to see signal strength for all APs in the area with a visual representation. It shows you SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available. What kind of application is described?


Options are :

  • Site survey utility
  • WLAN discovery tool
  • Protocol analyzer
  • Spectrum analyzer

Answer : WLAN discovery tool

PW0-104 Wireless LAN Administration Practice Exam Set 2

To ease user complexity, your company has implemented a single SSID for all employees. However, the network administrator needs a way to control the network resources that can be accessed by each employee based on their department.What WLAN feature would allow the network administrator to accomplish this task?


Options are :

  • SNMP
  • VRRP
  • RBAC
  • IPSec

Answer : RBAC

ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge uthentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?


Options are :

  • A designated non-root bridge
  • The RADIUS server
  • All non-root bridges
  • The root bridge

Answer : The root bridge

What three cipher suites are specified by the IEEE 802.11-2012 standard? (Choose 3)


Options are :

  • Wired Equivalent Privacy
  • Wi-Fi Protected Access v1 and v2
  • Counter Modewith CBC-MAC Protocol
  • Temporal Key Integrity Protocol

Answer : Wired Equivalent Privacy Counter Modewith CBC-MAC Protocol Temporal Key Integrity Protocol

PW0-071 Certified Wireless Technology Specialist Sales Exam Set 2

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)


Options are :

  • Client stations broadcasting with too much power
  • Obstacles between client stations causing attenuation
  • Data frames too large for the physical environment
  • Large 802.11 cells with physically distributed stations
  • Access points broadcasting with too little power
  • Client stations too close in proximity to each other

Answer : Obstacles between client stations causing attenuation Large 802.11 cells with physically distributed stations

Which features are incorporated in the 802.11-2012 specification and are recommend for robust WLAN client security? (Choose 2)


Options are :

  • SSID hiding
  • CAPWAP with DTLS
  • 802.1X/EAP
  • CCMP cipher suite

Answer : 802.1X/EAP CCMP cipher suite

What WLAN system feature is required to produce a scenario with the following configuration on a single access point? (Choose 2) 1. SSID = Guest / BSSID = AA:AA:AA:AA:AA:AA / VLAN = 22 / Subnet = 192.168.22.0 / RF Channel = 6 2. SSID = Corporate / BSSID = BB:BB:BB:BB:BB:BB /VLAN = 33 / Subnet = 192.168.33.0 / RF Channel = 6 / User Type A 3. SSID = Corporate / BSSID = BB:BB:BB:BB:BB:BB /VLAN = 44 / Subnet = 192.168.44.0 / RF Channel = 6 / User Type B


Options are :

  • Access Categories
  • Call Admission Control
  • User-based authentication
  • Virtual Cell with SCA
  • Multiple WLAN Profiles

Answer : User-based authentication Multiple WLAN Profiles

PW0-270 Certified Wireless Analysis Professional (CWAP) Exam Set 4

What problems may exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? (Choose 2)


Options are :

  • WLAN client stations can experience the hidden node problem when located near each other within the same cell.
  • Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance.
  • Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.
  • The mismatched power between WLAN client stations and APs violates regulatory and IEEE signal quality requirements.

Answer : Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance. Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.

What statements describe industry practices for communication protocols between WLAN controllers and controller-based APs? (Choose 2)


Options are :

  • All vendors support at least one L2 or L3 broadcastprotocol for controller discovery by controller-based APs.
  • For most vendors, the controller-based APs maintain data and control tunnels with at least two controllers for immediate failover and redundancy.
  • All vendors use the same protocol so that APs will interoperate with WLAN controllers from other vendors.
  • Some vendors use proprietary protocols, and some vendorsuse protocols based on public standards like RFCs.

Answer : All vendors support at least one L2 or L3 broadcastprotocol for controller discovery by controller-based APs. Some vendors use proprietary protocols, and some vendorsuse protocols based on public standards like RFCs.

ABC Hospital is planning a Wi-Fi infrastructure upgrade where the 802.11b/g APs (HR/DSSS and ERP) would be replaced with new dual-radio 802.11n/802.11ac (HT and VHT) APs. ABC wants to minimize the time and cost associated with performing a new site survey, so they will be mounting all of the new APs in the same locations and with the same cable drops as the existing APs.What is one performance drawback with this deployment method?


Options are :

  • If the existing UTP cabling is not Category 3 or better, the total Ethernet backhaul for each AP will be limited to 100 Mbps.
  • Increased receiver sensitivity on theVHT APs will cause them to continually change channels to avoid co-channel interference.
  • Multipath will increase, causing excessive layer-2 retransmissions. The retransmissions will cause latency for VoWiFi handsets.
  • The existing WLAN plan, including the AP locations, may not provide the benefits seen in HT and VHT 802.11 PHY capabilities.

Answer : The existing WLAN plan, including the AP locations, may not provide the benefits seen in HT and VHT 802.11 PHY capabilities.

PW0-104 Wireless LAN Administration Certified Practice Exam Set 4

When planning an access point deployment that utilizes Power over Ethernet (PoE) switches at the network edge, what design decision could adversely affect the operation of 802.3-2012, Clause 33 APs?


Options are :

  • A gigabit Ethernet switch port supporting an 802.11a/g AP auto-negotiates to 100 Mbps.
  • Some APs are connected to a PoE switch and are also receiving power from an AC outlet.
  • The Ethernet switch uplink ports are not connected to an 802.3-2012, Clause 33- compliant core or distribution Ethernet switch.
  • All ports on the Ethernet switch will be supporting Class 3 PoE powered devices.

Answer : All ports on the Ethernet switch will be supporting Class 3 PoE powered devices.

How is throughput capacity scaled in a single channel architecture (SCA) WLAN system?


Options are :

  • By adding more SSIDs to existing APs to spread users across different contention domains.
  • By increasing transmit power and placing APs that are on a single channel farther from one another.
  • By using downlink data compression and uplink flow control at the AP.
  • By adding non-overlapping channel layers through the addition of more APs.

Answer : By adding non-overlapping channel layers through the addition of more APs.

Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 & 6).What deployment flaw could cause this problem? (Choose 2)


Options are :

  • The access points are mounted too closely to one another.
  • Reflective objects in the area are causing significant multipath.
  • The output power on the access points is too high.
  • A client station is usingactive scanning to probe for access points on multiple channels.

Answer : The access points are mounted too closely to one another. The output power on the access points is too high.

PW0-270 Certified Wireless Analysis Professional (CWAP) Exam Set 6

You have been sent as a consultant to a customer site that is experiencing problems with some 2.4 GHz clients on their 802.11a/g/n/ac network. After collecting information from the company about the problem, your initial troubleshooting step is to find a client device experiencing performance problems and observe its 802.11 frame exchanges in a protocol analyzer. The retransmission rate for that client is 65% instead of the company’s baseline, which is 9%.Based on this information, what troubleshooting step should follow to isolate the problem?


Options are :

  • Check theframe decodes in the protocol analyzer and look for an excessive number of deauthentication frames.
  • Evaluate the client’s operating frequency band with a spectrum analyzer, looking for a high noise floor or interference sources.
  • Utilize a laptop-based site survey and planning tool to create a predictive model of the optimal AP placement in the customer’s facility.
  • With a protocol analyzer, identify the client’s roaming threshold settings and reassociation behavior.

Answer : Evaluate the client’s operating frequency band with a spectrum analyzer, looking for a high noise floor or interference sources.

What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?


Options are :

  • Military radar
  • Wireless video camera
  • Microwave oven
  • Properly configured AP

Answer : Microwave oven

What statement about 802.3-2012, Clause 33 Power over Ethernet is true?


Options are :

  • Up to 30 watts of power may be provided through an Ethernet cable.
  • When using CAT5 cabling, you decrease the maximum draw available to the PD.
  • Only endpoint PSEs are supported.
  • By using CAT3 cabling, you can increase the maximum draw available to the PD.

Answer : Up to 30 watts of power may be provided through an Ethernet cable.

PW0-104 Wireless LAN Administration Certified Practice Exam Set 2

ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the regulatory domain and APs use DFS channels as long as radar is not detected. Band steering is also enabled to encourage dual-band clients to use frequency bands with more capacity.Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios enabled with transmit power adjusted to accommodate relatively similar cell sizes.This “band hopping” behavior is viewed by network staff to be undesirable. What is the most likely cause of the unpredictable client band selection behavior?


Options are :

  • The voice client does not support DFS, and therefore experiences some 5 GHz coverage holesas it moves through the network.
  • Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36-48.
  • 5 GHz frequencies offer better RF penetration than 2.4 GHz, but 2.4 GHz offers more voice call capacity and lower latency than 5 GHz.
  • The client’s band selection algorithm prefers 5 GHz, but band steering behavior usually steers 75-85% of client devices to 2.4 GHz.

Answer : The voice client does not support DFS, and therefore experiences some 5 GHz coverage holesas it moves through the network.

What problems may occur when there are hidden nodes in the BSS?


Options are :

  • Increase in downlink (transmitted by AP) frame retries.
  • Use of frame fragmentation with fragment bursts.
  • Excessive use of null data frames.
  • High retransmission count for a subset of client stations.

Answer : High retransmission count for a subset of client stations.

In a single channel architecture (SCA) WLAN system, 802.11n (HT) APs should not share an SSID with 802.11g (ERP) APs.What is the reason for this recommendation?


Options are :

  • The additional beacon material in 802.11n beacons would confuse 802.11b/g client stations.
  • Beacons from 802.11n APs use 40 MHz channels, while beacons from 802.11g APs use 20 MHz channels.
  • Client stations would see two different sets of AP capabilities as they roam between APs with the same BSSID.
  • The added range of 802.11n APs would cause additional co-channel interference.

Answer : Client stations would see two different sets of AP capabilities as they roam between APs with the same BSSID.

CWNA-106 Certified Wireless Network Administrator Exam Set 4

As a consultant, you’ve been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability. What information should be considered to help them choose the right WLAN client devices?


Options are :

  • 802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a OFDM
  • In order toearn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies
  • 802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.
  • 802.11ac is not backwardly compatible with 802.11n or 802.11a

Answer : 802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.

PW0-071 Certified Wireless Technology Specialist Sales Exam Set 2

Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility of both OFDM and HR/DSSS? (Choose 2)


Options are :

  • HR/DSSS (802.11b)
  • OFDM (802.11a)
  • ERP (802.11g)
  • HT (802.11n)

Answer : ERP (802.11g) HT (802.11n)

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802.11 WLANs?


Options are :

  • 802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.
  • 802.11a and 11n use six (6) “pilot” subcarriers as a reference for the receiver to detect frequency and phase shifts of the signal.
  • 802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantlyover 64-QAM available in HT-OFDM.
  • With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding rates.

Answer : 802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantlyover 64-QAM available in HT-OFDM.

What answers correctly complete the following sentence?____________ and ____________ carrier sense functions are used to determine if the wireless medium is busy. (Choose 2)


Options are :

  • Virtual
  • Pseudo-random
  • Physical
  • Active
  • Backoff

Answer : Virtual Physical

PW0-105 Certified Wireless Network Administrator CWNA Exam Set 2

What features were introduced in the IEEE 802.11h amendment in order to uphold regulatory requirements for 5 GHz operation? (Choose 2)


Options are :

  • Distributed Coordination Function (DCF)
  • Radio Resource Management (RRM)
  • Dynamic Frequency Selection (DFS)
  • Phase Shift Keying (PSK)
  • Transmit Power Control (TPC)
  • 256-QAM

Answer : Radio Resource Management (RRM) Transmit Power Control (TPC)

In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latency-sensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?


Options are :

  • The current AP is using channel 1 and the new AP is using channel 40.
  • The current AP supports only HT and the new AP is VHT capable.
  • The SSID of the current AP does not match the SSID of the new AP.
  • The access points are hiding the SSID in Beacons and Probe Response frames.

Answer : The SSID of the current AP does not match the SSID of the new AP.

What factors 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)


Options are :

  • Increasing or decreasing the number ofspatial streams in use by the client station and AP
  • Increasing the beacon interval from 100 to 200 (TUs)
  • RF interference from more than 10 nearby Bluetooth transmitters
  • Use of WEP or TKIP for encryption instead of CCMP
  • Use of passphrase authentication instead of 802.1X/EAP authentication

Answer : Increasing or decreasing the number ofspatial streams in use by the client station and AP RF interference from more than 10 nearby Bluetooth transmitters Use of WEP or TKIP for encryption instead of CCMP

PW0-104 Wireless LAN Administration Certified Practice Exam Set 1

In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping? (Choose 2)


Options are :

  • Channels 2 and 8
  • Channels 1 and 5
  • Channels 5 and 10
  • Channels 3 and 7

Answer : Channels 2 and 8 Channels 5 and 10

When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?


Options are :

  • Each AP responds in turn after preparing a probe response and winning contention
  • Each AP checks with the DHCP server to see if it can respond and then acts accordingly
  • For each probe request frame, only one AP may reply with a probe response
  • After waiting a SIFS, a designated AP sends an ACK, and then replies with a probe response.
  • After waiting a SIFS, all APs reply at the same time with a probe response.

Answer : Each AP responds in turn after preparing a probe response and winning contention

Which data rate is supported by 802.11g radios that is not supported by 802.11a radios?


Options are :

  • 54 Mbps
  • 12 Mbps
  • 11 Mbps
  • 9 Mbps

Answer : 11 Mbps

PW0-105 Certified Wireless Network Administrator Exam Set 1

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