CWNA - Dumpy 1 Questions and Answers Graded A+

CWNA - Dumpy 1 Questions and Answers Graded A+ An RF signal sometimes bends as it passes through some material other than free space. What is the term that describes this behavior? Refraction What can an impedance mismatch in the RF cables and connectors cause? Excessive VSWR What factor does not influence the distance at which an RF signal can be effectively received? Receiving station's radio sensitivity A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element? 23 dBM In a long-distance RF link, what statement about Fade Margin is true? Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading. What wireless networking term describes the increase of RF energy in an intentional direction with the use of an antenna? Passive Gain Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation? Patch and Panel What statement about the beamwidth of an RF antenna is true? Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB. Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link? MU-MIMO Capabilities of the bridges What best describes WPA2 in relation to 802.11 wireless networks? WPA2 is the standard that defines security for WLANs. An IEEE 802.11 amendment is in the daft state. What impact does this draft amendment have on the 802.11 standard? No impact: Until an amendment is ratified, it does not become part of the standard. You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2016 standard that was not available before the ratification of 802.11 ac? 144 What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs? OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well. Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS? HT (802.11n) An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop. What WLAN use case is represented? BSS What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS? Implementing Fast BSS Transition (FT) for roaming What ID is typically mapped to an AP's MAC address if a single BSS is implemented? BSSID What is appended to the end of each 802.11 data frame after the payload? FCS (Frame Check Sequence) When an ACK frame is not received by the transmitting STA, what is assumed? The frame was not delivered and must be retransmitted When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond? Each AP responds in turn after preparing a probe response and winning contention. What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment? Shared Key Authentication You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change? 400 ns What statement about the IEEE 802.11-2016 QoS facility is true? 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior? The clients are all 802.11n STAs or lower When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN? VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them. What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses? An IBSS is used instead of a BSS What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS? Signal strength of AP beacons received. Lynne runs a small hotel, and as a value added service for his customers he has implemented a Wi-Fi hotspot. Lynne has read news articles about how hackers wait at hotspots trying to take advantage of unsuspecting users. He wants to avoid this problem at his hotel. What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on his customers' wireless computers? Enable station-to-station traffic blocking by the access points in the hotel. You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy? Wireless bridging When implementing PoE, what role is played by a switch? PSE (Power Sourcing Equipment) A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP? 25.5 W A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs? DHCP (Dynamic Host Configuration Protocol) You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming? FT (Fast Transition) In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping? 2 and 8 The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz). What is the center frequency of channel 4? 2.427 The requirements for a WLAN you are installing state that it must support unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements? VoIP (Voice over Internet Protocol) You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described? SOHO (Small Office/Home Office) Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured? DHCP (Dynamic Host Configuration Protocol) What statement about 802.3, Clause 33 Power over Ethernet is true? The lowest voltage drop is achieved when using CAT6 cable instead of Cat5 or CAT5e. What statement describes the authorization component of a AAA implementation? Granting access to specific network services or resources according to a user profile. 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? Any 802.11 protocol analyzer can see the SSID in clear text in frames other than Beacons frames. This negates any security benefit of trying to hide the SSID in Beacons and Probe Response frames. What cipher suite is specified by the 802.11-2016 standard and is not deprecated? Counter Mode with CBC-MAC Protocol 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 in their department. What WLAN feature would allow the network administrator to accomplish this task? RBAC (Role Based Access Control) 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 authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator? The root bridge You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages used for access point management. What error in administration could be the cause of this security concern? HTTP is in use instead of HTTPS What is the most effective method for testing roaming in relation to 802.11 VoIP handsets? Place a call with the handset and move around the facility to test quality during roaming. You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference? Wi-Fi scanner During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device? Airtime Utilization A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device? Laptop-based spectrum analyzer with a directional antenna You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test? Python You are using a site survey tool for post-implementation validation. You have installed the appropriate adapter driver and imported a floor plan. Now, you want to take the next step in proper tool use. What must you do before gathering survey data after the floor plan is imported? Calibrate the floor plan