Given: XYZ Corporation is experiencing connectivity problems with their existing building-to-building bridge link. A concrete wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many frames. The administrator moves the antenna to an area not obstructed by the concrete wall and then realizes the RF cable cannot reach the new location.
If an extension cable is added to move the antenna, what are the likely results?
A. The data throughput rate will increase because VSWR will decrease.
B. The Equivalent Isotropically Radiated Power (EIRP) will decrease.
C. The antenna's azimuth beamwidth will decrease.
D. The size of the Fresnel zone will increase.
E. The likelihood of a direct lightning strike will increase.
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?
A. 802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a OFDM.
B. In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies
C. 802.11a/g devices may support WMM, but all 802.11n devices are required to support WMM.
D. An 802.11g/n AP that is configured to support only OFDM data rates will allow HR/DSSS devices to associate.
E. When HR/DSSS devices are present, HT MCS rates are disabled for the entire BSS.
Given: ABC Hospital is planning a Wi-Fi infrastructure upgrade where the 802.11b/g APs would be replaced with new dual-radio HT (802.11n) 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?
A. Multipath will increase, causing excessive layer-2 retransmissions. The retransmissions will cause latency for VoWiFi handsets.
B. Increased receiver sensitivity on the HT APs will cause them to continually change channels to avoid co-channel interference.
C. If the existing UTP cabling is not Category 6 or better, the total Ethernet backhaul for each AP will be limited to 100 Mbps.
D. In locations with line-of-sight to client devices and little multipath, the benefits of MIMO may be less significant than in other areas.
Given: 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?
A. Client stations would see two different sets of AP capabilities as they roam between APs with the same BSSID.
B. The added range of 802.11n APs would cause additional co-channel interference.
C. The additional beacon material in 802.11n beacons would confuse 802.11b/g client stations.
D. Beacons from 802.11n APs use 40 MHz channels, while beacons from 802.11g APs use 20 MHz channels.
Given:
You were previously on-site at ABC's facility to conduct a pre-deployment RF site survey. The WLAN has
been deployed according to your recommendations and you are on-site again to perform a network
validation.
When performing this type of post-deployment RF site survey for VoWiFi, what are two steps that must be
performed? (Choose two)
A. Coverage analysis to verify appropriate coverage and roaming boundaries
B. Spectrum analysis to locate and identify RF interference sources
C. Hidden node analysis to identify and relocate existing hidden nodes
D. Protocol analysis to discover channel use on neighboring APs
E. Application analysis with an active phone call on a VoWiFi handset
Given: 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?
A. SNMP
B. VRRP
C. RBAC
D. IPSec
E. WIPS
F. WPA2
Given: You are an independent contractor, hired to perform an indoor site survey and network design for ABC Hotel. The network will support both hotel staff and guest users. You are interviewing the network manager to determine business, performance, and security requirements for the future 802.11 WLAN.
What questions should you ask the IT manager? (Choose two)
A. What data cabling is currently installed in the rooms and throughout the hotel?
B. How much RF loss do you expect between hotel rooms?
C. Where are the RF dead zones located within the facility?
D. What types of applications will be used by the hotel staff?
E. Are there any radar systems in use at the hotel that would conflict with the WLAN?
During the discovery and connectivity process, client and AP stations exchange information about their supported data rates. After the association, how do client and AP stations select the supported data rate that will be used to send an 802.11 data frame?
A. During the association, the client and AP agree to use the same transmit rate, but either station can request a change at any time after the association.
B. The client and AP each choose the optimal data rate to use independently of one another, based on their own experience of the RF link.
C. The client and AP may use different transmit rates, but the AP determines the data rate that will be used by each client station in the BSS.
D. The client and AP may use different transmit rates, but the client determines the data rate that it will use and the data rate that the AP will use when communicating to the client.
E. The client and AP may use a different transmit rates, but the transmit rate is determined by the peer station, based on the peer's experience of the RF link.
ABC Company has a 2.4 and 5 GHz WLAN deployment supporting four bands in the 5 GHz range (UNII 1, UNII 2, UNII 2e, and UNII 3). DFS functionality is enabled as required by the regulatory domain. 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 user roams throughout the building. All APs have 2.4 and 5 GHz radios enabled. 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?
A. Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36-48 in UNII 1.
B. 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.
C. The voice client does not support DFS, and therefore experiences some 5 GHz coverage holes as it moves through the network.
D. The client's band selection algorithm prefers 5 GHz, but band steering behavior usually steers 75- 85% of client devices to 2.4 GHz.
When replacing the antenna of a WLAN device with a similar antenna type that has a higher passive gain, what antenna characteristic will decrease?
A. Beamwidth
B. Range
C. Active gain
D. Receive sensitivity
E. Fresnel Zone size
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