Check answers here:
Chapters 17 – 19: Wireless Essentials Exam Answers
Quiz-summary
0 of 33 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
Information
CCNP ENCOR v8 Chapters 17 – 19: Wireless Essentials Test Online
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 33 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Average score |
|
Your score |
|
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- Answered
- Review
-
Question 1 of 33
1. Question
1 pointsWhen comparing two absolute power values, what can a wireless engineer conclude after calculating a result of -3 dB?Correct
Incorrect
Hint
According to the dB laws: Law of 0: If two power levels are the same, one is 0 dB greater than the other. Law of 3s: A value of 3 dB means that the power value of interest is double the reference value. A value of -3 dB means that the power value of interest is half the reference value. Law of 10s: A value of 10 dB means that the power level of interest is 10 times the reference value. A value of -10 dB means that the power level of interest is 1/10th of the reference value. -
Question 2 of 33
2. Question
1 pointsWhile reviewing wireless survey reports, an intern asks a wireless engineer about the term noise floor. What is the definition of noise floor?Correct
Incorrect
Hint
Noise is any other signal that is received on the same frequency as a signal of interest and noise floor is the average signal strength of that received noise. -
Question 3 of 33
3. Question
1 pointsRefer to the exhibit. It displays the sources of A, B, and C and the corresponding absolute power of each. In comparing source A and B , how much greater is the signal strength of source B than the signal strength of source A?Correct
Incorrect
Hint
Source B is double the value of source A. Each time you double a value, simply add 3 dB. Because 10 mW is double 5 mW, source B is 3 dB greater than the strength of source A. -
Question 4 of 33
4. Question
1 pointsWhat is a simple solution to overcome the negative effects of free space path loss?Correct
Incorrect
Hint
Increasing the antenna gain or increasing the transmitter output power can be simple ways to overcome free space path loss. -
Question 5 of 33
5. Question
1 pointsWhat technological factor limits the number of unique spatial streams that can be supported by a MIMO device?Correct
Incorrect
Hint
A MIMO device can distribute spatial streams across multiple radio chains and does not have to assign a unique spatial stream to an individual transmitter/receiver. The number of possible spatial streams depends on the processing capacity and the transmitter feature set of the wireless device. -
Question 6 of 33
6. Question
1 pointsWhich wireless technology allows data to be distributed across two or more radio chains in order to increase data throughput while operating on the same channel?Correct
Incorrect
Hint
Spatial multiplexing allows faster data throughput by multiplexing or distributing data across two or more radio chains operating on the same channel but separated through spatial diversity. -
Question 7 of 33
7. Question
1 pointsWhich term describes the decrease in signal strength of an RF even though there are no obstacles in the path between a transmitter and a receiver?Correct
Incorrect
Hint
Whenever an RF signal is transmitted from an antenna, the signal amplitude decreases as it travels through free space. Even if there are no obstacles in the path between the transmitter and receiver, the signal strength will weaken. This is known as free space path loss. -
Question 8 of 33
8. Question
1 pointsHow does the 802.11ax amendment (Wi-Fi 6) differ from any other 802.11 wireless standard created before it?Correct
Incorrect
Hint
In comparing 802.11ax (Wi-Fi 6) to previous 802.11 implementations, one of the key differences is that 802.11ax can use OFDMA to allocate air time for transmission by multiple devices simultaneously. -
Question 9 of 33
9. Question
1 pointsWhich IEEE standard operates at wireless frequencies in both the 5 GHz and 2.4 GHz ranges?Correct
Incorrect
Hint
The 802.11n standard is backwards compatible with both the 802.11a and 802.11b standards and therefore operates at both 5 GHz and 2.4 GHz. -
Question 10 of 33
10. Question
1 pointsHow does a change in frequency or cycles affect the wavelength of a wireless LAN signal?Correct
Incorrect
Hint
In measuring an RF signal, there is a correlation between frequency and wavelength. As the frequency increases, the wavelength decreases. When there are fewer cycles per second, the wavelength will cover a greater distance. -
Question 11 of 33
11. Question
1 pointsAn engineer has identified two signals that are 180 degrees out of phase . What can be determined about these two signals?Correct
Incorrect
Hint
Signals designated as out of phase do not have matching cycles and are not identical. These signals may cancel each other out as they are received. -
Question 12 of 33
12. Question
1 pointsWhich wireless network topology requires that all of the access points be located within a 100 meter radius of an access switch?Correct
Incorrect
Hint
The embedded wireless network topology employs an embedded WLC within each access layer switch. Each AP would be connected to the access switch via twisted-pair cable and is subject to the 100 meter distance limitation. -
Question 13 of 33
13. Question
1 pointsWhat are two benefits of deploying a centralized wireless LAN topology? (Choose two.)Correct
Incorrect
Hint
A centralized or unified wireless LAN topology utilizes a centralized WLC location that provides easy enforcement of security policies and the ability to maximize the number of APs that can join to it. The centralized topology also supports user mobility because all of the APs associate to the same WLC no matter how many APs the user device associates with while roaming. -
Question 14 of 33
14. Question
1 pointsWhat is a difference between autonomous APs that operate in a home environment and controller-based APs that operate in a corporate environment?Correct
Incorrect
Hint
Autonomous APs are standalone devices that are configured via Cisco CLI or a GUI. Controller-based APs are server-dependent devices that require no initial configuration to operate, because they are automatically configured and managed by a WLAN controller. Most autonomous and controller-based APs support PoE. -
Question 15 of 33
15. Question
1 pointsWhich protocol and port number are used when an AP sends a unicast CAPWAP Discovery Request packet to the IP address of a controller? (Choose two.)Correct
Incorrect
Hint
When attempting to discover a WLC, an access point can send a unicast CAPWAP Discovery Request to the IP address of a controller over UDP port 5246 or can send a broadcast over the local subnet. -
Question 16 of 33
16. Question
1 pointsWhich type of topology supports the use of CAPWAP tunnels without the investment of a dedicated wireless LAN controller?Correct
Incorrect
Hint
A Mobility Express topology uses a fully functional Cisco AP with software acting as a WLC instead of investing in a dedicated WLC device. -
Question 17 of 33
17. Question
1 pointsWhat information is needed by an AP for stateful switchover (SSO) using high availability with a standby WLC?Correct
Incorrect
Hint
The AP will have a single CAPWAP tunnel to the active controller. The active unit keeps CAPWAP tunnels, AP states, client states, configurations, and image files all in sync with the hot standby unit. The active controller also synchronizes the state of each associated client that is in the RUN state with the hot standby controller. -
Question 18 of 33
18. Question
1 pointsWhy would an AP that successfully discovers a WLAN controller be denied from joining that WLC?Correct
Incorrect
Hint
A WLC will deny an AP from joining it if the maximum number of lightweight APs already joined to it has already been reached. -
Question 19 of 33
19. Question
1 pointsWhat type of wireless antenna is best suited for providing coverage in large open spaces, such as hallways or large conference rooms?Correct
Incorrect
Hint
Omnidirectional antennas send the radio signals in a 360 degree pattern around the antenna. This provides coverage to devices situated anywhere around the access point. Dishes, directional, and Yagi antennas focus the radio signals in a single direction, making them less suitable for covering large, open areas. -
Question 20 of 33
20. Question
1 pointsA wireless engineer accesses the WLC and configures a lightweight access point to function as a sniffer. Which two functions will be performed by the lightweight access point in this mode? (Choose two.)Correct
Incorrect
Hint
Once a special mode is activated on a lightweight AP, local mode and the corresponding BSSs will be disabled. A lightweight AP acting as a sniffer will dedicate all of the radios to receiving 802.11 traffic from other sources and forwarding that traffic to a PC that has network analyzer software installed. -
Question 21 of 33
21. Question
1 pointsHow is the beamwidth of a wireless antenna measured on a plot?Correct
Incorrect
Hint
Beamwidth is viewed as a measure of focus for a particular antenna. Beamwidth is determined by finding the strongest point on the plot and following it in either direction until the signal is one-half of the strongest power or 3 dB less. -
Question 22 of 33
22. Question
1 pointsA wireless engineer is troubleshooting signal degradation between two wireless antennas connecting over a distance. If no physical obstructions are found to be blocking the wireless signal, what is most likely the issue?Correct
Incorrect
Hint
In order for two wireless antennas to not suffer from signal degradation, the polarization of the transmitting antenna should match the polarization of the receiving antenna. -
Question 23 of 33
23. Question
1 pointsWhat is the purpose of a wireless client sending a reassociation request to an AP?Correct
Incorrect
Hint
When a client wants to join the BSS of an AP, it actively scans channels and sends probe requests to discover candidate APs. The client then selects one and tries to associate with it. A wireless client can send association request and reassociation request frames to the AP selected. Association requests are used to form a new association, while reassociation requests are used to roam from one AP to another, preserving the original association status of the client. -
Question 24 of 33
24. Question
1 pointsFor its customers, a shopping center is deploying a wireless network that consists of 20 lightweight APs that are bound to a single WLC. Which type of roaming occurs when clients roam between APs on the shopping center network?Correct
Incorrect
Hint
When a wireless client is roaming among APs that are bound to the same WLC controller, the roam occurs entirely within the controller. This is known as intracontroller roaming. Intercontroller roaming occurs when a client is roaming among APs that are bound to different WLC controllers. Layer 2 roaming is a type of the intercontroller roaming. -
Question 25 of 33
25. Question
1 pointsA company deploys a Cisco wireless network over a large campus. The wireless network uses lightweight APs and multiple WLCs. A network technician walks around the campus to verify that wireless clients can roam smoothly between APs bound to different WLCs and assigned different VLANs and IP subnets. The technician verifies that while the client roams around campus, the client retains the same VLAN and IP address assigned. Which roaming scenario is the technician verifying?Correct
Incorrect
Hint
In a Cisco wireless network, when a client initiates an intercontroller roam, the two controllers involved can compare the VLAN numbers that are assigned to the respective WLAN interfaces. If the VLAN IDs are the same, the client undergoes a Layer 2 intercontroller roam (also called local-to-local roam) and can continue to use the original IP address on the new controller. If the two VLAN IDs differ, the controllers arrange a Layer 3 roam that will allow the client to keep using the same IP address. -
Question 26 of 33
26. Question
1 pointsA company deploys a Cisco wireless network over the campus. Wireless network access is needed for visitors to access the internet while on campus. What are two best practices in setting up APs and WLCs for secure wireless connections for visitors? (Choose two.)Correct
Incorrect
Hint
In Layer 3 roaming, anchor and foreign controllers are normally determined automatically. When a client first associates with an AP and a controller, that controller becomes its anchor controller. When the client roams to a different controller, that controller can take on the foreign role. However, sometimes it is desirable to control which WLC to be the anchor controller. For example, guest users should not be allowed to associate with just any controller in the network. Guests might be forced onto a specific controller that is situated behind a firewall or contained in a protected environment. This objective can be achieved by configuring one controller to be a static anchor for a WLAN so that other controllers will direct clients toward it through Layer 3 roaming tunnels. -
Question 27 of 33
27. Question
1 pointsWhat is a difficulty in locating a wireless client based on the RSS value when received by only one AP?Correct
Incorrect
Hint
To improve the accuracy of locating a device, an AP can use the received signal strength (RSS) of a client device as a measure of the distance between the two. However, if the distance is measured from a single AP only, it is difficult to determine where the client is situated in relation to the AP. In the case of an indoor AP with an omnidirectional antenna, the client could be located anywhere along a circular path of fixed distance because the received signal strength would be consistent at all points on the circle. -
Question 28 of 33
28. Question
1 pointsWhich two Cisco location solutions can work with Cisco management platforms to provide real-time location services for a wireless network? (Choose two.)Correct
Incorrect
Hint
Cisco APs and WLCs can integrate with management platforms like Cisco Prime Infrastructure or DNA Center, along with location servers like Cisco Mobility Services Engine (MSE), Cisco Connected Mobile Experiences (CMX), or Cisco DNA Spaces to gather location information in real time and present that information in a relevant way. -
Question 29 of 33
29. Question
1 pointsWhat is a Cisco solution developed to improve the results of wireless device location based on RSS values received by multiple APs?Correct
Incorrect
Hint
The Cisco approach to improve the results of wireless device location based on RSS values received by multiple APs is to implement RF fingerprinting, where each mapped area is influenced by an RF calibration template that more closely resembles the actual signal attenuation experienced by the APs and clients. -
Question 30 of 33
30. Question
1 pointsWhich tunneling technology is used to facilitate data exchange between a lightweight AP and a WLAN controller?Correct
Incorrect
Hint
In a lightweight AP topology, APs are bound to wireless LAN controllers through CAPWAP tunnels. -
Question 31 of 33
31. Question
1 pointsWhich technique is used by Cisco WLCs to minimize the time required on key exchanges during roaming by maintaining a database of clients and keys on behalf of bound APs, and providing those clients and keys to other controllers and bound APs as needed during roaming?Correct
Incorrect
Hint
Cisco controllers offer three techniques to minimize the time and effort spent on key exchanges during roams:- Cisco Centralized Key Management ( CCKM ): One controller maintains a database of clients and keys on behalf of bound APs and provides the clients and keys to other controllers and bound APs as needed during client roams.
- Key caching : Each client maintains a list of keys used with prior AP associations and presents the keys as it roams.
- 802.11r : This 802.11 amendment addresses fast roaming or fast BSS transition. A client can cache a portion of the key of the authentication server and present that to future APs as it roams.
-
Question 32 of 33
32. Question
1 pointsHow is wireless client location determined based on RSS values when using three or more APs?Correct
Incorrect
Hint
To locate a device more accurately, an AP can use the received signal strength (RSS) of a client device as a measure of the distance between the two. However, if the distance is measured from a single AP only, it is difficult to determine where the client is situated in relation to the AP. A better solution is to obtain the same measurement from three or more APs, then correlate the results and determine where they intersect. -
Question 33 of 33
33. Question
1 pointsWhat technology does a Cisco WLC use to provide Layer 3 roaming to a wireless client?Correct
Incorrect
Hint
A Layer 3 intercontroller roam consists of an extra CAPWAP tunnel that is built between the original controller with which the client associated (called the anchor controller) and the controller it has roamed to (called the foreign controller). The tunnel carries data to and from the client as if it is still associated with the original controller and IP subnet.