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NEW QUESTION: 1
A. Apply the async modifier to the method signature.
B. Create a TaskCompletionSource<T> object.
C. Apply the following attribute to the method signature: [MethodImpl(MethodImplOptions.Synchronized)]
D. Call the component by using the TaskFactory.FromAsync() method.
Answer: B,D
Explanation:
A: TaskFactory.FromAsync Method
Creates a Task that represents a pair of begin and end methods that conform to the
Asynchronous Programming Model pattern. Overloaded.
Example:
TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>)
Creates a Task that executes an end method action when a specified IAsyncResult
completes.
B: In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource.
Note:
* System.Threading.Tasks.Task Represents an asynchronous operation.
NEW QUESTION: 2
Which memchanism incorporates the channel capacity into the CAC determination and gives a much more accurate assessment of the current call carrying capacity of the AP?
A. Metrics collection.
B. Expedited bandwidth.
C. Admission control.
D. Max RF bandwidth (%).
E. Reserved roaming bandwidth(%).
F. Load-based AC.
G. Static CAC.
Answer: F
Explanation:
AP Call Capacity
A key part of the planning process for a VoWLAN deployment is to plan the number of simultaneous voice streams per AP. When planning the voice stream capacity of the AP, consider the following points:
Note: A call between two phones associated to the same AP counts as two active voice streams.
The actual number of voice streams a channel can support is highly dependent on a number of issues, including environmental factors and client compliance to WMM and the
Cisco Compatible Extension specifications. Figure 9-11 shows the Cisco Compatible
Extension specifications that are most beneficial to call quality and channel capacity.
Simulations indicate that a 5 GHz channel can support 14-18 calls. This means a coverage cell can include 20 APs, each operating on different channels, with each channel supporting 14 voice streams. The coverage cell can support 280 calls. The number of voice streams supported on a channel with 802.11b clients is 7; therefore, the coverage cell with three APs on the three non-overlapping channels supports 21 voice streams.
Figure 9-11 Cisco Compatible Extension VoWLAN Features
Call Admission Control (CAC) also benefits call quality and can create bandwidth reservation for E911 and roaming calls.
The 802.11e, WMM, and Cisco Compatible Extension specifications help balance and prevent the overloading of a cell with voice streams. CAC determines whether there is enough channel capacity to start a call; if not, the phone may scan for another channel.
The primary benefit of U-ASPD is the preservation of WLAN client power by allowing the transmission of frames from the WLAN client to trigger the forwarding of client data frames that are being buffered at the AP for power saving purposes. The Neighbor List option provides the phone with a list that includes channel numbers and channel capacity of neighboring APs. This is done to improve call quality, provide faster roams, and improve battery life.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/emob41dg/emob41dg- wrapper/preface41.html
Understanding Static CAC
As mentioned previously, there are two types of Admissions Control. Static CAC is based on a percentage of the total Medium Times available and is measure in increments of 32 microseconds. In this section, we will cover how to configure Static and Load-Based CAC and also how to debug it.
http://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan
_troubleshoot/5_Troubleshooting_CAC_Rev1-2.html
Load-Based CAC on the other hand is significantly more difficult to debug. LBCAC is dynamic with regard to the algorithm used to decrement Medium Times from the total that is available. LBCAC takes into consideration different metrics, such as load, Co-channel interference, SNR, etc. and will therefore yield different results when tested. From our experience, it is very difficult to yield consistent results as RF fluctuates and changes within the given environment. Results tend to vary from one cell area to another and even in cell areas that yield the same signal strength.
http://www.cisco.com/c/en/us/td/docs/wireless/controller/4-1/configuration/guide/ccfig41/c
41ccfg.html
o enable video CAC for this radio band, check the Admission Control (ACM) check box.
The default value is disabled.
n the Reserved Roaming Bandwidth field, enter the percentage of maximum allocated bandwidth reserved for roaming video clients. The controller reserves this much bandwidth from the maximum allocated bandwidth for roaming video clients.
Range: 0 to 25%
Default: 0%
in the Reserved Roaming Bandwidth field, enter the percentage of maximum allocated bandwidth reserved for roaming voice clients. The controller reserves this much bandwidth from the maximum allocated bandwidth for roaming voice clients.
Range: 0 to 25%
Default: 6%
To enable expedited bandwidth requests, check the Expedited Bandwidth check box.
The default value is disabled.
To enable TSM, check the Metrics Collection check box. The default value is disabled.
Traffic stream metrics (TSM) can be used to monitor and report issues with voice quality.
In the Max RF Bandwidth field, enter the percentage of the maximum bandwidth allocated to clients for voice applications on this radio band. Once the client reaches the value specified, the access point rejects new calls on this radio band.
Range: 40 to 85%
Default: 75%
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/vowlan/41dg/vow lan41dg
-book/vowlan_ch8.pdfQUESTION NO:
NEW QUESTION: 3
A. Option B
B. Option A
C. Option D
D. Option C
Answer: A,B
Explanation:
* Regex.Matches Searches an input string for all occurrences of a regular expression and returns all the matches.
*MatchCollection
Represents the set of successful matches found by iteratively applying a regular
expression pattern to the input string.
The collection is immutable (read-only) and has no public constructor. The Regex.Matches
method returns a MatchCollection object.
*List<T>.Add Method
Adds an object to the end of the List<T>.
