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In JDBC, transactions can be managed through the Connection interface using the setAutoCommit, setTransactionalIsolation, commit, and rollback methods. By default, JDBC utilizes autocommit mode, in which every database communication is handled in a separate transaction. To maintain explicit transaction control, a JDBC application must disable autocommit mode, which is done by passing false to the setAutoCommit method in the Connection interface.

2. A host determines that the destination network ID of a packet is the same as its own network ID. What does the host do with the packet a. It broadcasts an ARP request to determine the Media Access Control (MAC) address of the destination host and transmits the packet on the local network. b. It sends the packet to the server, which broadcasts the packet on the local network. c. It sends the packet to the default gateway for delivery. 3. Which of the following is the dotted-decimal notation equivalent of the binary address 11001100 00001010 11001000 00000100 To answer the question, first perform notation conversion manually, and then verify your answer with Calculator. a. 204.18.200.3 b. 204.34.202.4 c. 204.10.200.4 d. 202.10.200.4 4. Which of the following is the binary equivalent of the dotted-decimal address 207.209.68.100 To answer the question, first perform notation conversion manu ally, and then verify your answer with Calculator. a. 11001111 11010001 01000100 01100100 b. 11000111 11010001 01000100 01100100 c. 11001111 11010001 01000100 01101100 d. 11001111 11010001 11001101 01100100 5. Determine the dotted-decimal equivalent of the following address. Use CIDR nota tion to designate the default subnet mask. First perform this notation conversion manually, and then verify your answer with Calculator.

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10010010 01101011 00100111 10001001

In The APM and Compute-Bound Operations section earlier in this chapter, I showed how to use the APM to perform a compute-bound operation . In this section, I show how to do the opposite: use a Task to perform an I/O-bound operation . In the System.Threading.Tasks namespace, there is a class called TaskFactory . This class was discussed in 26 . However, this class offers a FromAsync method, which I did not discuss in 26 . This method accepts four arguments and returns a reference to a Task object . The four arguments are a BeginXxx method, an EndXxx method, an Object state, and an optional TaskCreationOptions10 value . So instead of initiating an asynchronous operation like this:

In this exercise, you perform a Network Monitor capture of name resolution traffic from Computer2 and then compare this capture to one already saved on Computer1. 1. Log on to Computer2 as Administrator. 2. Install Network Monitor on Computer2, as explained in Lesson 1 of 3, Monitoring and Troubleshooting TCP/IP Connections. 3. On Computer2, open Network Monitor. 4. If a message box appears requesting that you specify a network on which to cap ture data, click OK. The Select A Network window opens. 5. Select the adapter associated with your internal local area network (LAN), and then click OK. 6. Click the Start Capture button to begin a network trace. 7. Open a command prompt. The next two steps force Computer2 to contact Computer1 during the name reso lution process.

In ADO.NET, a transaction is initiated via the IDbConnection.BeginTransaction method, which returns an IDbTransaction instance through which all transaction management is performed. Table 16-5 provides a comparison of the classes and methods used to initiate and control transactions in both JDBC and ADO.NET.

WebRequest webRequest = WebRequest.Create("http://Wintellect.com/"); webRequest.BeginGetResponse(result => { WebResponse webResponse = null; try { webResponse = webRequest.EndGetResponse(result); Console.WriteLine("Content length: " + webResponse.ContentLength); } catch (WebException we) { Console.WriteLine("Failed: " + we.GetBaseException().Message); } finally { if (webResponse != null) webResponse.Close(); } }, null);

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you can turn it into a Task, and then use it with the rest of the Task infrastructure like this:

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