1: Windows XP Networking in Visual C#

Creator PDF 417 in Visual C# 1: Windows XP Networking

3
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and choose Properties. On the Security tab, shown in Figure 3-5, select Typical; then select Require Secured Password from the Validate My Identity As Follows list. Finally, select Require Data Encryption (Disconnect If None) and click OK.
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Figure 3-5. Select these options to require encryption and a secure password for your DCC connection.
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1: Windows XP Networking
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Part 1: Windows XP Networking
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Ethernet Networks
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Ethernet is a networking standard that has been around since the mid 1970s when Xerox introduced the first Ethernet product. Ethernet is a network standard that is defined by the Institute of Electrical and Electronics Engineers (IEEE) 802.3 specification. It has been and continues to be overwhelmingly popular. In fact, most home and small office networks are Ethernet networks, and the vast majority of larger networks use Ethernet as well. For this reason, most NICs and networking equipment, except for more specialized networks like HomePNA and wireless, use the Ethernet standard. Even wireless networks use a form of Ethernet. When you set out to connect a group of computers using NICs, a hub, and RJ-45 cables, you are creating an Ethernet network. So, what is Ethernet exactly Ethernet is a set of specifications that define how the hardware used to create a network communicates and functions. For this reason, you can use network adapter cards created by different manufacturers and even a network hub created by yet another manufacturer, and all of the components will work together. Manufacturers adhere to the Ethernet 802.3 specification so that you can mix and match hardware without problems. If you want to read about the 802.3 specification, you can find it using a quick search on the Internet, but the rest of this section highlights the pertinent information. In fact, you ll find a few terms and concepts that you might also see listed on manufacturers Ethernet documentation and packaging.
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How Ethernet Sends Data
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The 802.3 specification defines how data must be sent over an Ethernet network. Ethernet breaks data into small pieces called frames. Each frame contains between 46 and 1500 bytes of data. When you send data over an Ethernet network, the data is broken down into frames, sent over the wire, and then reassembled by the receiving computer. Each frame contains header information noting the beginning of the frame, where it is coming from, and where the frame is going. Additionally, each frame has a component called a cyclical redundancy check (CRC). The CRC allows the receiving computer to check the frame to make sure that the data in the frame has arrived intact. If it has not, the receiving computer can use the header information to request that the sending computer resend the data. This frame-sending format has been used for years and is highly reliable. Ethernet is considered a bus topology, which refers to the shared physical layout of the network. More commonly, Ethernet is called a star-bus topology because all computers radiate from a central hub that resembles a star pattern, as shown in the following illustration.
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1: Windows XP Networking
3: Creating Network Connections
Ethernet Star-Bus Topology
Access Method
Ethernet networks use the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method to send data over the network and manage transmission problems. (In fact, if you have been studying residential gateways and related products, you might have noticed that the CSMA/CD method appears on the products specification sheets.) CSMA/CD does not need to be configured it just tells you that the device fully supports Ethernet s mechanism for sending data. CSMA/CD uses a method where computers listen to the network cable to see if any other computers are transmitting frames. If not, the computer sends the data. If there is traffic, the computer waits until the line is clear. In the event that two computers transmit data on the wire at the same time, a collision will occur. In this case, the data is destroyed. However, the Collision Detection feature of CSMA/CD enables the computers to detect the collision so that data can be resent.
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