winforms ean 13 Planning a Network Topology in VB.NET

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Planning a Network Topology
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Application The application layer provides the interface between the network ing protocol stack and the software running on the computer. For example, this layer provides the interface for e-mail, file transfers, Telnet and File Transfer Pro tocol (FTP) applications. Applications use the services provided by applicationlayer protocols, which in turn use the services provided by the other layers beneath them.
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It is important to understand that the protocols that implement the functions of the OSI model do not correspond exactly to the individual layers. A computer on a network does not necessarily run seven different protocols, with one corresponding to each layer. Generally speaking, the designer of a network infrastructure selects a data-link layer protocol, such as Ethernet or Token Ring, which actually encompasses both the physical and data-link layers in its functions, and a protocol suite, such as TCP/IP, which implements the functions of the network and transport layers. The session, pre sentation, and application-layer functions are sometimes provided by a protocol in the suite or by a separate application-layer protocol.
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Selecting a Data-Link Layer Protocol
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The selection of a data-link layer protocol is the most important decision in the design of the network s physical infrastructure. The data-link layer protocol is not only respon sible for strictly data-link layer functions, such as media access control, but also for the network s physical layer implementation. Currently, the most commonly used data-link layer protocol on networks is Ethernet, with Token Ring running a distant second. However, there are several Ethernet variations that provide various levels of perfor mance, and selecting the correct one is crucial. You need to consider a number of criteria when selecting the data-link layer protocol for use on a network. Because the data-link layer protocol dictates the nature of the network s physical infrastructure, you must consider design elements such as the dis tance between workstations and the transmission speed you require. You must also consider the nature of the traffic the network will carry and its amount. Additionally, your budget is always an important consideration.
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Although there have been other types of media used in the past, most LANs con structed today use either unshielded twisted pair (UTP) cable or fiber-optic cable. In most cases, UTP cable is sufficient and much less expensive, but fiber-optic cable pro vides a viable alternative when you have special performance requirements. Network media that consist of cables are called bounded media. Recent developments in wireless LAN technologies have also made unbounded media (networks that don t use cables) a viable and practical solution.
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Lesson 2
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1-15
Unshielded Twisted Pair UTP is a type of copper cable that consists of four pairs of wires, each of which is twisted together and contained inside a protective sheath. The quality of a particular UTP cable is specified by its category rating. Category 5 (or CAT5) UTP is the most commonly used today, although there are higher grades available for special applications (such as 1000Base-T Gigabit Ethernet networks). The con nectors on UTP cables are called RJ-45 and are similar in appearance to telephone cable connectors, except that they have eight pins instead of four. UTP is one of the cable types supported by all forms of Ethernet and by Token Ring as well. As a network medium, it is the most cost-efficient selection because it is the same type of cable used by telephone networks. In new construction, it is common for the same contractor to install both the telephone and data network cables at the same time. You install UTP cable using a star topology, in which you connect each workstation on the network to a central hub (or repeater), as shown in Figure 1-2. You can then con nect hubs to create a larger and more complex network. On an Ethernet network, UTP cable supports distances of up to 100 meters between each workstation and the hub. For most LAN installations, this is more than enough. If greater distances are required, you can modify the location of the hub in your network design or consider using fiberoptic cable, which can span longer distances.
Figure 1-2
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