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To properly maintain and troubleshoot a network, you must first be familiar with basic network concepts such as physical layout, cable types, and protocols The combinations of these factors can be implemented in hundreds of different arrangements The most common types of each are discussed in this section
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A local area network (LAN) is a network that covers a relatively small area, such as a building, home, or an office LANs are defined by three primary characteristics: topology, protocol, and media A typical LAN may share resources such as printers, files, or other resources on the LAN LANs are typically very fast and have become extremely cost effective in most situations An office or home can share a single high-speed laser printer using a LAN and each user would have the perception that they are directly connected to the printer There are two primary types of LAN models used to describe networks: peer-to-peer, and client/server-based
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In a peer-to-peer network all computer systems in the network have equal capabilities and responsibilities; each computer user is responsible for controlling access, sharing resources, and storing data on their computer All of the systems essentially operate both as servers and work systems as shown in Figure 7-1 Security in a peer-to-peer environment is established by the respective computer user There are no central administrative functions or capabilities in this type of network Peer-to-peer networks are usually very effective in environments that are small Microsoft recommends that peer-to-peer networks not exceed ten or so systems in the network This is primarily for administrative convenience because an office with ten systems in a peer-to-peer environment will have ten separate security policies, file sharing, and access permissions This can cause the network management issues to become extremely cumbersome because each machine must be individually configured and managed Many homes with multiple computers are being connected to each other using either wired or wireless LAN technologies These technologies have become very cost effective over the last few years
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A client/server-based environment uses dedicated computers called servers to store data, provide print services, or other capabilities Servers are generally more powerful computer systems with more capacity than a typical workstation Client/server-based models also allow for centralized administration and security These types of networks are also considerably more scalable in that they can grow very large without adding additional administrative complexity to the network A single model for security, access, and file sharing can be established by the network administrator when the network is configured This configuration may remain unchanged as the network grows Client/server environments are also extensively useful in situations where a centralized communications system is needed Servers can be multipurpose, performing a number of functions, or dedicated, as in the case of a web or mail server Figure 7-2 shows a network with servers being used for e-mail, web services, and communications Notice in this situation that each of the servers is dedicated to the task that they are assigned
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FIGURE 7-1
A peer-to-peer network in a home
7:
Basic Networking
FIGURE 7-2
A client/server environment where dedicated or special purpose servers perform assigned functions
The difference between a peer-to-peer network and a client/ server-based network is that in a peer-to-peer network all of the
workstations operate essentially as both workstations and servers In a client/server environment, servers are not used as clients
Topologies
The term network topology refers to the physical layout of computers and other equipment in the network The most commonly used topologies are star, bus, and ring The characteristics, special equipment, and advantages and disadvantages of each are discussed here
Star Topology
Star networks consist of computers that are all attached to a network device called a hub (see Figure 7-3) The hub s job is to receive signals from one computer and relay them to all other attached computers The computer to which a packet is addressed opens and reads the data All other computers attached to the hub ignore the packet Star networks do not always appear like the one in Figure 7-3 when they are implemented It might be inconvenient to place a hub and cables in the middle of an office In most implementations, the hub will be placed on one side of the room, with the cables running under tables or desks to the hub In these cases, the topology doesn t physically resemble a star but is still considered a star topology
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