Section 6.docx

# Extranet an extranet is a private network that uses

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Extranet An extranet is a private network that uses Internet technologies, but its resources are made available to external (but trusted) users. For example, you might create a website on a private network that only users from a partner company can access. Network Topologies 0:00-0:10 In this lesson, we're going to discuss the network topology. A topology is a graphical depiction of the layout of a computer network. Physical and Logical Topology 0:11-0:42 There are two different types of topologies. The physical topology describes the layout of the network or how devices are connected. The logical topology describes how devices communicate with each other or how data is transmitted on the network. It's important to know the difference between the physical and logical topology because different types of networks may use one type of physical topology, but use an entirely different logical topology. The physical topology refers to the way a computer network is physically wired. There are different types of physical topologies. Bus Topology 0:43-0:47 A bus topology is created when the computers are all connected to a single cable. Ring Topology 0:48-2:09 A ring topology is created when one computer is connected to another, and then another, until they form a ring. Think of the physical topology like the roads in a city. If we were to look at a map of a city, we could see all the interconnecting roads. This is the physical topology of the roads of in our city.Each road connects different buildings to different parts of the city much in the same way cables connect devices to each other on a network. The physical topology doesn't necessarily dictate how data is transferred between computers. The way data is transferred is dictated by the logical topology of the network. Consider this house on this map. This is the street that connects to our house. This is also known as the physical topology. The logical topology dictates how data is transferred on the physical topology. By way of analogy, the logical topology is similar to the traffic laws that dictate howtraffic flows on a physical road. Suppose these streets are one-way streets. Right here are traffic lights. Over here is a road block. These components make up the logical topology of our map. They control how cars can drive on the roads. With a network, the logical topology describes how the data travels on the network from source to destination. This means two different networks could have the same physical topology, but have completely different logical topologies.

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Star topology 2:10-2:43 For example, suppose we have two networks that share the same physical topology. This is known as a star topology all the devices connect to a central connecting point. This network could have a logicaltopology that functions in the same way that a bus topology functions. Its physical topology is a star topology, but its logical topology is a bus topology. By way of contrast, this network could have a logical topology that functions as a star topology. In this case, both the physical and logical topologies are star topologies.
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• Spring '14
• Computer network, Local area network, Network topology, Metropolitan area network

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