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This section will discuss the different network architectures that are popular in today s networking environments This section is very important from an exam point of view as well, so be sure to understand how the different architectures are pieced together
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Basic Network Concepts
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Before we can discuss the different network architectures, we need to start our discussions by defining two terms: broadband and baseband transmissions
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There are two different techniques that may be used to transmit the signal along the network wire baseband communication and broadband communication Let s take a look at each of these techniques
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n Baseband
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Sends digital signals through the media as a single channel that uses the entire bandwidth of the media The signal is delivered as a pulse of electricity or light, depending on the type of cabling being used Baseband communication is also bidirectional, which means that the same channel can be used to send and receive signals Sends information in the form of an analog signal, which flows as electromagnetic waves or optical waves Each transmission is assigned to a portion of the bandwidth, so unlike with baseband communication, it is possible to have multiple transmissions at the same time, with each transmission being assigned its own channel or frequency Broadband communication is unidirectional, so in order to send and receive, two pathways will need to be used This can be accomplished either by assigning a frequency for sending and assigning a frequency for receiving along the same cable or by using two cables, one for sending and one for receiving
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n Broadband
ethernet
To start us out, I first want to point out that network architecture is something that came about one day when someone sat down and said, We are going to design a network architecture; let s use CAT 3 cabling, a star topology, and CSMA/CD as an access method Oh, and let s call this architecture 10BaseT! In this example, 10BaseT was the name assigned to the architecture because 10 Mbps is the transfer rate of the network, baseband communication is the technique used to transmit the signal, and the T means our cable type in this case twisted-pair Now, we have Ethernet is defined as the discussed different types of twisted-pair cabling, IEEE 8023 standard but CAT 3 is the one that runs at 10 Mbps, so it is the cable used in 10BaseT
Network Architectures
The first types of network architecture to look at are the different Ethernet architectures When designing networks, one of the first decisions we usually make is Do we want to use Ethernet or the competing network architecture called Token Ring Oh, we want to use Ethernet What flavor of Ethernet This section will help you understand what the different flavors of Ethernet are
10base2
The 10Base2 Ethernet architecture is a network that runs at 10 Mbps and uses baseband transmissions 10Base2 typically is implemented as a bus topology, but it could be a mix of a bus and a star topology The cable type that we use is determined by the character 10Base2 and 10Base5 at the end of the name of the architecture in follow what is known as the 5-4-3 rule, this case a 2 The 2 implies 200 meters Now, which means that there can be only five what type of cable is limited to approximately network segments in total, joined by four 200 m You got it; thinnet is limited to repeaters (more on repeaters in approximately 200 m (185 m, to be exact) The 3), but only three of those network only characteristic we have not mentioned is segments can be populated with nodes the access method that is used All Ethernet environments use CSMA/CD as a way to put data on the wire The following list summarizes features of 10Base2:
n Baseband communication n 10 Mbps transfer rate n Maximum distance of 185 meters per network segment n 30 hosts per segment n 05 meters minimum distance between hosts
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