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Network topologies man
Relatiohship between logical design and physical design
Network topologies analyses
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Network Design:
Logical and Physical Design
In networking terminology, the term network topology refers to the entire structure of the network. There are two primary parts to the topology definition: the physical design, which is the actual layout of the wire (media), and the logical design, which defines how the media is accessed by the hosts. The physical designs that are commonly used in networks are the Bus, Ring, Star, Extended Star, Hierarchical, and Mesh.
A bus topology uses a single backbone segment (length of cable) that all the hosts connect to directly. A ring topology connects one host to the next and the last host to the first. This creates a physical ring of cable. A star topology connects all cables to a central point of concentration. This point is usually a hub or switch. An extended star topology uses the star topology to be created. It links individual stars together by linking the hubs/switches. This will extend the length and size of the network.
A hierarchical topology is created similar to an extended star but instead of linking the hubs/switches together, the system is linked to a computer that controls the traffic on the topology. A mesh topology is used when there can be absolutely no break in communications, for example the control systems of a nuclear power plant. Each host has its own connections to all other hosts. This also reflects the design of the Internet, which has multiple paths to any one location.
The logical topology design of a network is how the hosts communicate across a medium. The two most common types of logical designs are broadcast and Token-passing.
Broadcast topology simply means that each host sends its data to all other hosts on the network medium. There is no order the stations follow to use the network, it is first come, first serve. This is the way that Ethernet functions.
The second type is token-passing. Token-passing controls network access by passing an electronic token sequentially to each host. When a host receives the token that means that the host can send data on the network. If the host has no data to send, it passes the token to the next host and the process repeats itself.
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...ses are to provide a mechanism to connect Personal Computers (PC) to each other for day-to-day operations and ad hoc testing, and transfer data from lab to lab at high speed. Each lab is connected to every other lab via 1Gbps Ethernet links running over Category 6 cables. This network is not part of the DISN-LES. System Administrators (SA) can reconfigure computers and network connectivity to suit mission requirements.
Some computers are used on both the DE and FM, but not simultaneously. An example of this would be a computer in the JDEP lab that is serving as the Data Extraction/Data Reduction (DX/DR) server during a test event. The computer is disconnected from the DISN-LES and connected to the FM. The data is then transferred at high speed to a computer in the TAMD laboratory. The computer is then disconnected from the FM and reconnected to the DISN-LES. Personnel in the TAMD laboratory can then back up the data and perform analysis.
The JCAN is actually a very simple network scheme. Although, it only serves approximately fifty users, is does so efficiently while maintaining a high degree of system/network security.
These rules are also known as bus protocols. The design of a bus system contains several pro’s and con’s related to the size of the data bus, data transfer size, bus protocols, and clocking. Bus systems are categorized as asynchronous and synchronous buses depending on whether the bus communications are controlled by a clock. There are parallel and serial buses depending on whether the data bits are sent on parallel wires or multiplexed onto one single wire.
“Network topology is the arrangement of the various network elements such as node, link, of computer network. Basically, it is topological structure of a network which ether be physically or logically.”
MAC Layer Connections: Management connections and data transport connections are two connections in this layer. The management connections have three types: basic, primary, and secondary. A basic connection and primary connection are created for each MS when they join the network. A basic connection is used for short and urgent management message. And a primary connection is used for delay-tolerant management messages. The secondary connection is used for IP summarized management messages such as dynamic host configuration protocol [DHCP], and simple network management protocol [SNMP]. Transport connections can be provisioned or can be recognized on demand. They are used for user traffic flows. Unicast or multicast can be used for transmission.
The networks are split into two groups. There is a Production network and a Development network. Each of these networks resides on their own separate sub network. The reason for splitting the networks into two is to prevent network overload and slowdowns that would otherwise affect other departments within MKS such as Customer Service or Accounting. The production network involves non-development tasks such as the customer service database, email, the order entry and accounting systems. The development network involves all areas relating to product development. This network covers the server that stores base code, the development system, development tools, software libraries and software builds.
To attempt to define a network in a few sentences would be a fool’s errand. A network could be seen as simply a grid of interconnecting connections between multiple bodies. However when this vision is applied to real-world systems, they all start to differ. There is not anything that exists in the universe that is not part of a network. A network is the result of different parts or members which have similarities in parts of their identity. This similarity that they have in common, they will also have with other bodies forming a network between them. Most of these factors of identity are different from those of most others. As a result, each factor will be in common with different other members of different networks. Each factor includes this body in a multitude of networks. This means that no one thing is in one and only one network, but is included in many.
I. Preparation. I began my observation with Maricela in unit 6 in the clinic. Maricela was excellent at greeting the patient and asking about her day. She made the patient feel very welcomed and comfortable which was especially necessary for this appointment because the patient—again an elderly woman—had a complete upper denture and only seven permanent teeth left which seemed to make the patient slightly embarrassed. When Maricela took the denture to clean it and to do her intra/extra oral exam, the lady wouldn’t really look at Maricela or
The first is called store to forward, which is used transferring digital images from one location to another (Wager, Lee, & Glaser, 2013, p. 157).
It just doesn't get much simpler than the physical bus topology when it comes to connecting nodes on a Local Area Network (LAN). The most common implementation of a linear bus topology is IEEE 802.3 Ethernet. All devices in a bus topology are connected to a single cable called the bus, backbone, or ether. The transmission medium has a physical beginning and an end. All connections must be terminated with a resistor to keep data transmissions from being mistaken as network traffic. The terminating resistor must match the impedance of the cable.
The Ethernet protocol requires that a signal sent out over the LAN reach every part of the network within a specified length of time. The 5-4-3 rule ensures this. Each repeater that a signal goes through adds a small amount of time to the process, so the rule is designed to minimize transmission times of the signals.
Local Area Networks also called LANs have been a major player in industrialization of computers. In the past 20 or so years the worlds industry has be invaded with new computer technology. It has made such an impact on the way we do business that it has become essential with an ever-growing need for improvement. LANs give an employer the ability to share information between computers with a simple relatively inexpensive system of network cards and software. It also lets the user or users share hardware such as Printers and scanners. The speed of access between the computers is lighting fast because the data has a short distance to cover. In most cases a LAN only occupies one or a group of buildings located next to each other. For larger area need there are several other types of networks such as the Internet.
The Internet consists of a three level hierarchy composed of backbone networks (e.g. ARPAnet, NSFNet, MILNET), mid-level networks, and stub networks. These include commercial (.com or .co), university (.ac or .edu) and other research networks (.org, .net) and military (.mil) networks and span many different physical networks around the world with various protocols, chiefly the Internet Protocol.
Synchronous Transmission: The synchronous signaling methods use 2 different signals. A pulse on one signal indicates when another bit of information is ready on the other signal. This is high speed data communication.
Explain how the two important transport protocols deliver messages on behalf of the application and discuss the differences between them
The term Topology refers to the physical or logical shape or layout of a network. Communication between different nodes within a network is determined by its topology. Mesh, Bus, Ring and Star are four of the most common network topologies, each with advantages and disadvantages in relation to each other.
A Mesh topology is a style of connecting computers in a network in a fashion where every link has a redundant path. A mesh topology is also known as a self healing network in that if a segment of the network fails for what ever reason then the data can still be transmitted across another linked path. This would include possibly hoping across a few extra network segments to reach the destination but it would be able to do it. This redundancy of course comes with a price for the extra pathing that would be incurred to ensure that every node will be able to see every other node.