Explaining the Differences Including Advantages and Disadvantages NTC/360 By Betsy Grissom Earl Sortor November 15, 2010 Introduction After reading this paper the reader should know how each of the terms works in a computer. The reader will also have knowledge of each terms advantages and disadvantages. Mesh Topology A mesh network has a very simple concept. Because of the simple concept a mesh network has fewer chances of breaking down the network.
Many possible combinations of routes and hops data transferred can take one way or another to the destination. All of the nodes connect to each other, which makes mesh topology a complete network.The data is automatically configured to take the shortest route.
An advantage would be that mesh topology provides redundant paths between devices. A disadvantage is that a mesh topology requires more cables. Complication of implementation is another disadvantage.
Bus Topology With a bus topology all node on the network shares a common bus, whereas, the nodes also shares communication. Because the bus topology is sharing with others, only one device when transmitting is done one at a time. The bus topology connects each of the nodes to a single line. The single line is typically a coax cable.A protocol determines which computer is to transmit. Advantages to the bus topology if there is a failure at one station the failure will not affect others. Suited for temporary networks of the bus topology setup must be done in a hurry. Bus topologies are also easy to implement and extend.
A bus topology does have its disadvantages. Bus topology requires a network to detect when two nodes are transmitting at the same time. If there is a heavy traffic rate a bus topology does not cope well. The bus topology is difficult to troubleshoot. The bus topology has a limit to the number of stations and the cable length.A break in the cable causes the entire network to disable and cost to maintenance could be quite high.
Ring Topology For communication purpose, every device that has exactly two neighbors is a ring topology. All messages can travel clockwise or counterclockwise. The data passed in one direction is receive by each node. Then the node transfers to the next node. Advantages for the ring topology are that the data transmitted between the two nodes must pass through all the intermediate nodes. Another advantage is that a single central server is not required to manage the ring topology.A disadvantage is that if there are any changes made to the network nodes it will affect the performance of the entire network.
Another disadvantage is that if a single node fails the entire network will fail. Star Topology Computers and other devices connected to a hub are known as a star topology. Star topology received that name because when everything connected together it looks like a star. After installation the star topology resembles a bicycle wheel. Data transmitted through the cables is connected to the hub. The active central node in a star topology prevents transmission problems.Before data reaches the destination data is transmitted through the hub. The configuration of the star topology is done with the use of optical fiber cable, coaxial cable, or a twisted pair cable.
An advantage of using a star topology is that it is easy to wire and install. Another advantage is that the star topology gives a better performance than any other topology. Understanding, navigating, and the working of the star topology are simple to establish.
A main disadvantage to the star topology is that if the central hub has errors, then the communication between the systems fail.A limit to the number of networks connected to the hub is another disadvantage. Costly and the complication of wiring the system is another disadvantage. Ethernet Categorized by Ethernet is the amount of speed. Ethernet is the most common LAN technology that is being used today. Expressed in megabits per second (Mbps) is the speed. Ethernet has two speed categories. One category is standard Ethernet, which operates at a fast 10Mbps.
Standard is quick enough for most networking tasks. The other category is fast Ethernet. Fast Ethernet operates at 100Mbps.Fast Ethernet is ideal for video, multimedia, and any other applications that require much speed. An advantage for Ethernet is that it is very cheap. Another advantage is that it can work with star topology as well as bus topology. Ethernet is not too complex to install.
About the disadvantages, if there is heavy traffic then the traffic will cause delays in the system. Ethernet does not work well with voice signals. Token Ring A Token Ring network is a local area network (LAN). A Token Ring is used to prevent collision of data between two computers that wants to send messages at the same time.After Ethernet, the Token Ring protocol is the second most widely used protocol. Advantages of the Token Ring are that it is fairly simple to wire, and quite fault tolerant. When the main ring disconnects anywhere the ring uses a loop back system. The disadvantages are that it uses Type 1 cable.
The cable is very bulky and not suitable for running voice. Any additions to add to the Token Ring network means rewiring and re-routing the cables. FIDDI Fiber distributed data interface (FIDDI) provides a standard data transmission in a local area network. FIDDI is often uses as a backbone network.It connects several networks together. FDDI uses either a fiber optic cable or until recently an UTP cable.
FDDI is more powerful method than the Token Ring. Advantages of FDDI are that it supports real-time allocation of network bandwidth, allows the user to use a wide array of different types of traffic, and compensates for wiring failures. Disadvantages are that there is a potential for multiple ring failures, and the use of fiber optic cables are expensive. Wireless Networks Operated by a network of cellular towers and satellites is a wireless network.Wireless network is a convenience for society. When using a wireless network, the individual has access to the Internet when there is no access to an Ethernet cable. Some devices that use wireless networks are cell phones, laptops, and handheld computers. Advantages on a wireless network are no bulky cables to connect to, most businesses offer WIFI where can quickly connect to the Internet.
A big disadvantage would be security. If an individual connects in a public place, the person close to the individual could view the traffic and join the network. Reception is another disadvantage.
The signal strength can vary because of the weather or the proximity of the wireless router. Levels of the OSI model TCP/IP functions The OSI model has seven layers. The TCP/IP function uses three of the seven layers. The three layers are transport layer, network layer, and network access layer. The transport layer has two transport layer protocols. A Transmission Control Protocol (TCP) guarantees information transmission. A User Datagram Protocol (UDP) transports datagram without end-to-end reliability checking.
The primary protocol in the TCP/IP Network Layer is the Internet Protocol (IP).All upper and lower communications must travel through IP. In the TCP/IP architecture the Data Link Layer and the Physical Layer of the OSI model grouped as the Network Access layer. Here it makes good use and interfaces with the existing data link protocols such as Ethernet, Token Ring, and FDDI.
Conclusion Defining these terms is possible to see the progress that has been made in communication not just voice communication but the ability to send and receive information from much distances and, of course, the invention and progress of the Internet as a newest means of communication.