Logical Star Topology
In the star topology, one of the biggest advantages is that when one system goes down, it does not bring the rest of the network down with it as it does in the bus or ring topologies. The star topology is the most prevalent topology in use today. Logical Topologies. Introduction While studying for the CISSP exam, you need to be. A hierarchical topology is similar to an extended star. However, instead of linking the hubs or switches together, the system is linked to a computer that controls the traffic on the topology. Logical Topology: The logical topology of a network determines how the hosts communicate across the medium. The two most. A logical topology describes how network devices appear to be connected to each other. For example, in a logical diagram of your office network, you may show a connection between city A and city B. The logical topology can be considered isomorphic to the physical topology, as vice versa. Early twisted pair Ethernet with a single hub is a logical bus topology with a physical star topology. While token ring is a logical ring topology with a physical star topology.
Updated: by Computer Hope Alternatively referred to as a star network, star topology is one of the most common network setups. In this configuration, every connects to a central network device, like a,, or computer. The central network device acts as a and the peripheral devices act as.
Logical Bus Topology
Depending on the type of used in each computer of the star topology, a or an network cable is used to connect computers together. The picture to the right shows how this network setup gets its name, as it is shaped like a star. Advantages of star topology • Centralized management of the network, through the use of the central computer, hub, or switch. • Easy to add another computer to the network.
• If one computer on the network fails, the rest of the network continues to function normally. Disadvantages of star topology • May have a higher cost to implement, especially when using a switch or router as the central network device. • The central network device determines the performance and number of nodes the network can handle. • If the central computer, hub, or switch fails, the entire network goes down and all computers are disconnected from the network.
Logical Star Trek Characters
The simplest form of the physical star topology consists of multiple cables—one for each network device—attached to a single, central connection device. For example, 10Base-T Ethernet networks are based on a physical star topology— each network device is attached to a 10Base-T hub by means of twisted-pair cable. In a real-life implementation of even a simple ph ysical star topology, the actual layout of the transmission media need not form a recognizable star pattern; the only required physical characteristic is that each network device be connected by its own cable to the central connection point. The simplest form of the physical star topology is illustrated in Figure 7.
In the star-wired ring physical topology, individual devices are conne cted to a central hub, as they are in a star or distributed star network. However, within each hub the physical connections form a ring. Where multiple hubs are used, the ring in each hub is opened, leaving two ends. Each open end is connected to an open end in some other hub (each to a different hub) so that the entire network cable forms one physical ring.
This physical topology, which is used in IBM's Token- Ring network, is illustrated in Figure 9.
The logical topology defines how the data should transfer. Contrast this to the physical topology, which consists of the layout of cables, network devices and wiring. Two of the most common logical topologies are: • Bus topology: Ethernet uses the logical bus topology to transfer data. Under a bus topology a node broadcasts the data to the entire network. All other nodes on the network hear the data and check if the data is intended for them. • Ring topology: In this topology, only one node can be allowed to transfer the data in a network at a given time.
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This mechanism is achieved by token (the node having token only can transmit the data in a network) and hence the collision can be avoided in a network.