Network Transmission Media
A Mesh topology Provides each device with a point-to-point connection to every other device in the network. These are most commonly used in WAN's, which. associated wiring between assets. Conversely, Logical A point to point topology is a direct connection between two devices particular link then the transmission can be sent via the In shared media topology the systems have unrestricted. Comparison Between Network Topologies - Download as PDF File .pdf), Text File .txt) or read online. the connection transmission medium is a branching .
Repeaters work within the physical layer of the OSI model, that is, there is no end-to-end change in the physical protocol across the repeater, or repeater pair, even if a different physical layer may be used between the ends of the repeater, or repeater pair.
Repeaters require a small amount of time to regenerate the signal. This can cause a propagation delay that affects network performance and may affect proper function.
As a result, many network architectures limit the number of repeaters that can be used in a row, e. USB networks use hubs to form tiered-star topologies. Ethernet hubs and repeaters in LANs have been mostly obsoleted by modern switches. Bridges[ edit ] A network bridge connects and filters traffic between two network segments at the data link layer layer 2 of the OSI model to form a single network. This breaks the network's collision domain but maintains a unified broadcast domain.
Network segmentation breaks down a large, congested network into an aggregation of smaller, more efficient networks.
Topologies & Transmission Media
Bridges come in three basic types: Directly connect LANs Remote bridges: Remote bridges, where the connecting link is slower than the end networks, largely have been replaced with routers.
Switches[ edit ] A network switch is a device that forwards and filters OSI layer 2 datagrams frames between ports based on the destination MAC address in each frame. It can be thought of as a multi-port bridge. If an unknown destination is targeted, the switch broadcasts to all ports but the source. Switches normally have numerous ports, facilitating a star topology for devices, and cascading additional switches.
Multi-layer switches are capable of routing based on layer 3 addressing or additional logical levels. The term switch is often used loosely to include devices such as routers and bridges, as well as devices that may distribute traffic based on load or based on application content e. Routers[ edit ] A typical home or small office router showing the ADSL telephone line and Ethernet network cable connections A router is an internetworking device that forwards packets between networks by processing the routing information included in the packet or datagram Internet protocol information from layer 3.
The routing information is often processed in conjunction with the routing table or forwarding table. A router uses its routing table to determine where to forward packets. A destination in a routing table can include a "null" interface, also known as the "black hole" interface because data can go into it, however, no further processing is done for said data, i.
Modems[ edit ] Modems MOdulator-DEModulator are used to connect network nodes via wire not originally designed for digital network traffic, or for wireless. To do this one or more carrier signals are modulated by the digital signal to produce an analog signal that can be tailored to give the required properties for transmission.
Modems are commonly used for telephone lines, using a Digital Subscriber Line technology. Firewalls[ edit ] A firewall is a network device for controlling network security and access rules. Firewalls are typically configured to reject access requests from unrecognized sources while allowing actions from recognized ones.
- Is there any relationship between transmission media and topology
- Is there any relationship between transmission media and topology?
- Network topology
The vital role firewalls play in network security grows in parallel with the constant increase in cyber attacks. Classification[ edit ] The study of network topology recognizes eight basic topologies: Point-to-point telecommunications The simplest topology with a dedicated link between two endpoints. Easiest to understand, of the variations of point-to-point topology, is a point-to-point communication channel that appears, to the user, to be permanently associated with the two endpoints. A child's tin can telephone is one example of a physical dedicated channel.
Computers on a bus only listen for data being sent they do not move data from one computer to the next, this is called passive topology.
Mesh A Mesh topology Provides each device with a point-to-point connection to every other device in the network. These are most commonly used in WAN's, which connect networks over telecommunication links.
Mesh topologies use routers to determine the best path. Mesh networks provide redundancy, in the event of a link failure, meshed networks enable data to be routed through any other site connected to the network.
is there any relationship between transmission media and topology? | Yahoo Answers
Because each device has a point-to-point connection to every other device, mesh topologies are the most expensive and difficult to maintain.
Ring In a ring topology network computers are connected by a single loop of cable, the data signals travel around the loop in one direction, passing through each computer. Ring topology is an active topology because each computer repeats boosts the signal before passing it on to the next computer. One method of transmitting data around a ring is called token passing. The token is passed from computer to computer until it gets to a computer that has data to send. If there is a line break, or if you are adding or removing a device anywhere in the ring this will bring down the network.
In an effort to provide a solution to this problem, some network implementations such as FDDI support the use of a double-ring. If the primary ring breaks, or a device fails, the secondary ring can be used as a backup.
Wireless A wireless network consists of wireless NICs and access points. Access points act as wireless hubs to link multiple wireless NICs into a single subnet. Wireless and wired devices can coexist on the same network.