7 LAN topologies - bus, ring, star, hybrid, mesh ...

hello and this is sunny welcome back today my topic is about LAN topology topology refers to how network devices are connected it belongs to the layer one or physical layer of the OSI model topology can include three categories physical logical and hybrid physical topology refers to how Network Devices are physically connected by physical it means we can actually see the layout of the network logical topology refers to how devices are connected with the regards to signal flow it is the way that the signals travel on the network media or the way the signal passes through the network from one device to the next without regard to the physical connections in my class there are always one or two students who are physically sitting in my classroom but logically they are far far away I call this phenomenon spacing out if we combine physical analogical we get hybrid topology let me talk about eight different topologies in next seven minutes let me start with the simple one point-to-point topology p2p topology is where's one device is directly connected with another device very simple but it is the foundation for all other topologies point to multi-point topology consists of central base station that supports other subscribe stations data transmitted from the central base station is broadcasting to all the subscribers but a data coming from a subscriber is only received by the base station p2m topology is a typically using wireless LAN and a wireless one bus topology is also called des aging topology in bus topology there's no central device every network node is attached to Y shared bus cable in bus topology when node a is sending a signal to node B the signal goes to the bus an airy node attached to the bus gets a copy but only because the message and all others simply ignite embossing apology terminators are required at both ends to prevent data reflection without the terminators data signal would bounce back and forth and Lesley and ultimately the network will collapse rain topology is similar to bus topology all nodes are connected to a keyboard that forms a closed loop thus there is no need for termination data flows from one node to next one in circle each node reads the data anaphoras it to next one until it reaches the destination both bus and arraign topology are simple and inexpensive but they are not afford tolerant one single point breaks and the whole system will be done troubleshooting and maintenance are difficult to security is a major problem because every node can access to all other traffic's star topology is where all nodes are individually connected to a central device like a hub or switch star topology has benefits over both paths and a ring for his fault tolerance scalability troubleshooting and maintenance however central point of failure we all crash the whole system now let's talk about hybrid topology a combination of physical topology and a logical topology here we only focus two hybrid topologies starving and estabas starving hybrid topology is the combination of a physical star and logical ring in this example physically we can see a star logical ring topology is where data flows inside the central device when computer age sends the data to be for example data flows from a to the central device if we can follow data inside the box we can see the mowing allow a rain electronically enjoy the finds the connection to computer B stop our topology is the combination of physical star and logical bus in this example we can see a physical star topology logical bus topology is where data flows inside the central box when computer a since data to be for example data flows from a to the central device if we can follow data inside the box we can see the mowing a la a bus electronically stop our topology is the most common Ethernet LAN topology by the way please do not confuse star bus with Starbucks why is the topology and the other one is a coffee they are not related last but not least mesh topology there are two types of mesh topology fully meshed topology means every node connects to every other node while partially meshed topology is a similar to fully meshed but only with fewer connections for the same number of devices partially mesh topology might be practical for physical connections while fully Magic topology is practical in wireless network but for physical connections fully meshed topology should be considered carefully the formula to calculate the number of connections in fully meshed topology is a C equal n times a minus 1/2 where C is the number of connections and a is the number of devices for 6 devices for example we need 15 connections not too bad for 20 devices we need 190 connections well it is still manageable but for 100 devices we need 4950 connections it would be too expensive and extremely impractical in our real world no one will do like this except governments and stupid people with a lot of money I hope this video is helpful thank you very much and see you next time oh don't forget to subscribe you [Music]

Channel: Sunny Classroom

Views: 30,460

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Keywords: sunnyclassroom sunny classroom, wireless, TCP/IP, Ethernet, virtual Network, computer and computing, programs, Sunny Sun, Kansas, networking+ cybersecurity security+ networking + cyber threats cyber defense IoT Wi-Fi security, LAN topologies, physical, logical, hybrid, ring, bus, point to point, point to multipoint, star-bus, star-ring, mesh, fully meshed topology, partially meshed topologies.

Id: T5xQJk-Aamk

Length: 8min 34sec (514 seconds)

Published: Sat Dec 01 2018