ccna 200 301 syllabus definition and example of irony

ccna 200 301 syllabus definition and example of irony.Having said that, if you work for an ISP, you may find that the physical topology used by SONET technology or other WAN technologies is a ring topology. The physical topology of the LAN no longer uses a ring topology.In the 1980s and early 1990s, LANs that used a ring physical topology were Token Ring technology and FDDI (Fiber Distributed Data Interface) technology. These LAN technologies are no longer used today, but are still referenced in the Data Center CCNA exam content.1.3.4 Mesh topologyIn this type of network, you will find that every machine in the network is directly connected to all other machines. There are a lot of connections, and in fact a mesh topology is the type of topology that "has the most physical connections to a single device"! This topology type is not often (or even never) used in LAN environments today, but you will see a variation of the mesh topology in the WAN (including the Internet): HybridMesh.Hybrid mesh topology networks are able to create redundancy (backups), but tend to implement fewer connections between specific devices. Sometimes other types of topologies are used within this topology type, which is why it is named Hybrid. In any case, such a network is not a fully meshed topology as long as interconnections are not established between all devices in the network. But a hybrid network topology is complex enough - Figure 1.11 shows how complex a network containing just four devices can be.Figure 1.10 A typical ring networkWith more cabling and connections, the complexity of the network is increasing. If there are sites or hosts in the network, there are gamma-1)/2 connections. This means that if there are only 4 computers in the network, 4X(4-1)/2 or 6 connections are required. If this small network grows to have 10 computers, the number of connections needed grows to 45. This growth trend comes with a huge overhead, so only small networks can really apply and manage this topology type well. From the goodFigure 1.11 Typical mesh topologyThe fully meshed physical topology is the least conflict-prone network.On the one hand, the mesh topology provides a good fault tolerance mechanism. But the good news is that we don't use mesh topologies in enterprise LANs anymore.