SWITCHED NETWORKS

SWITCHED NETWORKS

1. LAN Desing

   • Converging networks
     • Increasing complexity of networks
       • access the Internet and the corporate network longer limited to physical offices, geographical locations.
     • Elements of a convergent network
       • One of the main benefits of the transition to a converged network is that a single physical network must be installed and managed.
     • Cisco Borderless Networks
       • organizations to support a network without borders that can connect with anyone
     • Hierarchy in the switched networks without borders
       • creation of a switched network without borders requires the use of robust network design principles to ensure maximum availability
     • Access, distribution and central core layers
       • The access layer represents the perimeter of the network. The distribution layer interacts between the access layer and the core layer. The core layer is the backbone of a network.
   • Switched networks
     • Function of the switched networks
       • The function of the switched networks evolved remarkably in the last two decades
     • Form factors
       • the switch type is selected, the network designer must choose between a fixed or a modular

2. Switched Environment

   • Frame forwarding
     • Switching as a general concept in network and telecommunications technology
       • concept of frame switching and re-routing is universal
     • Switch forwarding methods
       • method of resending data frames in layer 2 was called "switching by storage and sending"..
     • Storage and shipping switching
       • storage and shipping switching has two main characteristics that differentiate it from the cutting method: error checking and automatic buffer storage.
     • Switching by cutting method
       • two advantage of switching by cutting method is that the switch has the ability to initiate the forwarding of a frame rather than the switching by storage and shipping.
   • The Switching domains
     • Collision domains
       • two or more devices in the same collision domain try to communicate .
     • Broadcast domains
       • interconnected switches forms a simple diffusion domain. Only network layer devices, such as routers
     • Relief of network congestion
       • , the interconnected switch ports try to establish a full-duplex link