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route r
This device is called a ROUTER. Routers are by default configured to not pass the broadcast traffic to another networks to which it connects. But by some means it could be also a SWITCH - sometimes it can be configured to filter different type of network traffic.
switch
Large numbers of hosts on a single network:Actual Data OverheadA big part of the overhead is broadcasts.In this context, each network is called a broadcast domain.Switches forward broadcasts to each device connected to a switch port.If we can reduce broadcast overhead, it would improve performance on the network.
A broadcast storm is what occurs when the number of broadcasts on a broadcast domain reaches a certain level that causes the network to shut down for useful traffic entirely.
A broadcast storm can cause a network to become too congested to transfer any useful traffic; switches are susceptible to broadcast storms.
There are several ways to reduce network congestion. Subnetting and adding routers will break up broadcast domains and traffic. Adding VLANs will do the same while adding security. Upgrading the speed of NICs and wiring, i.e. moving from 10BaseT to 100 or 1000, will reduce congestion as will moving from half duplex transmissions to full duplex transmissions.
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router
elimination of broadcast traffic
HUB in a collision Domain, Switch in Local Network.Broadcasting in network is done to locate devices in Network. Hub broadcasts through all its port whereas Network Switch Broadcast traffics within a Port & out of all ports only if new device is to be found.