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When you're obtaining began on your CCNA studies on your way to earning this certification, you are swamped with network device kinds that you are familiar with, but not really certain how to use. Let's look at these networking devices and their major purposes.

Hubs and repeaters operate at Layer 1 of the OSI model, and they have one main objective - regenerating the electrical signal that Layer 1 technologies carry. This regeneration assists to stay away from attenuation, the gradual weakening of a signal. Significantly like a radio signal, the electric signals that travel at Layer One particular progressively weaken as they travel across the wire. Hubs and repeaters both produce a "clean" copy of the signal.

Although hubs and repeaters can be beneficial, they do practically nothing as far as network segmentation is concerned. The first such device we encounter as we move up the OSI model is the switch. Operating at Layer two, a switch creates numerous collision domains by default each and every switch port is deemed its own little collision domain. If 12 PCs are connected to a Cisco switch, you have 12 separate collision domains.

Switches can be employed to segment the network into smaller sized broadcast domains, but this is not a default behavior. Virtual LAN (VLAN) configuration segments the network into smaller broadcast domains, since a broadcast sent by a host in one VLAN is heard only by other devices in the same VLAN.

Routers operate at Layer three of the OSI model and segment a network into numerous broadcast domains by default. Routers do not forward broadcasts as switches do, making the router the only device of the four we've discussed these days that produce multiple broadcast domains by default.

Understanding what every of these devices can and can't do is crucial to passing the CCNA and becoming a fantastic network administrator. Great luck to you in both of these goals! click here