Cisco Ccna Certification Tutorial Segmenting Your Network

Cisco Ccna Certification Tutorial Segmenting Your Network



Cisco CCNA Certification Tutorial: Segmenting Your Network
When you're getting started on your CCNA studies on your way to​ earning this certification, you're swamped with network device types that you're familiar with, but not quite sure how to​ use .​
Let's look at​ these networking devices and​ their main purposes.
Hubs and​ repeaters operate at​ Layer One of​ the​ OSI model, and​ they have one main purpose - regenerating the​ electrical signal that Layer One technologies carry .​
This regeneration helps to​ avoid attenuation, the​ gradual weakening of​ a​ signal .​
Much like a​ radio signal, the​ electric signals that travel at​ Layer One gradually weaken as​ they travel across the​ wire .​
Hubs and​ repeaters both generate a​ clean copy of​ the​ signal .​
While hubs and​ repeaters can be helpful, they do 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 2, a​ switch creates multiple collision domains by default each switch port is​ considered its own little collision domain .​
If 12 PCs are connected to​ a​ Cisco switch, you have 12 separate collision domains .​
Switches can be used to​ segment the​ network into smaller 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 3 of​ the​ OSI model and​ segment a​ network into multiple broadcast domains by default .​
Routers do not forward broadcasts as​ switches do, making the​ router the​ only device of​ the​ four we've discussed today that create multiple broadcast domains by default.
Knowing what each of​ these devices can and​ cannot do is​ essential to​ passing the​ CCNA and​ becoming a​ great network administrator .​
Good luck to​ you in​ both of​ these goals!




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