Cisco CCNA / CCENT Certification Exam Training: Physical And Virtual LANs

Winning his CCENT Cisco certification and pass the test 640-822 requires that you master the basic networking, and part of that is knowing how to work with both physical and virtual local area networks (LANs).
A physical LAN is a collection of computer, cable, network cards, and other networking hardware - switches, routers, printers and servers, for example. When we refer to the physical network, you will rarely hear anyone say " LAN physical ". When someone mentions the creation of a local area network, but referred to the physical devices themselves.
So . What the hell is a virtual LAN " "? The name seems to suggest some kind of imaginary network, which is not quite true, since the physical LAN devices also will be part of the Virtual LAN (VLAN). What we are doing is logical to divide the network into smaller physical, logical networks - and these smaller groups are called logical VLANs.
Let & 39; s an example that will illustrate the concept and help explain why to be created in the first place VLANs. Let& 39;s say you have ten computers connected to the same network. As I explained in an earlier review Cisco CCENT tutorial, this can lead to the transmission of unnecessary emissions. If one sends a PC issue by default, the switch will forward a copy of the broadcasting framework to all other PCs.
Most probably not all of the other computers need a copy of that broadcast. We can logically group VLAN in these personal computers, and when a member of VLAN sends a broadcast, only to the other members of the same VLAN receiving broadcast.
For example, we could create three VLANs in this situation, placing the PC1 , PC2, and PC3 in VLAN 1; PC4, PC5, and PC6 would VLAN 2; finally, PC 7, 8, 9, 10 and could be placed in VLAN 3. When PC1 sends a broadcast, the switch sends a copy of this framework only to the issuance PC2 and PC3 - to the other members of that VLAN. The other six computers not get a copy of the image!
As may obtain information on the Internet, there is always a trap. In this scenario, not only in PCs VLAN 2 and 3 do not receive broadcasts sent by PC in VLAN1, but may not receive any traffic from the other guests. By default, traffic inter-VLAN is not possible in a switch, a model OSI Level 3 device must be involved. We will discuss how to enable inter-VLAN traffic in the next chapter of my review of training Cisco CCENT series!
Chris Bryant, CCIE 12933, is the owner of The Bryant Advantage, the home of free CCENT Cisco CCNA Certification Certification Exam and tutorials, The Ultimate Package Study CCNA, and Ultimate CCNP Study Packages.
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