If you’re finding out in your CCNA exam, whether you’re taking the Intro-ICND path or the one-examination path, you’re rapidly introduced to the truth that switching happens at Layer 2 of the OSI model. No problem there, but then other phrases involving switching are thrown in, and a few of them could be more than a bit confusing. What is “cell switching”? What is “circuit switching”? Most confusing of all, how will you have “packet switching”? Packets are found at Layer 3, however switching happens at Layer 2. How can packets be switched?
Chill out! As you will see on this article, the terms aren’t that onerous to keep straight. Packet switching, for instance, describes a protocol that divides a message into packets earlier than they’re sent. The packets are then sent individually, and should take completely different paths to the identical destination. As soon as the packets arrive on the final destination, they are reassembled.
Mallard Ducks: Most Popular Duck Species
Body switching follows the identical course of, but at a unique layer of the OSI model. When the protocol runs at Layer 2 slightly than Layer 3, the method is known as body switching.
Cell switching additionally does a lot the identical thing, but because the name implies, the device in use is a cell switch. Cell-switched packets are mounted in length. ATM is a well-liked cell-switching technology.
The method of circuit switching is only a bit completely different, in that the process of setting up the circuit itself is part of the process. The channel is about up between events, data is transmitted, and the channel is then torn down. The circuit-switching expertise most familiar to CCNA candidates is ISDN.
Don’t let these terms confuse you. The 4 totally different phrases are describing much the same process. The main difference is that they’re occurring at totally different levels of the OSI mannequin, and using a unique transport method to get the data where it needs to go.
we can easily to make free translation this page with free translation software