Your CCNA reports are going to consist of quite a bit of information regarding switches, and for good https://en.wikipedia.org/wiki/?search=먹튀검증 cause. in case you don’t realize basic switching idea, you could’t configure and troubleshoot Cisco switches, possibly within the CCNA Test or in the real world. That goes double for trunking!
Trunking is actually enabling two or even more switches to communicate and ship frames to one another for transmission to distant hosts. There are two key trunking protocols that we have to know the details of for Test achievement and actual-world success, but ahead of we get for the protocols, Permit’s talk about the cables we want.
Connecting two Cisco switches demands a crossover cable. As you know, you will find 8 wires inside an ethernet cable. Within a crossover cable, 4 in the cables “cross more than” from one pin to a different. For numerous newer Cisco switches, all you have to do to create a trunk is link the switches with a crossover cable. As an example, 2950 switches dynamically trunk as soon as you link them with the right cable. If you employ the wrong cable, you’ll be there a while!
There's two various trunking protocols in use on now’s Cisco switches, ISL and IEEE 802.1Q, frequently often called “dot1q”. You will find 3 most important discrepancies among the two. 1st, ISL is really a Cisco-proprietary trunking protocol, where dot1q is the sector regular. (People of you new to Cisco screening need to get used to the phrases “Cisco-proprietary” 토토사이트 and “industry standard”.) In the event you’re Doing the job in the multivendor setting, ISL may not be a good choice. And Regardless that ISL is Cisco’s possess trunking protocol, some Cisco switches run only dot1q.
ISL also encapsulates the entire frame, growing the community overhead. Dot1q only areas a header to the body, and in certain situation, doesn’t even do that. You can find significantly less overhead with dot1q as compared to ISL. That brings about the third important distinction, just how the protocols work Together with the indigenous vlan.
The indigenous vlan is simply the default vlan that change ports are placed into if they're not expressly placed into another vlan. On Cisco switches, the indigenous vlan is vlan 1. (This may be adjusted.) If dot1q is functioning, frames that will be sent across the trunk line don’t also have a header placed on them; the remote change will think that any body which includes no header is destined with the native vlan.
The problem with ISL is that's doesn’t comprehend what a native vlan is. Each and every body will be encapsulated, whatever the vlan it’s destined for.
Switching theory is a huge element of your CCNA scientific tests, and it could possibly appear to be frustrating to start with. Just break your research down into smaller, much more workable components, and soon you’ll see the magic letters “CCNA” behind your name!