Your CCNA studies will include things like a large amount of details about switches, and for good rationale. should you don’t understand simple switching theory, you https://en.wikipedia.org/wiki/?search=먹튀검증 could’t configure and troubleshoot Cisco switches, either around the CCNA Test or in the true planet. That goes double for trunking!
Trunking is actually enabling two or maybe more switches to speak and ship frames to one another for transmission to distant hosts. There are two major trunking protocols that we need to know the small print of for Examination good results and real-environment results, but ahead of we get on the protocols, Allow’s focus on the cables we'd like.
Connecting two Cisco switches needs a crossover cable. As you realize, you'll find 8 wires within an ethernet cable. In a very crossover cable, four with the cables “cross above” from a person pin to a different. For lots of newer Cisco switches, all you need to do to produce a trunk is hook up the switches by using a crossover cable. For instance, 2950 switches dynamically trunk when you connect them with the appropriate cable. If you employ the wrong cable, you’ll be there some time!
There are 2 distinctive trunking protocols in use on now’s Cisco switches, ISL and IEEE 802.1Q, normally known as “dot1q”. You'll find 3 most important dissimilarities concerning the two. Initial, ISL can be a Cisco-proprietary trunking protocol, exactly where dot1q is definitely the industry normal. (These of you new to Cisco screening ought to get accustomed to the phrases “Cisco-proprietary” and “market standard”.) If you’re Doing the job in a multivendor environment, ISL will not be a good choice. And While ISL is Cisco’s individual trunking protocol, some Cisco switches run only dot1q.
ISL also encapsulates the entire body, increasing the community overhead. Dot1q only sites a header about the frame, and in some conditions, doesn’t even try this. There is a lot less overhead with dot1q compared to ISL. That brings about the third main difference, the way in which the protocols get the job done Together with the indigenous vlan.
The indigenous vlan is simply the default vlan that switch ports are put into if they don't seem to be 토토사이트 expressly positioned into An additional vlan. On Cisco switches, the native vlan is vlan one. (This may be changed.) If dot1q is operating, frames that are going to be sent through the trunk line don’t even have a header placed on them; the remote swap will believe that any body which includes no header is destined with the native vlan.
The challenge with ISL is that is doesn’t comprehend what a local vlan is. Each and every frame are going to be encapsulated, regardless of the vlan it’s destined for.
Switching theory is a large component of the CCNA experiments, and it could possibly seem overwhelming initially. Just crack your reports down into lesser, extra manageable pieces, and soon you’ll see the magic letters “CCNA” powering your identify!