Your CCNA research will incorporate a large amount of details about switches, and for good reason. when you don’t realize essential switching principle, it is possible to’t configure and troubleshoot Cisco switches, possibly over the CCNA Test or in the actual environment. That goes double for trunking!
Trunking is just enabling two or even more switches to speak and ship frames to one another for transmission to distant hosts. There are 2 key trunking protocols that we have to know the details of for exam achievement and genuine-planet success, but ahead of we get towards the protocols, Allow’s focus on the cables we want.
Connecting two Cisco switches requires a crossover cable. As you are aware of, there are actually 먹튀검증 8 wires within an ethernet cable. In a very crossover cable, four from the cables “cross around” from one pin to a different. For many newer Cisco switches, all you might want to do to create a trunk is hook up the switches having a crossover cable. For illustration, 2950 switches dynamically trunk after you join them with the right cable. If you use the incorrect cable, you’ll be there some time!
There's two diverse trunking protocols in use on today’s Cisco switches, ISL and IEEE 802.1Q, typically called “dot1q”. There are actually 3 major differences between The 2. 1st, ISL can be a Cisco-proprietary trunking protocol, wherever dot1q is the industry typical. (These of you new to Cisco screening need to get accustomed to the phrases “Cisco-proprietary” and “industry standard”.) Should you’re Operating within a multivendor atmosphere, ISL might not be a good selection. And even though ISL is Cisco’s individual trunking protocol, some Cisco switches run only dot1q.
ISL also encapsulates the complete frame, increasing the community overhead. Dot1q only destinations a header about the body, and in some conditions, doesn’t even do that. There is much less overhead with dot1q when compared with ISL. That contributes to the third key change, https://en.wikipedia.org/wiki/?search=먹튀검증 the way in which the protocols work While using the native vlan.
The native vlan is just the default vlan that swap ports are positioned into if they're not expressly placed into another vlan. On Cisco switches, the indigenous vlan is vlan 1. (This may be improved.) If dot1q is working, frames that are likely to be sent throughout the trunk line don’t actually have a header placed on them; the remote switch will suppose that any body that has no header is destined for the native vlan.
The problem with ISL is that is doesn’t fully grasp what a native vlan is. Each and every frame is going to be encapsulated, whatever the vlan it’s destined for.
Switching idea is a huge component of your respective CCNA research, and it may feel overpowering at the outset. Just split your research down into scaled-down, more workable sections, and soon you’ll begin to see the magic letters “CCNA” at the rear of your title!