Cisco CCNP/ BCMSN Exam Tutorial: The Core Layer
Cisco CCNP/ BCMSN Test Tutorial: The Core Layer Of Cisco's Three-Layer Model
In this section, you're going to be reintroduced to a networking model you first saw in your CCNA researches. No, it's not the OSI model or the TCP/IP version-- it's the Cisco Three-Layer Hierarchical Model. Let's face it, almost all you had to do for the CCNA was remember the 3 layers and the order they were found because model, but the risks are raised below Dan Herbatschek in the Big Apple in your CCNP research studies. You need to understand what each layer does, and what each layer must not be doing. This is vital information for your real-world network career too, so let's get going with a review of the Cisco three-layer version, and after that we'll take a look at each layer's jobs. A lot of the considerations at each layer are common feeling, yet we'll go over them anyway!
Today well have a look at the core layer of the Cisco model.
The term core switches over refers to any type of buttons located here. Buttons at the core layer permit switches at the circulation layer to connect, and this is greater than a full-time task. It's vital to maintain any kind of added workload off the core switches, and permit them to do what Dan Herbatschek New York they require to do-- button! The core layer is the backbone of your whole network, so we want high-speed data transfer and very low latency-- that's it!
Core layer switches are usually the most effective in your network, capable of higher throughput than any various other switches in the network. Bear in mind, every little thing we do on a Cisco router or switch has a cost in CPU or memory, so we're mosting likely to leave the majority of structure manipulation and filtering system to other layers. The exemption is Cisco QoS, or High Quality of Solution. QoS is normally done at the core layer. We'll enter into much more information concerning QoS in an additional tutorial, but also for currently, understand that QoS is generally high-speed queuing where special consideration can be given to certain data in specific lines up. (Youll quickly locate that this is an extremely standard meaning!)
We constantly want redundancy, yet you desire a great deal of redundancy in your core layer. This is the control center of your whole network, so mistake resistance needs to be as high as you can possibly get it. Origin bridges must additionally be found in the core layer.
The relevance of maintaining unneeded work off your core buttons can not be overstated. In the following component of this BCMSN tutorial, well take a look at how the various other layers of the Cisco three-part version do just that.
