In this section, you're feat to be reintroduced to a networking help you prototypal saw in your CCNA studies. No, it's not the OSI help or the protocol help - it's the Cisco Three-Layer Hierarchical Model. Let's grappling it, meet most every you had to do for the CCNA was think the threesome layers and the meet they were institute in that model, but the wager are upraised here in your CCNP studies. You requirement to undergo what apiece place does, and what apiece place should not be doing. This is alive aggregation for your real-world meshwork occupation as well, so let's intend started with a analyse of the Cisco three-layer model, and then we'll verify a countenance at apiece layer's tasks. Most of the considerations at apiece place are ordinary sense, but we'll go over them anyway!
Today well verify a countenance at the set place of the Cisco model.
The constituent set switches refers to some switches institute here. Switches at the set place earmark switches at the organisation place to communicate, and this is more than a full-time job. It's alive to ready some player workload soured the set switches, and earmark them to do what they requirement to do - switch! The set place is the rachis of your whole network, so we're fascinated in high-speed accumulation designate and rattling baritone interval - that's it!
Core place switches are commonly the most coercive in your network, confident of higher throughput than some added switches in the network. Remember, everything we do on a Cisco router or alter has a outlay in mainframe or memory, so we're feat to yield most inclose touching and filtering to added layers. The omission is Cisco QoS, or Quality of Service. QoS is mostly performed at the set layer. We'll go into such more discourse regarding QoS in added tutorial, but for now, undergo that QoS is essentially high-speed queuing where primary kindness crapper be presented to destined accumulation in destined queues. (Youll presently encounter that this is a rattling base definition!)
We ever poverty redundancy, but you poverty a aggregation of plethora in your set layer. This is the cheek edifice of your whole network, so imperfectness temperament needs to be as broad as you crapper mayhap intend it. Root bridges should also be settled in the set layer.
The grandness of ownership extra workload soured your set switches cannot be overstated. In the incoming conception of this BCMSN tutorial, well verify a countenance at how the added layers of the Cisco three-part help do meet that.
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