By Terry Jack
This is the publication you must arrange for Cisco's development Cisco Multilayer Switched Networks (BCMSN) examination, 642-811. This research advisor provides:In-depth insurance of key examination issues useful info on designing and enforcing multilayer switched networks 1000's of hard evaluate questions modern examination training software program, together with a try out engine and digital flashcards Authoritative assurance of all examination themes, including:Utilizing the firm Composite version for designing networks utilizing the Switching Database supervisor inside a Catalyst swap working controlled VLAN companies on a switched community Configuring and verifying 802.1Q and ISL trunks Configuring entry ports for static and multi-VLAN club expanding bandwidth for interswitch connections with quickly and Gigabit EtherChannels allowing Spanning Tree Protocol on ports and VLANs changing CatOS to local IOS on Catalyst switches imposing IP telephony in a switched community atmosphere making plans, configuring, and imposing QOS
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Extra resources for CCNP: Building Cisco Multilayer Switched Networks Study Guide (642-811)
At the top of the hierarchy, the core layer is responsible for transporting large amounts of traffic both reliably and quickly. The only purpose of the core layer of the network is to switch traffic as quickly as possible. The traffic transported across the core is common to a majority of users. However, remember that user data is processed at the distribution layer, and the distribution layer forwards the requests to the core, if needed. If there is a failure in the core, every single user can be affected.
To centralize network services for security, reduced cost, and administration, the old 80/20 rule is obsolete and could not possibly work in this environment. All traffic must now traverse the campus backbone, which means we now have a 20/ 80 rule in effect. Twenty percent of what the user performs on the network is local, whereas up to 80 percent crosses the network segmentation points to get to network services. 2 shows the new 20/80 network. 2: A 20/80 network The problem with the 20/80 rule is not the network wiring and topology as much as it is the routers themselves.
However, the underlying concept has merit. Hierarchical design lends itself perfectly to fulfilling this concept. Now, let's take a closer look at each of the layers. 7: A hierarchical network design Core Layer The core layer is literally the core of the network. At the top of the hierarchy, the core layer is responsible for transporting large amounts of traffic both reliably and quickly. The only purpose of the core layer of the network is to switch traffic as quickly as possible. The traffic transported across the core is common to a majority of users.