Under what circumstances should an administrator prefer local VLANs over end-to-end VLANs?
A.
Eighty percent of traffic on the network is destined for Internet sites.
B.
There are common sets of traffic filtering requirements for workgroups located in multiple buildings.
C.
Eighty percent of a workgroup’s traffic is to the workgroup’s own local server.
D.
Users are grouped into VLANs independent of physical location.
Explanation:
This geographic location can be as large as an entire building or as small as a single switch inside a wiring closet. In a geographic VLAN structure, it is typical to find 80 percent of the traffic remote to the user (server farms and so on) and 20 percent of the traffic local to the user (local server, printers, and so on). Reference: Building Cisco Multilayer Switched Networks (Cisco Press) page 93
I think the right answer is C.
It’s logical and also here is what I found on CCNP BCMSN Exam Cram 2 (Exam Cram 642-811) By Richard Deal:
“There are two generic rules when dealing with traffic flow: 80/20 and 20/80. The 80/20 rule assumes that 80% of the traffic stays local to a VLAN and 20% leaves a VLAN through a Layer 3 device. Local VLANs assume this premise. Note that with this implementation, VLANs are solely used to solve broadcast problems.”
Thanks.
From cert guide:
Local VLAN: rule 20/80O says that only 20 percent of traffic is local, whereas 80 percent is destined to a remote resource across the core layer. End users usually require access to central resources outside their VLAN. Users must cross into the network core more frequently. In this type of network, VLANs should be designed to contain user communities based on geographic boundaries, with little regard to the amount of traffic leaving the VLAN.
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