A customer is seeking an upgrade for their campus LAN network. Currently, the customer has
access layer switches that support 18.10/100/1000 Mbps ports and one Gigabit uplink. The
customer wants better performance in the upgrade but also wants to minimize costs.
The network architect has used the Network Traffic Analyzer (NTA) for Intelligent Management
Center (IMC) to collect information about the access layer uplinks. These are the results:
For switches on Floor1,the peak utilization is650 Mbpson a Gigabit uplink. Onmost days, the
utilizationpeaks at about 400 Mbps. Peaksusually occur briefly.
For switches on Floo2,the peak utilization is800Mbpson a Gigabit Uplink. Duringactiveperiods,
the utilization often remainnear 800.
What is most appropriate plan for oversubscription in the new access layer? (For this question,
think only about oversubscription and not customer needs for redundancy)
A.
48 1 on floor 1 and 24 1 on floor 2
B.
24.1 on floor 1 and 4.1 on floor 2
C.
48 1 in all locations
D.
24 1 in all locations
D
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not the a?
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Floor 1 : 18/0.400 = 45 ~ 48
Floor 2 : 18/0.800 = 22.5 ~ 24
Reply A make more sense
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“A”
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Answer:A
Due to the formular: N*B/U=O ==> 48*1000/(1*1000 uplink) = 48:1 (oversubscription ratio)
floor 1 use below 50% usage
floor 2 use over 50% ==> upgrade floor 2 ==> add more uplink (2 uplinks)
==> 48*1000/(2*1000) = 24:1
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