A local university is deciding between three different computer networks. The network servers have a mean time between failure and mean time to repair as shown in the table. MTBF MTTR
Server A 100 hrs 1 hour
Server B 250 hrs 2 hours
Server C 400 hrs 3 hours
Which server(s) will provide the greatest availability?
A) Server A
B) Server B
C) Server C
D) Server A and Server B
E) Server B and Server C

Question

Quizplus · Accepted Answer

To determine availability, we can use the formula: 
Availability = MTBF / (MTBF + MTTR)

For each server, the availability is:
- Server A: 100 / (100+1) = 99.01%
- Server B: 250 / (250+2) = 99.21%
- Server C: 400 / (400+3) = 99.3%

Based on these calculations, Server C provides the greatest availability with an availability of 99.3%. Therefore, the best choice is Server C.

A Local University Is Deciding Between Three Different Computer Networks