1. Consider the equipment data, determine the availability and downtime per year. Equipment MTBF (hrs) MITR (hrs) Availability Downtime per year IP Router I/O Card 40,000 2 WDMOA 3,000,000 5 2. Consider the single bidirectional line in WDM optical network shown on page 31 in slide 2. Find the system availability using following information where Fiber optic cable has 500km of CC and 25 hours of MTTR. Equipment MTBF (hrs) MTTR (hrs) Bidirectional OA 650,000 20 Bi directional 800,000 15 WDM Line System 3. Consider the network configuration on page 40 in slide 2 or ll in slide 3, find the following availabilities when the availability of the link is 0.99 and availability of router is 0.98. (a) Without backup path (b) With the backup path 4. Compare two network designs in terms of availability. The individual component availabilities are given in the table below. Network Component Availability Info Router A = 0.96 Wired links A = 0.99 LoadBalancer A = 0.95 IndividualServer (Hardware + Software) A = 0.94 Design 1 Router Server Load Balancer Design 2 Router Server Load Balancer Server 2 (a) Compute the overallavailability of design l. () Compute the overall availability of design 2. (c) Which design can provide higher availability? Also discuss the trade-off. 5. A database server has been observed its availability of 0.92 including hardware and software. If the desired server availability is 99.5%, how can you achieve this availability by use of redundancy? Explain your answer using overall availability