problem1. Describe four issues which are usually addressed in the Needs Analysis phase in building-block approach to network design.

problem2. Sketch a typical hybrid star-bus topology paying attention how the clients and switching hubs are connected.

problem3.

i) What do you understand by the term MTTR?

ii) Evaluate the annual downtime to the nearest hour if the accessibility of a network is 70%.

iii) Evaluate the percentage reliability of a system which suffers on average 4 failures per year over 30 days.

problem4. Describe fully the role of proxy server in network?

problem5. prepare down distinguish between each of the following:

i) Packet-level and application-level firewall

ii) IEEE 802.11g and IEEE 802.11a

problem6. Given eight disks, give the one probable array configuration that will provide maximum redundancy in each of RAID 0+1 and RAID 10 and show how stripes A, B, C, D, and E are written to each array. Give the total effective size of each array configuration when each disk has a size of 40 GB.