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Question1. Consider Figure 5.26. Assume that all links are one hundred Mbps. Determine the maximum total aggregate throughput that can be achieved among the 9 hosts and 2 servers in the network? You can assume that any host or server can send to any other host or server. Why?
Question2. In this problem, we explore the use of small packets for Voice-over IP applications. One of the drawbacks of a small packet size is that the large fraction of link bandwidth is consumed by overhead bytes. To this end, suppose that the packet consists of P bytes and 5 bytes of header.a. Consider sending a digitally encoded voice source directly. Suppose the source is encoded at a constant rate of 128 kbps. Assume each packet is entirely filled before the source sends the packet into the network. The time required to fill a packet is the packetization delay. In terms of L, determine the packetization delay in milliseconds.b. Packetization delays greater than 20 msec can cause a noticeable and unpleasant echo. Determine the packetization delay for L = 1,500 bytes (roughly corresponding to a maximum-sized Ethernet packet) and for L = 50 (corresponding to an ATM packet).c. Calculate the store-and-forward delay at a single switch for a link rate of R = 622 Mbps for L = 1,500 bytes, and for L = 50 bytes.d. Comment on the advantages of using a small packet size.
When a process first start execution, how would you characterize the page fault rate? Once the working set for a process is loaded into memory, how would you characterize the page fault rate?
Consider a dynamic RAM that must be given a refresh cycle 64 times per ms. What percentage of the memory's total operating time must be given to refreshes?
The final security measure my company implements well is monitoring internet usage through limiting the access for most workers to search websites that are not related to the company.
Illustrate how many page faults are generated by following array-initialization loops, using LRU replacement, and assuming page frame 1 has process in it, and the other two are initially empty?
Discuss at least ten Vulnerabilities in VoIP. Briefly explain each of the listed vulnerability, along with a possible recommendation for a countermeasure.
Suppose you have been hired by a mail order firm to install a backbone structure that will connect four LANs and provide a connection to the Internet.
Write a multi-threaded program to solve producer and consumer problem
Remembering that there's a trade-off between memory use. Then give an example where doing so will cause throughput to suffer.
1st national banks president congratulates you on successfully managing her network's addressing issues. She then shares the data that she's about to make an offer to buy Monroe's other banks, Metropolitan savings.
Formulate the linear programming model for this problem Plot a graph indicating and labelling clearly all the constraints, the feasible region (R) and the optimal point (X)
Qqueue for service (if the server process is busy servicing another request). Requests in queue are served according to the scheduling policy in use: First-In-First-Out (FIFO) scheduling.
Will IBM's plan to give away some of its IT assets and intellectual property and increase its support of opensource software products like Linux be a successful growth strategy in the "brutally competitive marketplace" in which it operates?
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