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Alice and Bob use encryption for the confidentiality of their messages. However, they are concerned about their messages being tampered with by Trudy and whether it’s not Trudy they are communicating with rather than with each other. In this context answer the following questions: [5 points each] a) Can encryption alone address their confidentiality, integrity and authentication concerns? Explain your answer. b) Their network manager suggests that they use the Message Authentication Code (MAC). In this regard, explain which of the two concerns mentioned in part a) will MAC be able to address. c) What flaw in MAC prevents it from holding up in a court of law?  

VLANs provide network segmentation. The same functionality can be achieved with routers. Under what circumstances would a network administrator prefer a routed network to VLANs?

State true or false for each of these (no explanation required): a) If an Autonomous System (AS) learns of 4 different routes to a destination prefix, it need not announce all 4 to its neighbor.  b) The link layer is implemented in the hosts as well as the routers. c) Single bit parity cannot correct any error. d) 1000Base-T is the 1000 Mbps on fiber standard. e) In Bellman-Ford algorithm, the nodes share information about the neighbors with the world.  

Explain the CD feature of CSMA/CD protocol. How does this feature help this protocol achieve better efficiency than Slotted Aloha.

We watched videos in class about criminal cases involving adolescents. What is true about these cases?

Enlargement of the prostate gland that may be related to a disturbance of hormone secretions from the sex glands that occur as the period of reproductive activity declines is referred to as:

Which of the following ranges of kVp would be optimal for barium studies of the GI tract?

Which of the following pathologies is demonstrated by the white arrow in the following radiograph? #41.jpg

Long-term care costs are projected to increase dramatically in the 21st century.

Dementia is characteristic of normal aging.