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Q1) Suppose you wish to close a bank branch and introduce a teller machine. Your company has won the tender to develop an application-level protocol to be used between an automatic teller machine and a bank's centralized computer. There are the following requirements that must be satisfied:
Your protocol should allow a user's card and password to be verified, the account balance (which is maintained at the centralized computer) to be queried, and an account withdrawal to be made.
Your protocol entities should be able to handle the all-too-common case in which there is not enough money in the account to cover the withdrawal.
Your tasks are as follows:
a. Specify your protocol by listing the different messages that will be used by your application layer protocol. You must clearly specify the contents of each message by providing the message structure. Using a timing diagram provide a figure that shows the operation of your protocol for the case of a simple withdrawal with errors (i.e., insufficient balance).
Should the viewing or monitoring of social networking cites be considered an appropriate method for preliminary employment screening and continued employment with organizations?
Users are familiar with some network services like HTTP (Hypertext Transport Protocol) - Web, NNTP (Network News Transport Protocol). How do they figure into organizational security?
Research network address translation (NAT). While conducting your research, consider purpose of NAT, compatibility with IPv6, and functions of automatic IP assignment and automatic name resolution.
Locate two such organizations. For each of the two, identify the need or opportunity that prompted the decision to have a physical presence.
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Terminal A is sending data to terminal B using a sliding window protocol with the window size equal to 5 and the maximum sequence number equal to 6.
Suppose there is a 10 Mbps microwave link between a geostationary satellite and its base station on earth. What is the propagation delay of the link?
Write down the advantages of some of the current technologies including VoIP, Unified Communications, Virtual Private Networks.
Explain to your team the differences between routers and switches. Compare them and list the pros and cons of using each type of hardware.
For each of the following attacks, say whether the attack can be detected and mitigated (to a significant degree) by a stateless or stateful firewall. Explain briefly.
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