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6Suppose a firewall is configured to allow outbound TCP connections but inbound connections only to specified ports. The FTP protocol now presents a problem: When an inside client contacts an outside server, the outbound TCP control connection can be opened normally but the TCP data connection traditionally is inbound.
(a) Look up the FTP protocol in, for example, Request for Comments 959. Find out how the PORT command works. Discuss how the client might be written so as to limit the number of ports to which the firewall must grant inbound access. Can the number of such ports be limited to one?
(b) Find out how the FTP PASV command can be used to solve this firewall problem.
In the example given in Fig. 1-17, the library procedure is called read and the system call itself is called read. Is it essential that both of these have the same name? If not, which one is more important?
Rubha Reidh (means Red Point in the local Gaelic language, sometimes seen spelt Rua Reidh and pronounced "roo-a ree") is a remote lighthouse on the west coast of Scotland. The lighthouse itself is now automated (as are all lighthouses in the UK) a..
Introduction: project name, a brief description of the project, and deliverables of the project.
Write a pseudocode statement that subtracts the variable downPayment from the variable total and assigns the result to the variable due. Don't use integer as decimal places will be needed.
Is management able to estimate the benefit of a revenue-generating system or must the system be built on faith? Why?
The project involves completing and extending the C++ program that evaluates statements of an expression language.
What are the main qualities to look for in an LCD monitor?
The GetUpperBound(0) function returns what information about an array?
Discuss the typical security vulnerabilities at each IB software and hardware level.
An unusual occurrence on the ARPANET
Explain the differences between server-side and client - side scripting languages. Please provide at least 3 advantages and disadvantages of each. Please cite your sources if needed.
In what ways does IT planning help managers exercise control in a situation? Does IT impact the truck driver of a company who delivers supplies to its customer?
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