Internet Terminology Confusions/Network

1. Why does the Internet need HTTP, TCP, IP and DNS? Why isn’t the Internet Protocol (IP) enough to do the job? Please reply to these specific points of confusion. 2. Another thing that puzzles me is that sometimes when I type a uniform resource locator (URL), I was told that the host named in the URL does not exist. Yet often this is a host name I have been using successfully for months or even years. What is going on? Thanks in advance for helping me answer these questions.

VPN vs Dial-up

Describe the difference between virtual private network (VPN) remote access and dial-up.

Security protocols

Security protocols from IP layer (e.g., IPSec) to application layer (e.g. XML and S/MIME). Are they redundant? Is it possible to design a universal security solution at one layer? Provide arguments to support your viewpoint.

How much more secure is given double encryption when compared with either of the constituent single encryption substitution ciphers?

Consider two substitution ciphers. One adds a value of i to the ASCII code of the plaintext character. The other adds a value of j to the plaintext character. All additions are modulo 256. Now consider a double-encryption method that adds i to each plaintext character and then adds j to the resulting ciphertext character to get another ciphertext character. Again, all calculations are modulo 256. How much more secure is this double encryption when compared with either single-encryption method?

Security and Group Policy

Your team has been hired by a large restaurant called Habibi’s. Habibi’s has now grown into a national chain with hundreds of locations. Each location has one Windows Server 2003 and many Windows XP desktop computers. Your job is to set up the Windows Server 2003 so as to standardize operations so that software can be automatically deployed, servers can be remotely administered. Server files are backed up and provisions are made for disaster recovery. Desktop computers that use Windows XP should also be remotely supported. For the benefit of management explain the advantages and disadvantages of several group policies that would increase security for Habibi’s. How far should mana... click for more