What is the conceptual difference between IP and end-to-end protocols?
What will be an ideal response?
IP is incapable of supporting multiple applications because fields in the datagram header
only identify computers. That is, from IP’s point of view, the source and destination fields in a
datagram identify a host computer; an IP address does not contain additional bits to identify an
application program on the host. We say that IP treats a computer as an endpoint of communication.
In contrast, transport-layer protocols are known as end-to-end protocols because a transport protocol
allows an individual application program to be an endpoint of communication.
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List the four problems addressed by cryptography, and give a real-world example of each.
What will be an ideal response?
Which of the following statements concerning Photoshop help is false?
A. You must have Web browser software installed on your computer to view Photoshop Help information. B. Photoshop features an extensive Help system that you can use to access definitions, explanations, and useful tips. C. You need an Internet connection to use Photoshop Help. D. Help is stored as a .dict file on your desktop.