What is the PPP (Point-to-Point Protocol), and how does it work?
What will be an ideal response?
ANSWER: PPP (Point-to-Point Protocol) is a Data Link layer protocol that directly connects two WAN endpoints. One example might be when a DSL or cable modem connects to a server at the ISP. PPP headers and trailers create a PPP frame that encapsulates Network layer packets. The frames total only 8 or 10 bytes, the difference depending on the size of the FCS field (recall that the FCS field ensures the data is received intact).
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An abstract class will:
a. Have all zeros in its vtable. b. Have at least one 0 in its vtable. c. Share a vtable with a derived class. d. Have fewer 0's in its vtable than concrete classes have.
In the accompanying figure, which selection would have been easiest to make using the Polygonal Lasso tool?
A. 1 B. 2 C. 3 D. 4
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