Which of the following statements best describes the preamble of an Ethernet frame?
A. It contains the CRC.
B. It includes a 7-byte series of alternating ones and zeroes followed by a 1-byte Start Frame.
C. It contains the MAC address of the source and the destination.
D. It contains the IP address of the source and the destination and is used by routers to deliver the frame to the proper location.
Answer: B
You might also like to view...
To add a new procedure, module, or class module, click ____ on the menu bar in the Code window, and then click Procedure, Module, or Class Module.
A. Add B. Create C. Insert D. Build
What does it mean when we say a programmer using a function should be able to treat the function like a black box?
a) This is meaningless. One must know how a function does its job to effectively use it. b) One must be able to rely on the description of the preconditions (requirements for use of the function) and the postconditions (promise of behavior to use the function). c) If one codes an application that uses a function with a knowledge of the internal mechanism of that function, then when the function’s maintainer changes its internal mechanism, the application programmer could be faced with changing the application code extensively. d) The most efficient programs are the ones that each function is designed to maximally use the internal behavior of every other function to speed up the code.
Is there any output from sleep? Where does cat get its input from? What has to happen before the shell will display a prompt?
Enter the following command: $ sleep 30 | cat /etc/services
Pressing and holding [shift] when you select cells lets you select nonadjacent cell ranges.
Answer the following statement true (T) or false (F)