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41. 

The network layer, in reference to the OSI model, provide
A. data link procedures that provide for the exchange of data via frames that can be sent and received
B. the interface between the X.25 network and packet mode device
C. the virtual circuit interface to packet-switched service
D. All of the above
E. None of the above
42. 

In OSI network architecture, the routing is performed by
A. network layer
B. data link layer
C. transport layer
D. session layer
E. None of the above
43. 

Which of the following communications lines is best suited to interactive processing applications?
A. narrowband channels
B. simplex lines
C. full-duplex lines
D. mixed band channels
E. None of the above
44. 

What is the first octet range for a class B IP address?
A. 128 - 255
B. 1 - 127
C. 192 - 223
D. 128 - 191
E. 127 - 191
45. 

The 32-bit internet address 10000000 00001010 00000010 00011110 will be written in dotted decimal notation as
A. 148.20.2.30
B. 164.100.9.61
C. 210.20.2.64
D. 128.10.2.30
E. None of the above