Networking – Section 9

36. The frequency range : 300 kHz to 3 MHz is used for

A. AM radio transmission
B. FM radio transmission
C. TV transmission
D. microwave communications, satellite and radar
E. None of the above

Correct Answer: A. AM radio transmission

37. With an IP address of 201.142.23.12, what is your default subnet mask?

A. 0.0.0.0
B. 255.0.0.0
C. 255.255.0.0
D. 255.255.255.0
E. None of the above

Correct Answer: D. 255.255.255.0

38. A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?

A. Communications software
B. Error detecting protocols
C. Link access procedure (LAP)
D. Telecommunications
E.None of the above

Correct Answer: A. Communications software

39. IEEE project 802 divides the data link layer into an upper _____ sublayer and a lower _____ sublayer.

A. HDLC, PDU
B. PDU, HDLC
C. MAC, LLC
D. LLC, MAC
E. None of the above

Correct Answer: D. LLC, MAC

40. Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

A. one bit or any odd number of bits inverted in a block of data during transmission
B. two bits or any even number of bits inverted in a block during transmission
C. one bit or any odd number of bits inverted in a byte during transmission
D. two bits or any even number of bits inverted in a byte during transmission
E. None of the above

Correct Answer: D. two bits or any even number of bits inverted in a byte during transmission

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