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1 . Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____
A. 3, 2, 1, none B. 3, 3, 1, 7
C. 3, 2, 1, 7 D. 3, 3, 2, none

2 . A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
A. Send a different source port number.
B. Decrease the window size.
C. Restart the virtual circuit.
D. Decrease the sequence number.

3 . Which of the following describe router functions?
A. All of the above
B. Packet switching
C. Packet filtering
D. Internetwork communication

4 . What is the purpose of flow control?
A. To regulate the size of each segment.
B. To provide a means for the receiver to govern the amount of data sent by the sender.
C. To reassemble segments in the correct order at the destination device.
D. To ensure that data is retransmitted if an acknowledgment is not received.

5 . What are the decimal and hexadecimal equivalents for the binary number 10110111?
A. 183/B7 B. 69/0x2102
C. 173/A6 D. 83/0xC5