Chapter 2 Practice Test Answers
1. B. The OSI Model identifies a framework for standards without dictating specific
standards.
2. C. The Transport layer provides reliable delivery and retransmission of bad
packets.
3. C. The mesh topology connects every node to every other node, providing fault
tolerance and redundancy.
4. D. Asynchronous communication requires that a start and stop bit be passed from
sending to receiving machine to identify the beginning and end of a message.
5. C. A MAC address consists of six hexadecimal sections divided by colons.
6. B. The star topology is easiest to reconfigure because each node functions
independently of others.
7. C. The Transport layer is responsible for breaking messages into units that are a
usable size, for providing the sequencing, and for reassembling the messages at
their destination.
8. A. Digital transmission uses electrical pulses to transmit data.
9. B. Attenuation is the degradation of signal over distance.
10. C. Synchronous communication uses an imbedded clocking signal to indicate to
the receiving node the beginning and end of a message.
11. B & D. The Network layer provides the capacity for logical addressing and a
systematic way for messages to get from source node to destination node.
12. D. The Transport layer uses the ACK to verify successful delivery of a packet.
13. B. Gateways act as translators between different network environments.
14. A & D. The Presentation layer manages encryption and decryption as well as
compression and decompression as part of its functions.
15. A & D. The NIC works at both the Physical and Data Link layers of the OSI
Model.