Chapter 1

True/False

Indicate whether the statement is true or false.

____ 1. Two computers connected by a wire cable form a network.

____ 2. In 1954, the International Organization for Standardization (ISO) presented the Open Systems Interconnection

(OSI) model.

____ 3. Computers must use a common protocol to communicate properly.

____ 4. Peer communication allows error checking to occur on two separate layers simultaneously.

____ 5. Many LANs and WANs contain several segments. Dividing a network into segments reduces performance.

Multiple Choice

Identify the choice that best completes the statement or answers the question.

____ 6. The term ____ refers to the wire cabling, such as coaxial or the more commonly used twisted-pair, that form

the connections in most networks.

a. media c. server

b. EMI d. node

____ 7. ____ networks have computers that are servers and computers that act as clients to those servers.

a. EMI c. Peer-to-node

b. Peer-to-peer d. Client/server

____ 8. A ____ is contained within a company or department and located in a single geographic area, usually a

building or part of a building.

a. WAN c. SAN

b. LAN d. MAN

____ 9. A ____ spans multiple geographic areas and is usually connected by common telecommunication carriers.

a. LAN c. WAN

b. SAN d. MAN

____ 10. The term ____ refers to the intermediate stage between a LAN and a WAN.

a. SAN c. WAN

b. LAN d. MAN

____ 11. The term ____ refers to a series of storage devices, such as tapes, hard drives, and CDs, that are networked

together to provide very fast data storage for a network or subnetwork.

a. MAN c. SAN

b. WAN d. LAN

____ 12. The part of the company’s network that allows access to nonemployees is called the ____, which is accessed

over or through the Internet.

a. intranet c. publicnet

b. extranet d. privatenet

____ 13. The part of the company’s network that allows access to employees is called the ____, which is completely

separate from the Internet.

a. intranet c. SAN

b. LAN d. extranet

____ 14. The seven layers of the OSI reference model communicate with one another via ____ communication.

a. multicast c. peer

b. logical d. unicast

____ 15. The OSI model ____ layer defines the mechanical, electrical, and procedural events that occur during the

physical transmission of electronic signals on the wire.

a. Physical c. Data Link

b. Transport d. Network

____ 16. The ____ is information that is used to determine whether data was corrupted during transmission.

a. LLC c. MAC

b. CRC d. RPC

____ 17. The ____ sublayer of the Data Link layer defines how data is packaged for the network.

a. MAC c. CRC

b. RPC d. LLC

____ 18. The ____ sublayer of the Data Link layer defines the media access method and provides a unique identifier

for the network card.

a. MAC c. RPC

b. LLC d. CRC

____ 19. A(n) ____ address is a 48-bit address represented as a 12-digit hexadecimal number given to each network

card during production.

a. CRC c. LLC

b. RPC d. MAC

____ 20. Because the MAC address is added during the manufacturing process, it is a permanent marking. For this

reason, the address is also known as a ____.

a. NIC c. CRC

b. BIA d. CSMA/CD

____ 21. The protocols at the Network layer allow computers to route packets to remote networks using a ____

address.

a. burned in c. logical

b. BIA d. physical

____ 22. ____ protocols, such as TCP, require an acknowledgment (ACK) of the receipt of data packets.

a. Connectionless c. Application-layer

b. SYN d. Connection-oriented

____ 23. ____ protocols, such as User Datagram Protocol (UDP), do not require an ACK.

a. Presentation-layer c. Connectionless

b. Connection-oriented d. Network-layer

____ 24. Data sent by a connectionless transport is called a ____.

a. block c. cell

b. datagram d. package

____ 25. Each layer in a protocol stack may add a(n) ____ to the data as it is passed down the layers.

a. PDU c. CRC

b. MTU d. LLC

____ 26. A(n) ____, which is also known as a header or a trailer, is specific information that is sent from one layer on

the source computer to the same layer on the destination computer.

a. LLC c. PDU

b. MTU d. CRC

Completion

Complete each statement.

27. The term computer network, or simply ____________________, refers to the connection of two or more

computers by some type of medium.

28. In a client/server network, the ____________________ host the resources for the clients to use and provide

security.

29. A(n) ____________________ is a device that allows a computer or other device to connect to a network

through the media.

30. A(n) ____________________ is a network that uses a public communications infrastructure to facilitate

private communication between a company LAN and remote employees.

31. As the layers pass the data through the protocol stack, the addition of a header and/or trailer is called

____________________.

Matching

Match each item with a statement below:

a. EMI f. Networking software

b. Infrared g. Protocol

c. Peer-to-peer network h. OSI model

d. NOS i. Repeaters

e. Networking hardware

____ 32. term that describes all the physical components of a network

____ 33. a defined method for communicating between systems

____ 34. a wireless transmission media

____ 35. devices that boost the network signal

____ 36. allows communication, security, and distribution of data, files, and applications over a network

____ 37. frequently caused by nearby motors or fluorescent lighting

____ 38. the programs used to run a network

____ 39. when every computer on a network acts as both a client and a server

____ 40. developed as an industry standard for companies to use when developing network hardware and software to

ensure complete compatibility

Short Answer

41. Why do we use networks?

42. Describe various types of servers in a network.

43. What are virtual private networks?

44. What are the advantages of a layered networking model?

45. What are the responsibilities of the OSI model Physical layer?

46. What are the responsibilities of the OSI model Data Link layer?

47. What are the functions of the Network layer of the OSI model?

48. What are the responsibilities of the Transport layer of the OSI model?

49. What are the services provided by the Session layer of the OSI model?

50. What are the responsibilities of the Presentation layer of the OSI model