Stevens Institute Of Technology

CS 550

Chapter 12 Networks and Data Communications An Overview

1)The sender and receiver end points, in a communications system, are referred to as

1. 1. hosts.
   2. end-users.
   3. edge devices.
   4. interface devices.

 

 

2. Since data communication is predominantly serial, we usually describe the data as a
   1. bit flow.
   2. bit surge.
   3. byte flow.
   4. byte stream.

 

 

3. To solve the related problems of channel availability and maximum utilization, there must be a way to break long messages into smaller units. These units are called
   1. boxes.
   2. packets.
   3. envelopes.
   4. containers.

 

4. A                          is equivalent to an envelope containing pages of data.
   1. packet
   2. message
   3. segment
   4. container

 

 

5. A direct USB connection between a smartphone and a personal computer is an example of
   1. multicast.
   2. broadcast.
   3. one-to-many connection.
   4. point-to-point connection.

 

 

6. The typical communication channel is actually divided into segments; connections along the segments are called
   1. links.
   2. routes.
   3. dedicated paths.
   4. transmission paths.

 

 

7. The rate of speed with which data can be moved successfully through the channel is usually measured as a
   1. bit rate.
   2. file rate.
   3. block rate.
   4. CPU cycle rate.

 

 

8. Which is not an example of an unguided medium?
   1. microwave
   2. cellular phone
   3. broadcast radio
   4. USB connection from computer to smartphone

 

 

9. Some channel characteristics are determined innately by the medium. For example, unguided messaging must be carried by an analog signal known as a
   1. shipping signal.
   2. carrier signal.
   3. delivery signal.
   4. transport signal.

 

 

10. Channels that carry messages in only one direction are known as

1. one-way channels.
2. simplex channels.
3. full duplex channels.
4. half-duplex channels.

 

 

11. Channels that carry messages in both directions, but only one direction at a time, are called

1. simplex channels.
2. one-way channels.
3. full-duplex channels.
4. half-duplex channels.

 

12. Channels that carry signals simultaneously in both directions are called

1. simplex channels.
2. one-way channels.
3. full-duplex channels.
4. half-duplex channels.

 

 

13. A relatively small number of standard protocols, consisting primarily of the        protocol suites, satisfy nearly all of the communication requirements for modern data communication networks.

1. TCP/IP and UDP
2. TCP/IP and BGP
3. TCP/IP and ATM
4. TCP/IP and Ethernet

 

 

14. In a                              topology each computer node gets every message, but processes only those addressed to that node. There is no central hub in this topology.

1. star
2. bus
3. ring
4. mesh

 

 

15. Which of the following topologies is used primarily for local area networks; all nodes are connected point- to-point to a central device that uses switching technology to connect pairs of nodes together?

1. star
2. bus
3. ring
4. mesh

 

 

16. Which of the following topologies consists of point-to-point connections from each node on the network to the next node; the last node on the network is connected back to the first and there is no central hub?

1. star
2. bus
3. ring
4. mesh

 

 

17. Which type of topology describes the actual layout of the wiring for the network?

1. virtual
2. logical
3. tangible
4. physical

 

 

18. Which type of topology defines the operational relationship between the various network components?

1. virtual
2. logical
3. physical
4. tangible

 

 

19. Which type of network connects computers and other supporting devices over a relatively small localized area, typically a room, the floor of a building, a building, or multiple buildings within close range of each other?

1. LAN
2. CAN
3. WAN

4. Intranet

 

 

20. The most familiar, and often most practical and useful, way to categorize networks is by their

1. geographical range of service.
2. medium used (coaxial cable, wireless, fiber).
3. standard specification number (802.3, 802.11, X.25).
4. usage (Web server, database server, peer-to-peer, storage area network).

 

 

21. In a(n)                                 hub, all of the connections at the hub are simply tied together inside the hub and the hub performs no operation or modification of the signals as they arrive at the hub.

1. active
2. layer 3
3. passive
4. intelligent

 

 

22. Which Ethernet technology uses radio-based signals to communicate to devices connected on the local area network?

1. Wi-Fi
2. ring Ethernet
3. mesh Ethernet
4. hub-based Ethernet

 

 

23. Which Ethernet type is based logically on a star topology and when one node on the network wishes to communicate with another node, the switch sets up a direct connection between the two?

1. Star Ethernet
2. Ring Ethernet
3. Mesh Ethernet
4. Switched Ethernet

 

 

24. Each wireless unit is connected by radio to a base station                                              that is somewhat equivalent to a hub.

1. media site
2. access site
3. media point
4. access point

 

 

25. Which type of network is used to interconnect local area networks? The primary motivation for this type of network is to improve overall performance of a larger network by creating separate local area networks for groups of users who communicate primarily with each other.

1. link networks
2. extended networks
3. connected networks
4. backbone networks

 

 

26. In a wireless network where the access points are connected by radio, the mesh points operate at the

                               and are essentially invisible to the upper layers of the network.

1. physical layer (layer 1)
2. transport layer (layer 4)
3. session layer 5 (layer 5)
4. media access control layer (layer 2)

 

27. Operation of a metropolitan area network (MAN) generally requires

1. access servers.
2. peering agreements.
3. right of way access.
4. fiber optic transmission.

 

 

28. An access router that is located between the public Internet and the internal LAN is called (a)n

1. edge router.
2. border router.
3. exchange router.
4. perimeter router.

 

 

29. Which type of network is designed to facilitate communications between users and applications over large distances—between the various corporate offices of an international organization that are located in cities all over the world, for example.

1. LAN
2. WAN
3. CAN
4. MAN

 

 

30. Which type of network has ranges of only thirty feet or less, but is sufficient for an individual to interconnect his personal computing devices?

1. PAN
2. LAN
3. WAN
4. CAN

 

 

31. How might a LAN be designed in a business setting to minimize extraneous traffic where possible?

1. Create separate LANs for each floor.
2. Create separate LANs for each manager.
3. Create separate LANs for each department.
4. Create separate LANs for each district or territory.

 

 

32. What makes virtual circuits more efficient in the use of transmission resources than traditional circuit switching?

1. Links and intermediate nodes are shared with other connections.
2. A virtual circuit uses multiple links to send data over possibly different channel paths.
3. There is a dedicated path for the exclusive use of the sender-receiver pair for the entire time of the connection.
4. There is a virtual path for the exclusive use of the sender-receiver pair for the entire time of the connection.

 

 

33. Which of the following is not true about datagram switching?

1. TCP/IP rarely uses datagram switching.
2. Each packet is routed from node to node independently.
3. A routing decision can be based on shortest path to next node.
4. A routing decision can be based on traffic conditions at the time of packet arrival.

 

 

34. How do routers and gateways differ?

1. Routers are used in ISPs; gateways are used in WANs.
2. There are no differences between routers and gateways.
3. Routers interconnect dissimilar networks together; gateways connect similar networks.