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Chapter
09 Computer Networks
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1. An end node is a device such as a workstation, server,
or printer that can be the source or destination of a message.
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2. A point-to-point transmission line is laid over the
shortest path and connected directly to both end nodes
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3. To connect four end nodes in a mesh technology, three
transmission lines and six connections per node are required.
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4. Mesh topology is practical for all but very small
networks.
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5. In a physical delivery system using store-and-forward,
the central nodes are transfer points located at or near the junction of
major roadways or air routes.
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6. The characteristics differentiating the physical
topologies include the length and routing of network cable, type of node
connections, data transfer performance, susceptibility of the network to
failure, and cost.
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7. Networks using bus and ring physical topologies are
commonly used today.
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8. Star topologies now dominate physical network topology
for wired networks.
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9. The OSI model predates the TCP/IP model by almost a
decade.
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10. The 32-bit addresses for an IP node are defined in
Internet Protocol version 6 (IPv6).
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11. Internet Protocol version 6 (IPv6) is an updated
version of IPv4 defined in the late 1990s and first deployed in the
mid-2000s.
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12. Guaranteeing service quality is a simple matter in
most IP networks.
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13. RARP converts IP addresses to physical network
addresses.
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14. The 802.1 and 802.2 standards correspond roughly to
the OSI Data Link layer.
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15. The marketplace ultimately decides which technologies
and products succeed.
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16. WiMAX is a replacement for and an extension to the
IEEE 802.11 standards.
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17. To date, most WiMAX adoption has occurred in urban
areas.
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18. Ethernet is a LAN technology, developed by Xerox in
the early 1970s, that’s closely related to the IEEE 802.3 standard.
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19. Newer Ethernet standards used a bus logical topology,
Category 5 twisted-pair cable, and CSMA/CD.
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20. 10 Gigabit Ethernet is based on the 802.3ae (2002) and
the 802.3ak (2004) standards.
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21. The term ____ refers to the spatial organization of
network devices, physical routing of network cabling, and flow of messages
from one network node to another.
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22. Most large-scale delivery services use a ____ system
to connect source and destination nodes.
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23. ____ topology is the path messages traverse as they
travel between end and central nodes.
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24. A ____ topology directly connects every node to a
shared hub, switch, or router.
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25. Each network covering a floor or building is called a
____.
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26. A ____ connects all LAN central nodes in a group of
buildings.
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27. A network for an entire campus is known as a(n) ____
and includes end nodes, LANs, zone networks, the campus backbone network, and
central nodes.
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28. If multiple nodes attempt to transmit across the same
medium at the same time, their messages mix, producing noise or interference
that’s called a ____.
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29. A ____ is a central connection point for nodes in a
LAN.
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30. A ____ intelligently forwards messages between two or
more networks.
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31. A wireless ____ connects a wireless network to a wired
network.
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32. The ____ layer includes communication protocols used
by programs that make and respond to high-level requests for network
services.
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33. The ____ layer ensures that data transmitted by one
network node is interpreted correctly by the other network node.
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34. The ____ layer forwards messages to their correct
destinations.
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35. The ____ layer is the interface between network
software and hardware.
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36. ____ is the glue that binds private networks together
to form the Internet and the World Wide Web.
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37. IP accepts messages called ____ from Transport-layer
protocols and forwards them to their destination.
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38. The written format of 128-bit IP addresses is called
____ notation.
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39. The term ____ describes transmission situations
involving multiple senders and receivers.
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40. ____ is a connectionless protocol that provides less
reliable transport services.
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41. ____ is a family of technologies and standards for
carrying voice messages and data over a single packet-switched network.
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42. The oldest and most widely used VoIP protocol suite is
____.
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43. VoIP equipment and software can be loosely divided
into two groups: end nodes and ____.
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44. In ____, the VoIP user perceives periods of silence
before the other participant’s speech is heard.
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45. The VoIP user perceives ____ as periods of silence
mixed with overlapped voice signals.
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46. The ____ model was originally intended to unite
disparate network standards in a way that enabled any node connected to any
type of network to communicate with any other node.
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47. At the sending node, the ____ layer’s role is to
translate IP datagrams into a format that can be transported and forwarded
over a specific physical network.
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48. ____ make forwarding decisions by using layer 2
addresses.
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49. ____ make forwarding decisions by using layer 3
addresses.
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50. ____ is based on the 802.3z standard and the 802.3ab standard.
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51. A(n) ____________________ topology is one in which
every node pair is connected by a point-to-point link.
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52. ____________________ is the physical placement of
cables and device connections to these cables.
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53. A(n) ____________________ topology directly connects
every node to a single shared transmission line.
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54. A(n) ____________________ topology directly connects
every node to two other nodes with a set of links forming a loop or ring.
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55. Each central node maintains a table of node addresses
and transmission lines or connection ports, called a(n) ____________________
table, and uses this table to make forwarding decisions.
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56. The procedure for forwarding a message between two end
nodes in the same LAN depends on the ____________________ network topology.
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57. Nodes sharing a common transmission medium follow a(n)
____________________ protocol to determine how to share the medium
efficiently.
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58. In CSMA/CA, a node that wants to transmit sends a(n)
____________________ signal.
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59. Like a hub, a(n) ____________________ generally has a
dozen or more input connections for computers and other network nodes.
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60. The ____________________ layer establishes and manages
communication sessions.
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61. The ____________________ layer formats messages into
packets suitable for transmission over the network.
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62. The ____________________ layer is where communication
between devices actually takes place.
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63. ____________________ are nodes connecting two or more
networks or network segments that might be implemented physically as
workstations, servers, or routers.
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64. The written format of 32-bit IP addresses is called
____________________ notation.
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65. IP is an example of a(n) ____________________
protocol, in which the sender doesn’t attempt to verify a recipient’s
existence or ask its permission before sending data.
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66. TCP connections are established through a(n) ____________________,
which is the combination of an IP address and a port number.
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67. A(n) ____________________ is a TCP connection with a
unique integer number.
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68. ____________________ embeds all or part of a datagram
in a physical network’s message format.
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69. The IEEE has drafted a number of network standards,
collectively referred to as the IEEE ____________________ standards.
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70. ____________________ is a group of wireless networking
standards developed by the WiMAX Forum and codified in the IEEE 802.16
standard.
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71. List and describe four physical topologies.
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73. Describe the application layer of the TCP/IP model.
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74. Describe the network interface layer in the TCP/IP
model.
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75. What are the call management functions that VoIP must
perform.
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