Networking 2012 test 3

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Networking test March 3, 2012 Study Guide
Networking 2012 test 3
Indicate whether the statement is true or false.
____ 1. The Application layer provides a set of interfaces for applications to access networked services, such as
networked file transfer, message handling, and database query processing.
____ 2. The PDU at the Application layer (and the Presentation and Session layers) is referred to simply as
____ 3. Encoding is the representation of 0s and 1s as a physical signal, such as electrical voltage or a light pulse.
____ 4. A packet is the basic unit for network traffic as it travels across the medium.
____ 5. The frame’s destination address of a broadcast frame is a value of all binary 0s.
____ 6. Internet Protocol version 4 (IPv4), or just IP, is a Transport layer protocol that provides source and destination
addressing and routing for the TCP/IP suite.
____ 7. Class A addresses are intended for use by large corporations and governments.
____ 8. The act of supernetting “borrows” bits from the network portion of an IP address to “lend” those bits to the
host portion.
____ 9. Combining two or more small networks into one larger network is one reason to subnet.
____ 10. Although installing several protocols on a machine to ensure interoperability with any operating system might
be tempting, adding unnecessary protocols can have a detrimental effect on network performance.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 11. In the OSI reference model, the ____ layer is layer 6.
a.Data Link c.Presentation
b.Application d.Session
____ 12. In the OSI reference model, the ____ layer is layer 3.
a.Physical c.Data Link
b.Transport d.Network
____ 13. In the OSI reference model, the ____ layer is layer 4.
a.Session c.Data Link
b.Transport d.Network
____ 14. Domain Name System (DNS) and NetBIOS name resolution both work in part at the ____ layer.
a.Session c.Presentation
b.Network d.Transport
Name: ________________________ ID: A
____ 15. ____ is the process whereby a device receives a packet destined for another network, determines the best way
to get the packet to its destination, and then forwards the packet out of one of its other network interfaces.
a.Switching c.Encapsulation
b.Routing d.Forwarding
____ 16. Access control is handled at the ____ layer during the routing process; the router consults a list of rules before
forwarding an incoming packet to determine whether a packet meeting certain criteria (such as source and
destination address) should be permitted to reach the intended destination.
a.Data Link c.Application
b.Transport d.Network
____ 17. The PDU at the Data Link layer is called a ____.
a.message c.frame
b.segment d.packet
____ 18. The PDU at the Network layer is called a ____.
a.message c.frame
b.segment d.packet
____ 19. The PDU at the Transport layer is called a ____.
a.message c.frame
b.segment d.packet
____ 20. The job of the ____ to convert bits into signals for outgoing messages and signals into bits for incoming
a.Data Link layer c.MAC sublayer
b.LLC sublayer d.Physical layer
____ 21. ____ is Novell’s protocol for packet routing and forwarding.
a.IP c.SPX
____ 22. ____ is a nonroutable protocol.
b.IP d.SPX
____ 23. ____ is Novell’s connection-oriented protocol used to guarantee data delivery.
a.AppleTalk c.TCP
____ 24. IP is a ____ protocol.
a.reliable c.connection-oriented
b.nonroutable d.connectionless
____ 25. TCP is a(n) ____ protocol.
a.unreliable c.connection-oriented effort d.connectionless
____ 26. ____ uses TCP as its transport protocol.
Name: ________________________ ID: A
____ 27. An IP address is divided into two distinct parts: one part designates the logical network the computer is a part
of, while the remainder of the address represents the ____.
a.NIC’s MAC address ID
b.domain name d.subnet mask
____ 28. Class ____ addresses are reserved for experimental use and cannot be used for address assignment.
a.A c.D
b.C d.E
____ 29. The reserved name localhost always corresponds to the IP address ____.
a. c.
b. d.
____ 30. A subnet mask is a ____-bit number that’s always assigned to a host when the IP address is assigned.
a.16 c.64
b.32 d.128
____ 31. The default Class C subnet mask is ____.
a. c.
b. d.
____ 32. An IPv6 address is ____ bits long.
a.32 c.128
b.64 d.256
____ 33. ____ is the message format that DOS and Windows use to share files, directories, and devices.
b.NetBIOS d.Samba
____ 34. AppleTalk divides computers into ____.
a.zones c.groups d.subnets
Complete each statement.
35. OSI stands for ______________________________.
36. The OSI reference model was proposed by the _____________________________________________
37. PDU stands for ____________________.
38. The trailer component labeled as“FCS” (frame check sequence) contains an error-checking value called a(n)
_________________________ (CRC).
39. LLC stands for ____________________.
40. MAC stands for ____________________.
Name: ________________________ ID: A
41. The most common protocol stack is Transmission Control Protocol/Internet Protocol (TCP/IP), which is the
____________________ protocol suite.
42. ______________________________ (TCP) is the primary Internet transport protocol.
43. A(n) ____________________ is a grouping of eight binary digits or bits usually expressed as a decimal
44. The network beginning with 127 is called the ____________________ address.
45. ____________________ is the process of dividing a single network address into two or more subnetwork
addresses, each with fewer available host IDs than the original network address.
46. An extension of NAT, called ____________________ (PAT), allows several hundred workstations to access
the Internet with a single public Internet address.
47. ____________________ (QoS) is a term that describes a network’s capability to prioritize data packets, based
on the type of information they contain (for example, voice, video, or file data) or the urgency of the
Short Answer
48. What is encapsulation?
49. What does a frame header usually contain?
50. What does the data section of a frame contain?
51. What does a frame trailer contain?
52. Describe the process that occurs as data moves down through the OSI model.
53. What is the role of the LLC sublayer?
54. What is the role of the MAC sublayer?
55. What is the role of the Application layer of the OSI reference model?
56. What is the role of the Presentation layer of the OSI reference model?
57. What is the role of the Session layer of the OSI reference model?
58. What kinds of problems can occur at the Transport layer of the OSI reference model?
59. What is connectionless data delivery?
60. What is a connection-oriented protocol?
Name: ________________________ ID: A
61. What is ICMP?
62. How does TCP establish a connection?
63. What is UDP? Mention some of its characteristics.
64. What is HTTP?
65. What is FTP?
66. What is the role of Class D IP addresses?
67. What are IP’s reserved addresses that cannot be routed across the Internet?
68. What are the advantages of subnetting?
69. Why is NAT used?
70. How does DHCP work?