Online Notes and Lectures: MCQs Answers

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Thursday, April 3, 2014

Security in the Internet: IPSec, SSL/TLS, PGP, VPN, and Firewalls - MCQs Answers

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Answers key for Security in the Internet: IPSec, SSL/TLS, PGP, VPN, and Firewalls

Below are the answers key for the Multiple Choice Questions (Quiz) in Security in the Internet: IPSec, SSL/TLS, PGP, VPN, and Firewalls .

1. IPSec

2. IPSec

3. ESP

4. PGP

5. both SSL and TLS

6. three

7. AH; ESP

8. transport

9. IKE

10. private

11. all of the above

12. none of the above

13. extranet

14. IPSec

15. all of the above

16. SADB

17. intranet

18. TLS; SSL

19. X509

20. cipher suite

21. VPN

22. PGP

23. transport

24. PGP

25. PGP

26. AH

27. PGP

28. both SSL and TLS

29. both SSL and TLS

30. transport

31. tunnel

32. PGP

33. transport

34. public

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Data Communications and Networking (Chapter Quiz)

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Network Security - MCQs Answers

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Below are the answers key for the Multiple Choice Questions (Quiz) in Network Security .

1. integrity

2. authentication

3. hash

4. session

5. weak-collision-resistance

6. KDC

7. all of the above

8. keyless

9. KDC

10. Entity authentication

11. conventional; digital

12. confidentiality

13. both authentication and nonrepudiation

14. confidentiality

15. MAC

16. message digest

17. all of the above

18. strong-collision-resistance

19. asymmetric-key

20. CA

21. confidentiality

22. challenge-response

23. entity authentication

24. one-wayness

25. CA

26. Nonrepudiation

27. three

28. Kerberos

29. fixed; one-time

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Data Communications and Networking (Chapter Quiz)

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Cryptography - MCQs Answers

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Below are the answers key for the Multiple Choice Questions (Quiz) in Cryptography .

1. RSA

2. decryption

3. ciphertext

4. encryption

5. Diffie-Hellman

6. S-box

7. substitution

8. transposition

9. AES

10. plaintext

11. round

12. man-in-the-middle

13. cipher

14. private

15. three

16. symmetric-key

17. 48-bit

18. shift

19. block

20. P-box

21. Triple

22. Cryptography

23. 16

24. 4

25. symmetric-key

26. Substitution

27. shift

28. public

29. asymmetric-key

30. key

31. symmetric-key

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Data Communications and Networking (Chapter Quiz)

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Multimedia - MCQs Answers

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Below are the answers key for the Multiple Choice Questions (Quiz) in Multimedia .

1. H.323

2. synchronization source

3. RTP

4. delay between packets

5. multicast

6. a UDP user datagram

7. translator

8. MPEG

9. multicasting

10. Sequence numbers

11. data compression

12. quantization

13. both timestamp and sequence number

14. jitter

15. Mixing

16. more than 10

17. Streaming live

18. Translation

19. JPEG

20. playback

21. predictive

22. Perceptual

23. Interactive

24. two

25. SIP

26. TCP

27. UDP

28. three

29. UDP

30. Streaming stored

31. RTCP

32. mixer

33. timestamp

34. DCT transformation

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Data Communications and Networking (Chapter Quiz)

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Wednesday, April 2, 2014

WWW and HTTP - MCQs Answers

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Below are the answers key for the Multiple Choice Questions (Quiz) in WWW and HTTP .

1. POST

2. protocol

3. dynamic

4. Java applets

5. server; server

6. static

7. URL

8. The WWW

9. HTTP version number

10. client-site

11. TCP

12. server-site

13. active

14. proxy

15. HEAD

16. a status line and a header

17. none of the above

18. an active

19. three

20. HTML

21. CGI

22. GET

23. persistent

24. a request line and a header

25. nonpersistent

26. path

27. host

28. persistent

29. none of the above

30. distributed

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Data Communications and Networking (Chapter Quiz)

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Remote Logging, Electronic Mail, and File Transfer - MCQs Answers

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Answers key forRemote Logging, Electronic Mail, and File Transfer

Below are the answers key for the Multiple Choice Questions (Quiz) in Remote Logging, Electronic Mail, and File Transfer .

1. two UAs, two pairs of MTAs, and a pair of MAAs

2. MTAs

3. DO

4. two UAs and two pairs of MTAs

5. envelope

6. data; control

7. file type

8. pull

9. none of the above

10. character

11. pseudoterminal driver

12. TCP

13. NVT ASCII

14. store a file

15. as many times as necessary

16. minimize delay

17. remote

18. MAA

19. a well-known; an ephemeral

20. 1

21. SMTP

22. MIME

23. all are

24. WILL

25. retrieve file and retrieve list

26. terminal network

27. local

28. header

29. none of the above

30. A UA

31. header; body

32. line

33. content-description

34. WONT

35. push

36. transmission modes

37. 0

38. TELNET server

39. two UAs

40. local part; domain name

41. IAC

42. two UAs and one pair of MTAs

43. exactly once

44. DONT

45. TELNET client

46. POP3; IMAP4

47. general-purpose

48. data structures

49. none of the above

50. 21; 20

51. default

52. command-driven; GUI-based

53. IMAP4; POP3

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Data Communications and Networking (Chapter Quiz)

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Domain Name System - MCQs Answers

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Below are the answers key for the Multiple Choice Questions (Quiz) in Domain Name System .

1. dots

2. secondary

3. none of the above

4. PQDN

5. zone

6. either UDP or TCP

7. chal

8. an empty string

9. zone

10. root server

11. inverse

12. label; 63

13. domain name space

14. generic

15. hierarchical

16. flat

17. inverse

18. country

19. domain

20. an inverted-tree

21. FQDN

22. three

23. iterative

24. edu

25. fifth

26. recursive

27. primary

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Data Communications and Networking (Chapter Quiz)

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Congestion Control and Quality of Service - MCQs Answers

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Answers key for Congestion Control and Quality of Service

Below are the answers key for the Multiple Choice Questions (Quiz) in Congestion Control and Quality of Service .

1. Delay

2. peak data rate

3. committed information rate

4. open-loop

5. congestion control

6. Reliability

7. declines sharply

8. weighted fair

9. UBR

10. maximum burst size

11. closed-loop

12. Congestion

13. slow-start

14. access rate

15. congestion detection

16. Integrated Services

17. constant bit rate

18. Jitter

19. choke packet

20. ABR

21. variable bit rate

22. implicit signaling

23. increases sharply

24. backpressure

25. priority

26. FIFO

27. four

28. excess burst size

29. increases proportionally with the load

30. explicit signaling

31. at a minimum

32. queues

33. quality of service

34. BECN

35. FECN

36. effective bandwidth

37. congestion avoidance

38. VBR

39. descriptors

40. Differentiated Services

41. leaky

42. token

43. CBR

44. bursty

45. committed burst size

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Data Communications and Networking (Chapter Quiz)

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Process-to-Process Delivery: UDP, TCP, and SCTP - MCQs Answers

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Answers key for Process-to-Process Delivery: UDP, TCP, and SCTP

Below are the answers key for the Multiple Choice Questions (Quiz) in Process-to-Process Delivery: UDP, TCP, and SCTP .

1. control

2. sliding

3. transport

4. half-close

5. control chunk

6. association

7. no

8. a unique verification tag

9. a TSN

10. randomly generated number

11. application

12. multistream

13. connection-oriented

14. multiplexing

15. uses buffers

16. multiple IP addresses

17. port

18. before

19. reliable

20. no

21. 4

22. none of the above

23. stream; stream

24. SSNs

25. dynamic

26. process-to-process

27. socket address

28. 40

29. 16

30. none of the above

31. mandatory

32. one

33. an acknowledgment mechanism

34. no; are not

35. only data chunks

36. the process running on the sending computer

37. Flow

38. two

39. the receiver

40. first

41. several data chunks

42. User Datagram Protocol

43. none of the above

44. segment

45. both a and b

46. none of the above

47. an IP datagram

48. 32

49. byte

50. piggybacking

51. 199

52. an IP datagram

53. stream-oriented

54. user datagrams

55. IP

56. different chunks

57. segments; packets

58. process-to-process

59. control chunks

60. full-duplex

61. reliable, message-oriented

62. an SI

63. process-to-process communication

64. host-to-host; process-to-process

65. SYN flooding

66. connectionless, unreliable

67. no other chunk

68. 8

69. denial of service

70. a transport layer protocol takes over

71. next

72. one

73. cumulative

74. port addresses

75. client-server

76. finite state

77. demultiplexing

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Data Communications and Networking (Chapter Quiz)

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Tuesday, April 1, 2014

Network Layer: Delivery, Forwarding and Routing - MCQs Answers

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Answers key for Network Layer: Delivery, Forwarding and Routing

Below are the answers key for the Multiple Choice Questions (Quiz) in Network Layer: Delivery, Forwarding and Routing .

1. an indirect

2. physical and data link

3. Flooding

4. group-shared

5. none of the above

6. interdomain routing

7. source-based

8. multicasting

9. DVMRP

10. shortest

11. RPM

12. distance vector

13. graft

14. one copy

15. multicasting; multiple unicasting

16. data-driven

17. broadcast

18. OSPF

19. broadcast

20. autonomous systems

21. RIP

22. with manual entries

23. classless addressing

24. host-specific

25. distance vector

26. An autonomous system

27. only the core router is

28. stub

29. RPM; RPB

30. none of the above

31. link state

32. shortest

33. MBONE

34. Routing

35. open

36. link state

37. none of the above

38. dynamic

39. multicast

40. unicast

41. static

42. dense

43. its immediate neighbors

44. intradomain routing

45. shortest

46. path vector

47. BGP

48. point-to-point

49. next-hop

50. network-specific

51. RPM

52. switching fabrics

53. a direct

54. default

55. source-based

56. reduce

57. distance vector

58. source-based

59. which is updated automatically

60. unicasting

61. transient

62. link state

63. part of an AS

64. longest mask matching

65. sparse

66. network

67. prune

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Data Communications and Networking (Chapter Quiz)

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Network Layer: Address Mapping, Error Reporting, and Multicasting - MCQs Answers

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Answers key for Network Layer: Address Mapping, Error Reporting, and Multicasting

Below are the answers key for the Multiple Choice Questions (Quiz) in Network Layer: Address Mapping, Error Reporting, and Multicasting .

1. 2

2. a group management

3. the destination IP address in the datagram header

4. 0x000000000000

5. two membership reports are

6. special query message

7. An ICMP error message may be generated only for the first fragment.

8. IP

9. router; host or router

10. static mapping

11. one source; multiple destinations

12. broadcast

13. the IP address of the router found in the routing table

14. group address

15. proxy ARP

16. physical

17. the IP address of the router found in the routing table

18. the destination IP address in the datagram header

19. locally

20. multicast

21. does not define a particular

22. proxy ARP

23. none of the above

24. network

25. unicast

26. ARP

27. query and error reporting messages

28. an 8-byte

29. IP

30. none is true

31. tunneling

32. multicast group

33. logical

34. twice

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Data Communications and Networking (Chapter Quiz)

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Network Layer: Internet Protocol - MCQs Answers

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Answers key for Network Layer: Internet Protocol

Below are the answers key for the Multiple Choice Questions (Quiz) in Network Layer: Internet Protocol .

1. hop limit

2. there are 40 bytes in the header

3. there are 40 bytes in the header

4. flow label

5. 428

6. best-effort delivery

7. IP

8. 39,952

9. Offset number and total length

10. is 20 to 60 bytes long

11. priority

12. Fragment offset = 1000

13. Base header

14. MTU

15. base header; upper-layer data

16. The identification field is the same for all three datagrams.

17. the first byte of the datagram is byte 800

18. an unreliable and a connectionless

19. more

20. differentiated services

21. none of the above

22. is 20 to 60 bytes long

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Data Communications and Networking (Chapter Quiz)

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Network Layer: Logical Addressing - MCQs Answers

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Answers key for Network Layer: Logical Addressing

Below are the answers key for the Multiple Choice Questions (Quiz) in Network Layer: Logical Addressing .

1. A

2. 12.0.0.0

3. provider-based unicast

4. 256

5. 256

6. mask

7. 15

8. a unicast

9. 14

10. 7

11. none of the above

12. D

13. /8

14. 12.2.2.112

15. /16

16. B

17. site local

18. a multicast

19. must be a power of 2

20. 4

21. an anycast

22. 8

23. 16

24. /24

25. /24

26. 8: 4

27. /18

28. 32

29. 255.148.0.0

30. hexadecimal colon

31. 255.254.0.0

32. 32

33. none of the above

34. suffix

35. 2.4.6.0

36. 0

37. 12.2.2.64

38. 32

39. prefix

40. 128

41. 16,777,216

42. 12.2.2.7

43. 2.4.6.64

44. link local

45. 64

46. A

47. must be evenly divisible by the number of addresses

48. mapped

49. 65,536

50. 12.2.2.127

51. type

52. 255.255.255.0

53. 16

54. 8

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Data Communications and Networking (Chapter Quiz)

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Sunday, October 20, 2013

Answers key: Gibilisco - CHAPTER 1 MCQs

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Answers key: Gibilisco - CHAPTER 1 Basic Physical Concept MCQs

Explanations for the Answers in Chapter 1: Basic Physical Concept Quiz

1. An electrically neutral atom has no net electric charge, so the number of positively charged particles (protons) must equal the number of negatively charged particles (electrons). The correct answer is (c).
2. This question contains a distraction! The correct answer is (a). By definition, the atomic number of any atom, whether neutral or not, equals the number of protons in its nucleus.
3. Once again, I've inserted a distraction. The correct answer is (d). That's how we define atomic weight for any atom, electrically neutral or otherwise.
4. When an atom has an electric charge, we call it an ion. By definition, a positive ion is a cation. The correct answer is (b).
5. A carbon atom always has six protons, so we can rule out (c) and (d) straightaway. In the chapter text, we identify two different isotopes of carbon. One isotope (C12) has six neutrons, and the other (C14) has eight neutrons. The correct answer is (a).

6. The correct answer is (c), because we define a two-atom molecule as diatomic. Some molecules, such as O₂, have two atoms, so we can rule out (a). Molecules can have electric charge because they, like atoms, can have an excess or deficiency of electrons, so we can rule out (b). The number of protons in a molecule need not equal the number of neutrons (and often doesn't), so we can rule out (d).
7. A compound always contains two or more atoms. A monatomic element has single atoms (meaning that none of its atoms are bound to any other atoms) by definition, so we'll never encounter a monatomic compound. The correct answer is (a).
8. When a substance becomes ionized, its atoms acquire extra electrons or lose some of their electrons. The nucleus doesn't change at all. In the chapter text, we learned that ionization sometimes makes poor conductors into good conductors, so the correct answer is (a).
9. In the chapter text, we learned that pure elemental silver is the best known electrical conductor. The correct answer is (d).
10. The correct answer is (b). In the chapter text, we learned that in most gases, the atoms are too widely separated to allow for the easy passage of electrons from atom to atom. You might think that (c) is also correct, but it isn't. The electrons certainly do move in a gas! They "orbit" their "parent nuclei" at great speed (as they do in all atoms), even though they don't readily move from one atomic nucleus to another.
11. In the chapter text, we learned that if we impose a potential difference of 1 V across a component having a resistance of 1 ohm, we get 1 A of current. We also learned that if we double the voltage across a component whose resistance remains constant, we double the current. Therefore, the correct answer is (c).
12. Once again, if we double the voltage but leave the resistance unchanged, we double the current. The correct answer is (c).
13. We can define a hole as a place where we would normally expect to find an electron, but for some reason the electron isn't there. Holes don't have anything to do with protons, neutrons, or the existence of electron shells. The correct answer is therefore (a).
14. The correct answer is (a). All good conductors have low resistance. Answer (d) doesn't work, because no conductor exhibits zero resistance in the "real world." Answer (b) is absolutely wrong! You might feel the temptation to choose (c), but that statement applies to semiconductors, not to good conductors in general.
15. The number of electrical charge carriers on an object constitutes the quantity of its charge. We express that parameter in coulombs, so the correct answer is (d).
16. When a lightning stroke occurs, a potential difference is equalized by a flow of electrons from atom to atom through ionized air. The general direction of electron movement is away from the negative pole and toward the positive pole. The correct answer is (b).
17. The chapter text tells us that engineers express resistance in ohms. As the value in ohms increases, so does the resistance. The correct answer is (d).
18. A battery stores chemical energy. If we connect a component across the battery terminals so that current flows, the battery converts chemical energy to electrical energy. The correct answer is (b). Generators convert mechanical energy to electrical energy, so (a) is wrong. Motors convert electrical energy to mechanical energy, so (c) doesn't work. Obviously, answer (d) is wrong then!
19. A generator converts mechanical energy to electrical energy, so the correct answer is (a). Batteries convert chemical energy to electrical energy, so (b) is wrong. Motors convert electrical energy to mechanical energy, so (c) is wrong. Answer (d) is of course wrong because we've already found that answer (a) works.
20. No generator, battery, or motor can convert electrons into protons, so the correct answer is (d). Nobody has ever built a device that can change an electron directly into a proton.