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280 networking > Chapters 5 - 9 > Flashcards

Chapters 5 - 9 Flashcards

1
Q

50: (p.38) What is layer 7 of the OSI model?

A

application

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2
Q

51: (p.38) What layer number is the Application layer of the OSI model?

A

7

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3
Q

52: (p.38) What is layer 6 of the OSI model?

A

presentation

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4
Q

53: (p.39) What layer number is the Presentation layer of the OSI model?

A

6

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5
Q

54: (p.39) At which OSI layer is encryption / decryption?

A

6 or presentation

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6
Q

55: (p.39) At which OSI layer is data compression?

A

6 or presentation

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7
Q

56: (p.39) What is layer 5 of the OSI model?

A

session

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8
Q

57: (p.39) What layer number is the Session layer of the OSI model?

A

5

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9
Q

58: (p.40) What is layer 4 of the OSI model?

A

transport

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10
Q

59: (p.40) What layer number is the Transport layer of the OSI model?

A

4

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11
Q

60: (p.40) What does MTU stand for?

A

maximum transmission (or transfer) unit

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12
Q

61: (p.40) What is the typical value for MTU (in bytes)?

A

1500

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13
Q

62: (p.41) At which OSI layer are software ports?

A

4 or transport

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14
Q

63: (p.41) What does TCP stand for?

A

transmission control protocol

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15
Q

64: (p.41) Which protocol provides for guaranteed delivery of information?

A

TCP, or Transmission Control Protocol
TCP, the Transmission Control Protocol, provides guaranteed delivery through
retransmission as needed.

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16
Q

65: (p.41) At which OSI layer is TCP?

A

4 or transport
TCP is suitable for le transmission where accuracy is more important than
avoiding delays.

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17
Q

66: (p.41) Which protocol provides for fast (but not guaranteed) delivery of
information?

A

UDP, or User Datagram Protocol
UDP, the User Datagram Protocol, provides fast delivery but does not guar-
antee delivery.

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18
Q

67: (p.42) What does UDP stand for?

A

user datagram protocol
UDP is suitable for live voice, live sound, and live video, where avoiding
delays is more important than absolute accuracy, and dropped data can
usually be ignored.

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19
Q

68: (p.42) At which OSI layer is UDP?

A

4 or transport

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20
Q

69: (p.42) At which OSI layer do we nd segments?

A

4 or transport

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21
Q

70: (p.42) What is the Protocol Data Unit at OSI layer 4?

A

segment

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22
Q

71: (p.42) What is layer 3 of the OSI model?

A

network

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23
Q

72: (p.43) What layer number is the Network layer of the OSI model?

A

3

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24
Q

73: (p.43) At which OSI layer is the Internet?

A

3 or network

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25
Q

74: (p.43) At which OSI layer are Wide Area Networks?

A

3 or network

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26
Q

75: (p.43) What does WAN stand for?

A

wide area network

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27
Q

76: (p.43) At which OSI layer is IP Addressing?

A

3 or network

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28
Q

77: (p.43) At which OSI layer is Logical Addressing?

A

3 or network

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29
Q

78: (p.43) At which OSI layer does a router operate?

A

3 or network

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30
Q

79: (p.43) At which OSI layer does a gateway operate?

A

3 or network

31
Q

80: (p.44) At which OSI layer is Network Address Translation?

A

3 or network

32
Q

81: (p.44) At which OSI layer is Port Address Translation?

A

3 or network

33
Q

82: (p.44) At which OSI layer do we nd packets?

A

3 or network

34
Q

83: (p.44) What is the Protocol Data Unit at OSI layer 3?

A

packet

35
Q

84: (p.44) What is layer 2 of the OSI model?

A

datalink

36
Q

85: (p.44) What layer number is the Data Link layer of the OSI model?

A

2

37
Q

86: (p.45) What does MAC stand for?

A

media access control

38
Q

87: (p.45) How does a typical laptop computer discover its own MAC ad-
dress?

A

It already knows it. It is burned in on the network card.

39
Q

88: (p.45) At which OSI layer is the Local Area Network?

A

2 or datalink

40
Q

89: (p.45) At which OSI layer is MAC Addressing?

A

2 or datalink

41
Q

90: (p.45) At which OSI layer is Physical Addressing?

A

2 or datalink

42
Q

91: (p.45) At which OSI layer is Ethernet?

A

2 or datalink

43
Q

92: (p.45) At which OSI layer does a switch operate?

A

2 or datalink

44
Q

93: (p.45) At which OSI layer does a bridge operate?

A

2 or datalink

45
Q

94: (p.46) What is a multi-port bridge called?

A

switch

46
Q

95: (p.46) What is a two-port switch called?

A

bridge

47
Q

96: (p.46) At which OSI layer do we nd frames?

A

2 or datalink

48
Q

97: (p.46) What is the Protocol Data Unit at OSI layer 2?

A

frame

49
Q

98: (p.46) What is layer 1 of the OSI model?

A

physical

50
Q

99: (p.46) What layer number is the Physical layer of the OSI model?

A

1

51
Q

100: (p.47) At which OSI layer is wireless signal?

A

1 or physical

52
Q

101: (p.47) At which OSI layer is coaxial cable?

A

1 or physical

53
Q

102: (p.47) At which OSI layer is cat5 cable?

A

1 or physical

54
Q

103: (p.47) At which OSI layer is ber-optic cable?

A

1 or physical

55
Q

104: (p.47) What is a multi-port repeater called?

A

hub

56
Q

105: (p.47) What is a two-port hub called?

A

repeater

57
Q

106: (p.47) At which OSI layer does a hub operate?

A

1 or physical

58
Q

107: (p.47) At which OSI layer does a signal repeater operate?

A

1 or physical

59
Q

108: (p.48) At which OSI layer do we nd bits?

A

1 or physical

60
Q

109: (p.48) What is the Protocol Data Unit at OSI layer 1?

A

bits

61
Q

110: (p.52) What is a software port?

A

A port is a number that indicates which computer program should receive
the message.

62
Q

111: (p.56) What is a hop?

A

A hop is the moving of a packet from one LAN to another.
A hop is the activity performed by a router when it receives a packet on one
local area network, and passes it across to a dierent local area network,
one step closer to its nal destination.

63
Q

112: (p.57) What does TTL stand for?

A

time to live

64
Q

113: (p.57) What is the purpose of TTL?

A

It reduces the risk of network loops.

65
Q

114: (p.59) What does having a routable address mean?

A

Packets can be sent to you across the Internet just using your own IP
address.

66
Q

115: (p.60) What are the ve non-routable IP address blocks?

A

10.x.x.x, 127.x.x.x, 169.254.x.x, 172.16-31.x.x, and 192.168.x.x.

67
Q

116: (p.60) What does NAT stand for?

A

network address translation

68
Q

117: (p.60) What does PAT stand for?

A

port address translation
PAT is another name for Network Address Translation. NAT is the generally
used terminology.

69
Q

118: (p.61) Explain Man In The Middle?

A

Man in the middle is (a) a hacking technique. (b) Two computers believe
they are talking to each other. (c) Instead they are talking through (by
way of) a third computer.

70
Q

119: (p.63) In NAT, how does the router remember the original sender?

A

The router keeps a table that matches outside port numbers with inside
IP address and port number pairs.

71
Q

120: (p.63) What is garbage collection?

A

Reclaiming resources that are no longer in use.

72
Q

121: (p.64) How long do NAT address pool entries last?

A

Address pool entries often expire (a) after ten minutes, or (b) when the
table is full the most stale entry expires.

73
Q

122: (p.64) What is a keep-alive?

A

A keep-alive is a message that is sent between two computers just to keep
the connection from timing out and being dropped.

74
Q

123: (p.68) What does DMZ stand for?

A

demilitarized zone
Port forwarding can be set up with triggers, but it’s still tricky.
These methods are really a last resort. They work but they are dicult to
set up and use.

280 networking (6 decks)

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