Chapters 5 - 9 Flashcards by Reif Tauati

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

application

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

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

presentation

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

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

6 or presentation

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

6 or presentation

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

session

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

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

transport

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

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

maximum transmission (or transfer) unit

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

1500

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

4 or transport

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

transmission control protocol

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

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

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

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

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

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

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

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

4 or transport

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

4 or transport

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

segment

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

network

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

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

3 or network

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

3 or network

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

wide area network

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

3 or network

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

3 or network

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

3 or network

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

3 or network

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

3 or network

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

3 or network

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

3 or network

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

packet

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

datalink

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

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

media access control

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

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

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

2 or datalink

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

2 or datalink

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

2 or datalink

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

2 or datalink

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

2 or datalink

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

2 or datalink

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

switch

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

bridge

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

2 or datalink

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

frame

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

physical

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

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

1 or physical

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

1 or physical

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

1 or physical

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

1 or physical

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

hub

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

repeater

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

1 or physical

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

1 or physical

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

1 or physical

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

bits

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

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

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

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.

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

time to live

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

It reduces the risk of network loops.

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

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

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

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

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

network address translation

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

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

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

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.

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

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

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

Reclaiming resources that are no longer in use.

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

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

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

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

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

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.

Chapters 5 - 9 Flashcards

(74 cards)