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IT280 Reviewer > OSI > Flashcards

OSI Flashcards

(75 cards)

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1
Q

What is layer 7 of the OSI model?

A

application

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2
Q

What layer number is the Application layer of the OSI model?

A

7

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3
Q

What is layer 6 of the OSI model?

A

presentation

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4
Q

What layer number is the Presentation layer of the OSI model?

A

6

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5
Q

At which OSI layer is encryption / decryption?

A

6 or presentation

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6
Q

At which OSI layer is data compression?

A

6 or presentation

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7
Q

What is layer 5 of the OSI model?

A

session

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8
Q

What layer number is the Session layer of the OSI model?

A

5

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9
Q

What is layer 4 of the OSI model?

A

transport

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10
Q

What layer number is the Transport layer of the OSI model?

A

4

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11
Q

What does MTU stand for?

A

maximum transmission unit

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12
Q

What is the typical value for MTU (in bytes)?

A

1500

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13
Q

At which OSI layer are software ports?

A

4|transport

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14
Q

What does TCP stand for?

A

transmission control protocol

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15
Q

Which protocol provides for guaranteed delivery of information?

A

tcp

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16
Q

At which OSI layer is TCP?

A

4|transport

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17
Q

Which protocol provides for fast (but not guaranteed) delivery of information?

A

udp

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18
Q

What does UDP stand for?

A

user datagram protocol

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19
Q

At which OSI layer is UDP?

A

4|transport

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20
Q

At which OSI layer do we find segments?

A

4|transport

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21
Q

What is the Protocol Data Unit at OSI layer 4?

A

segment

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22
Q

What is layer 3 of the OSI model?

A

network

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23
Q

What layer number is the Network layer of the OSI model?

A

3

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24
Q

At which OSI layer is the Internet?

A

3 or network

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25
At which OSI layer are Wide Area Networks?
3 or network
26
What does WAN stand for?
Wide Area Network
27
At which OSI layer is IP Addressing?
3 or network
28
What does IP stand for?
internet protocol
29
At which OSI layer is Logical Addressing?
3 or network
30
At which OSI layer does a router operate?
3 or network
31
At which OSI layer does a gateway operate?
3 or network
32
At which OSI layer is Network Address Translation?
3 or network
33
At which OSI layer is Port Address Translation?
3 or network
34
At which OSI layer do we find packets?
3 or network
35
What is the Protocol Data Unit at OSI layer 3?
packet
36
What is layer 2 of the OSI model?
datalink
37
What layer number is the Data Link layer of the OSI model?
2
38
What does MAC stand for?
media access control
39
How does a typical laptop computer discover its own MAC address?
It already knows it. It is burned in on the network card.
40
What does NIC stand for?
network interface controller
41
At which OSI layer is the Local Area Network?
2 or datalink
42
At which OSI layer is MAC Addressing?
2 or datalink
43
At which OSI layer is Physical Addressing?
2 or datalink
44
At which OSI layer is Ethernet?
2 or datalink
45
At which OSI layer does a switch operate?
2 or datalink
46
At which OSI layer does a bridge operate?
2 or datalink
47
What is a multi-port bridge called?
switch
48
What is a two-port switch called?
bridge
49
At which OSI layer do we find frames?
2 or datalink
50
What is the Protocol Data Unit at OSI layer 2?
frame
51
What is layer 1 of the OSI model?
physical
52
What layer number is the Physical layer of the OSI model?
1
53
At which OSI layer is wireless signal?
1 or physical
54
At which OSI layer is coaxial cable?
1 or physical
55
At which OSI layer is cat5 cable?
1 or physical
56
At which OSI layer is fiber-optic cable?
1 or physical
57
What is a multi-port repeater called?
hub
58
What is a two-port hub called?
repeater
59
At which OSI layer does a hub operate?
1 or physical
60
At which OSI layer does a signal repeater operate?
1 or physical
61
At which OSI layer do we find bits?
1 or physical
62
What is the Protocol Data Unit at OSI layer 1?
bits
63
What is a hop?
A hop is the moving of a packet from one LAN to another.
64
What does TTL stand for?
time to live
65
What is the purpose of TTL?
It reduces the risk of network loops.
66
What does having a routable address mean?
Packets can be sent to you across the Internet just using your own IP address.
67
List the five non-routable IP address blocks
10.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16, 172.16.0.0/12, 192.168.0.0/16
68
What does NAT stand for?
network address translation
69
What does PAT stand for?
port address translation
70
Explain Man In The Middle?
Man in the middle is (a) hacking technique. (b) Two computers believe they are talking to each other. Instead they are talking through (by way of) a third computer.
71
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.
72
What is garbage collection?
Reclaiming resources that are no longer in use.
73
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.
74
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.
75
What does DMZ stand for?
demilitarized zone

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