Exam 2 Updated.

Front 1

At which OSI layer is software ports?

Back 1

4, TransPORT.

Front 2

What is layer 5 of the OSI model?

Back 2

The Session layer

Front 3

What does TCP stand for?

Back 3

Transmission Control Protocol

Front 4

At which OSI layer is TCP?

Back 4

Layer 4 TCP Door

Front 5

What is the Protocol Data Unit at OSI layer 4?

Back 5

Segment

Front 6

At which OSI layer does a gateway operate?

Back 6

3

Front 7

What layer is the Internet?

Back 7

Layer 3, network

Front 8

At which OSI layer are Wide Area Networks? (answer with a single
number or word).

Back 8

3, W1DE A2RA N3TWORKS

Front 9

At which OSI layer is IP Addressing?

Back 9

3, The Network layer.

Front 10

At which OSI layer is Logical Addressing? (answer with a single number
or word)

Back 10

3

Front 11

At which OSI layer does a router operate? (answer with a single number
or word)

Back 11

3

Front 12

Layer 1 or the Physical Layer

Back 12

3

Front 13

At which OSI layer is Port Address Translation? (answer with a single
number or word)

Back 13

3

Front 14

At which OSI layer do we find packets? (answer with a single number or
word)

Back 14

3

Front 15

What is the Protocol Data Unit at OSI layer 3? (answer with a single word)

Back 15

packet

Front 16

At which OSI layer is the Local Area Network? (answer with a single
number or word)

Back 16

2

Front 17

At which OSI layer does a switch operate? (answer with a single number
or word)

Back 17

2

Front 18

At which OSI layer does a bridge operate? (answer with a single number
or word)

Back 18

Layer 2 or the Data link layer.

Front 19

What is a multi-port bridge called? (answer with a single word)

Back 19

switch

Front 20

What is a two-port switch called? (answer with a single word)

Back 20

bridge

Front 21

At which OSI layer do we find frames? (answer with a single number or
word)

Back 21

Data Link Layer

Front 22

What is a multi-port repeater called? (answer with a single word)

Back 22

A hub

Front 23

What is a two-port hub called? (answer with a single word)

Back 23

A repeater

Front 24

At which OSI layer does a signal repeater operate? (answer with a
single number or word)

Back 24

1

Front 25

What is the Protocol Data Unit at OSI layer 1? (answer with a single word)

Back 25

bits

Front 26

At which OSI layer do we find bits? (answer with a single number or word)

Back 26

1

Front 27

What is a hop?

Back 27

A hop is the passage of data between different LANs

Front 28

What does TTL stand for?

Back 28

Time to Live

Front 29

What is the purpose of TTL?

Back 29

avoid infinite loops

Front 30

What does routable mean?

Back 30

deliverable through the network with its own IP address

Front 31

What are the five non-routable IP address blocks?

Back 31

10.x.x.x, 127.x.x.x, 169.254.x.x, 172. 16-31.x.x, 192.168.x.x

Front 32

What does NAT stand for?

Back 32

Network Address Translation

Front 33

What does PAT stand for?

Back 33

Port Address Translation

Front 34

Explain Man In The Middle?

Back 34

Hacking technique in which the computers think they are sending information to eachother but the message is actually going through a third computer

Front 35

In NAT, how does the router remember the original sender?

Back 35

by keeping a table of IPaddress:port number pairs linked to the outbound connection port

Front 36

What is garbage collection?

Back 36

claiming of something that is no longer used

Front 37

How long do NAT address pool entries last?

Back 37

often expires every 10 minutes, when the entry is full, when the most stale entry expires

Front 38

What is a keep-alive?

Back 38

a message between two computers to keep the connection going on.