OSI

Question 1

what is the

OSI means

Answer 1

Open Systems Interconnection

Question 2

what are the

layers of the OSI model

Answer 2

7. Application
8. Presentation
9. Session
10. Transport
11. Network
12. Data link
13. Physical

Question 3

what is

OSI layer 1

Answer 3

physical layer

Question 4

what is the

data link layer payload

Answer 4

network layer packet

Question 5

what makes up the

OSI layer 2 frame

Answer 5

Destination address + Source address + Payload + Error Check

(Network layer packet)

Question 6

describe

OSI layer 2 error checking

Answer 6

only capable of very basic error checking, such as error checking or corrupt frames

no way to acknowledge or retransmit damaged frames

Question 7

what is the

the MAC sublayer covers

Answer 7

1. logical topology- bus or ring
2. media access method- contention or token based
3. addressing- format for hardware addresses
4. frame format
5. error checking mechanism

Question 8

what is the

OSI layer 3

Answer 8

network layer

Question 9

what is the

purpose of OSI network layer

Answer 9

moving data around a network of networks

(internetwork or the Internet)

Question 10

what is the

routing occurs at OSI ______ layer

Answer 10

layer 3

network layer

Question 11

what is the

OSI layer 4

Answer 11

transport layer

Question 12

what is the

what is OSI transport layer also known as

Answer 12

end-to-end

or

host-to-host

layer

Question 13

what is the

function of the OSI transport layer

Answer 13

identify each type of network application by assigning it a port number

Question 14

what is the

network layer pdu

Answer 14

packets

or

datagrams

Question 15

what is the

OSI layer 4 PDU

Answer 15

segment

Question 16

what is the

OSI reliable data delivery layer

Answer 16

OSI layer 4, transport layer

Question 17

what is the

OSI layer 5

Answer 17

session layer

Question 18

what is the

function of OSI session layer

Answer 18

dialog control functions

Question 19

what are the

dialog control functions

Answer 19

• establishing dialog
• managing data transfer
• ending (tearing down) the session

Question 20

what are the different

session modes

Answer 20

• one-way / simplex
• two-way alternate (TWA) / half-duplex

taking turns [cb radio]

• two-way simultaneous (TWS) / duplex

[phone call]

Question 21

what is the

OSI layer 6

Answer 21

presentation layer

Question 22

what is the function of the

OSI presentation layer

Answer 22

transforms data between the format required for the network & the format required for the application

Question 23

which is the

OSI layer supporting data compression & encryption

Answer 23

layer 6

presentation layer

Question 24

what is the

OSI layer 7

Answer 24

application layer

Question 25

# what is the function of the OSI application layer

Answer 25

provides an interface for programs on hosts with communication channel to exhcange data

Question 26

# What model is this 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data link 1. Physical

Answer 26

layers of the OSI model

Question 27

# Which layer is the physical layer

Answer 27

OSI layer 1

Question 28

# What is Destination address + Source address + Payload + Error Check ## Footnote (Network layer packet)

Answer 28

OSI layer 2 frame

Question 29

# What is only capable of very basic error checking, such as error checking or corrupt frames no way to acknowledge or retransmit damaged frames

Answer 29

OSI layer 2 error checking

Question 30

# What covers 1. logical topology- bus or ring 2. media access method- contention or token based 3. addressing- format for hardware addresses 4. frame format 5. error checking mechanism

Answer 30

MAC sublayer

Question 31

# Which OSI layer is the network layer

Answer 31

OSI layer 3

Question 32

# What is responsible for moving data around a network of networks (internetwork or the Internet)

Answer 32

OSI network layer

Question 33

# What transport layer

Answer 33

OSI layer 4

Question 34

# Which OSI layer is the end-to-end or host-to-host layer

Answer 34

OSI transport layer layer 4

Question 35

# What is responsible to identify each type of network application by assigning it a port number

Answer 35

the OSI transport layer layer 4

Question 36

# What are packets or datagrams

Answer 36

network layer pdu

Question 37

# Which OSI layer uses a segment

Answer 37

OSI layer 4 PDU

Question 38

# What session layer

Answer 38

OSI layer 5

Question 39

# What layer provides dialog control functions

Answer 39

function of OSI session layer layer 5

Question 40

# What provides * establishing dialog * managing data transfer * ending (tearing down) the session

Answer 40

dialog control functions

Question 41

# What are these * one-way / simplex * two-way alternate (TWA) / half-duplex taking turns [cb radio] * two-way simultaneous (TWS) / duplex [phone call]

Answer 41

session modes

Question 42

# What presentation layer

Answer 42

OSI layer 6

Question 43

# What OSI layer transforms data between the format required for the network & the format required for the application

Answer 43

OSI presentation layer layer 6

Question 44

# What application layer

Answer 44

OSI layer 7

Question 45

# What OSI layer provides an interface for programs on hosts with communication channel to exhcange data

Answer 45

OSI application layer layer 7

Question 46

# what is a logical segment

Answer 46