OSI Model

Question 1

What is a protocol ?

Answer 1

Set of rules for formatting and processing data

Question 2

Internetworking models

Answer 2

Organize and describe network functions

Question 3

Open systems interconnection model (OSI)

Answer 3

Seven layers containing various types of hardware and software

Question 4

Data stream=?
Transport=?
Network=?
Data Link=?
Physical=?

Answer 4

Application, presentation, session
Segment, Datagram
Packet
Frame
Bit

Question 5

Layer 7 Application

Answer 5

Responsible for interfacing user application, network management services, remote access, etc.

Question 6

Layer 6 Presentation

Answer 6

Concerned about the format, application must use a common format

Question 7

What are the main services at layer 6 ?

Answer 7

Data conversion, character code translation, compression, encryption/decryption

Question 8

Layer 5 Session

Answer 8

Provides logical persistent connection between peer hosts

Question 9

What does the session layer do ?

Answer 9

Creates, monitors, and tears down sessions

Question 10

Which duplex mode does the session operate with ?

Answer 10

Full duplex, half duplex, and simplex

Question 11

Which layer is the busiest ?

Answer 11

Transport

Question 12

What does transport create ?

Answer 12

End-to-end transport between peer hosts

Question 13

What protocols operate at layer 4 ?

Answer 13

TCP and UDP

Question 14

Does TCP use flags ?

Answer 14

Yes

Question 15

What does the network layer use ?

Answer 15

Logical addresses (IP)

Question 16

Does IP guarantee delivery ?

Answer 16

No only finds the best route

Question 17

Devices that operate in layer 3 ?

Answer 17

Routers

Question 18

What do routing tables help with ?

Answer 18

Delivering the information

Question 19

What is the network layer responsible for ?

Answer 19

Routing data across the network

Question 20

What is one of the main functions of layer 2 ?

Answer 20

Assigning the MAC address to communicate

Question 21

Does the data link layer transmit frames or packets ?

Answer 21

Frames

Question 22

What does layer 2 convert data into for transportation ?

Answer 22

Bits

Question 23

Does layer 2 do error detection ?

Answer 23

Yes

Question 24

Where does layer 2 move the data to ?

Answer 24

The next physically connected device

Question 25

What are the two sublayers of layer 2 ?

Answer 25

LLC and MAC

Question 26

What are the devices that operate on layer 2 ?

Answer 26

Switches and bridges

Question 27

What does the MAC sublayer manage ?

Answer 27

Protocol access to the physical network medium

Question 28

What is the MAC sublayer responsible for ?

Answer 28

Addressing and channel access control mechanisms

Question 29

What controls does the LLC sublayer provide ?

Answer 29

Flow and error

Question 30

Where does the physical layer receive its bits from ?

Answer 30

Data Link Layer

Question 31

What are bits converted into ?

Answer 31

Electricity, lights, or radio waves

Question 32

Are physical topologies part of layer 1 ?

Answer 32

Yes

Question 33

What are layer 1 devices ?

Answer 33

Cables, connectors, hubs, modems, etc.

Question 34

At which layer of the OSI Model does the encapsulation process begin ?

Answer 34

Application

Question 35

What is the primary purpose of a networking protocol ?

Answer 35

To define rules and standards for data communication between network devices