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

Formatting, encoding, and translating data so different systems can understand each other

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

Responsibilities of the session layer?

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 the transport layer provide?

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 type of addressing 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 are the main functions of layer 2?

Answer 20

Framing, assigning MAC, error detection, flow control, access control

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

Controls how devices take turns using the network to send data

Question 28

What controls does the LLC sublayer provide ?

Answer 28

Flow and error

Question 29

Where does the physical layer receive its bits from ?

Answer 29

Data Link Layer

Question 30

What are bits converted into ?

Answer 30

Electricity, lights, or radio waves

Question 31

Are physical topologies part of layer 1 ?

Answer 31

Yes

Question 32

What are layer 1 devices ?

Answer 32

Cables, connectors, hubs, modems, etc.

Question 33

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

Answer 33

Application

Question 34

What is the primary purpose of a networking protocol ?

Answer 34

To define rules and standards for data communication between network devices