Using the OSI Model to Describe Network Operations

Question 1

What does the OSI Model stand for?

Answer 1

Open Systems Interconnect

Question 2

When was the OSI model developed and why?

Answer 2

In the late 1970’s; to describe how networks operated.

Question 3

What is the main type of copper cabling that we use?

Answer 3

Twisted Pair Cabling

Question 4

Do the cables have any electronics in them. If so, name one.

Answer 4

No.

Question 5

Do we use coaxial cable or twisted pair cabling to connect a cable modem to the internet?

Answer 5

Coaxial cable

Question 6

Out on the internet, what is the preferred method of cabling and what is it essentially?

Answer 6

Fiber optics, which are very thin strands of glass.

Question 7

How many layers are there in the OSI model.

Answer 7

Seven

Question 8

Put the layers in order going from bottom to top:

Transport
Session
Data Link
Application
Network
Physical
Presentation

Answer 8

Application
Presentation
Session
Transport
Network
Data Link
Physical

Question 9

Which layer do the hardware used for data networking come under?

Answer 9

Physical

Question 10

What is the data link layer used for?

Answer 10

Allows devices to transfer bits of information over the cables.

Question 11

What is the protocol that is mainly used at the data link layer?

Answer 11

Ethernet

Question 12

What protocol would be used between your cable modem and the internet?

Answer 12

DOCSIS-3

Question 13

The data link layer is layer number … ?

Answer 13

Two

Question 14

What protocol would be used to send data to a device that is not on your local network?

Answer 14

Internet Protocol (IP)

Question 15

IP lies on which layer?

Answer 15

Network Layer

Question 16

What two methods of communication could be used on the network layer?

Answer 16

IP Addressing and IP Routing

Question 17

What is the name given to the protocol that sets up a session between a client and a workstation?

Answer 17

Transmission Control Protocol (TCP).

Question 18

What layer does TCP come under?

Answer 18

Transport Layer

Question 19

What are websites written in and what does the acronym stand for?

Answer 19

HTML (Hypertext Markup Language)

Question 20

When browsing websites, what protocol is used to transfer the website to your screen?

Answer 20

HTTP (Hypertext Transfer Protocol)

Question 21

What is the encrypted version of HTTP?

Answer 21

HTTPS (Hypertext Transfer Protocol Secure)

Question 22

Are HTTP and HTTPS the only protocols found at the application layer?

Answer 22

No, there are plenty more.

Question 23

Do the processes of the application layer run in conjunction with all the other layers, or do they run outside of them?

Answer 23

They run in conjunction but only with the transport layer.

Question 24

What layer number is the application number?

Answer 24

Seven

Question 25

Why do we not use the presentation layer of the OSI model as much anymore?

Answer 25

We used it as a means to translate from ASCII to EBCDIC, but the technology became quite antiquated and is rarely used.

Question 26

When we type on our keyboard, what translates the values so that the PC or laptop can understand it?

Answer 26

ASCII (American Standard Code for Information Interchange)

Question 27

With IBM devices, what did they use as a substitute for ASCII?

Answer 27

EBCDIC (Extended Binary Coded Decimal Interchange Code)

Question 28

With protocols that operate at the session layer, where do we classify them to work in for networking purposes?

Answer 28

Application Layer