Chapter 2 BB

Question 1

What goal was the ISO trying to achieve when they created the OSI model? Pg 28

Answer 1

Creating a protocol that would allow compatibility between network devices and software made by different vendors.

Question 2

Explain binding in the context of the OSI model. Pg 29

Answer 2

The communication processes that are related to each other are bound, or grouped together, at a particular later.

Question 3

What are the important benefits of the OSI model? Pg 29-30

Answer 3

• network communication process are separated thus enabling easier development, design, and troubleshooting.
• Allows multiple vendors to work on protocols thru standardization of network components.
• encourages industry standardization by specifically defining the tasks of each layer
• allows various types of network hardware and software to communicate
• prevents changes in one layer from affecting another

Question 4

What are the seven layers of the OSI model (from 1st to 7th)? What are their functions? Pg 30

Answer 4

1 - Physical - Physical topology
2 - Datalink - framing

3 - Network - routing
4 - Transport - end-to-end connection

5 - Session - dialog control
6 - Presentation - data encryption, compression, and translation services
7 - Application - file, print, message, database, and application services

Question 5

What do the top 3 layers of the OSI model do? Pg 31

Answer 5

Define the rules of how the applications working within host machines communicate with each other as well as with end users.

Question 6

What do the bottom 4 layers of the OSI model do? Pg 31

Answer 6

Define how the actual data is transmitted from end to end.

Question 7

The application layer chooses and determines the availability of __________ ______ along with the _____ necessary to make their required connections. Pg 32

Answer 7

communicating partners, resources

Question 8

T/F Web browsers reside within the application layer. Pg 32

Answer 8

False. Web browsers interface with the application layer, they do not reside in it.

Question 9

Summarize the function of the presentation layer. Pg 33

Answer 9

Presents data to the application layer, translates incoming data, and formats code.

Question 10

Summarize the function of the session layer. Pg 33

Answer 10

Keeps applications’ information separated from other applications’ data.

Question 11

Summarize the transport layer. Pg 33

Answer 11

Segments and reassembles data into a data stream.

Question 12

What is connection oriented communication? Pg 34

Answer 12

A sender and receiver establish a connection prior to sending data. (Similar to “shaking hands” before conversing with someone)