chapter 2

Question 1

What is OSI

Answer 1

Open System Interconnection

Question 2

How many layers are in OSI

Answer 2

7 layers
- Application
- Presentation
- Session
- Transport
- Network
- Data Link
- Physical

Question 3

Functionality of Application

Answer 3

• closest to user
• allow network access in this layer

Question 4

Functionality of Presentation

Answer 4

• make data readable in lower layers
• encryption
• translation = sender - common - receiver
• compression = reduce bits

Question 5

Functionality of Session

Answer 5

• manages & terminates sessions
• sufficient data transfer during sessions
• checkpoints

Question 6

Functionality of Transport

Answer 6

• segmentation of data into packet size
• flow control = optimize transfer rate
• error control = ensure completion of data transfer

Question 7

Functionality of Network

Answer 7

• determining the shortest path
• header consists source & destination address

Question 8

Functionality of Data Link

Answer 8

• convert packets into frames
• flow & error control
• network typology

Question 9

Functionality of Physical

Answer 9

• wires, cables, routers, switches
• convert frames into bits