Lecture 1: Network Models

Question 1

What is a Network?

Answer 1

A network is a group of computers or devices connected together in such a way as to allow users controlled access to shared resources.

Question 2

What are the advantages to a Network?

Answer 2

1. Users can share data quickly and efficiently.
2. Access to shared Peripheral devices such as printers, scanners and fax machines.
3. Groups of users to exchange information and share data.
4. Easy and effiecient communication among individual (email)
5. Easier administration.
6. Reduced costs through resource sharing.

Question 3

What are the three levels in a Network Structure?

Answer 3

Core - Distribution - Access

Question 4

What are the 7 layers of the OSI model? (All People Seem To Need Data Processing)

Answer 4

Application - Presentation - Session - Transport - Network - Datalink - Physical

Question 5

What is the PDU for the Application, Presentation and Sessions layers of the OSI model.

Answer 5

Data

Question 6

What is the PDU for the Transport layer of the OSI model?

Answer 6

Segments

Question 7

What is the PDU for the Network layer of the OSI model?

Answer 7

Packets

Question 8

What is the PDU for the Data Link layer of the OSI model?

Answer 8

Frames

Question 9

What is the PDU for the Physical layer of the OSI model?

Answer 9

Bits