OSI Model

Question 1

OSI Model

Answer 1

1 - Physical
2 - Data link
3 - Network
4 - Transport
5 - Session
6 - Presentation
7 - Application

Pigs Don’t Nip Tails Say Pig Apologists

Question 2

1 - Physical

Answer 2

Physical topology

Sends / receives bits

Question 3

2 - Data Link

Answer 3

Combines packets into bytes + bytes into frames

MAC addresses

MAC + LLC

Question 4

3 - Network

Answer 4

Routing

IP (logical) addresses

Question 5

4 - Transport

Answer 5

End-to-end connection

TCP / UDP

Mutliplexing, virtual connections, tearing down virtual circuits

Question 6

5 - Session

Answer 6

Dialog control (duplex)

Session management between Presentation layer entities

Keeps different applications’ data separate

Question 7

6 - Presentation

Answer 7

Presents data to application layer

Data translation + code formatting

Data encryption + compression

Question 8

7 - Application

Answer 8

Provides user interface

Availability of computing partners

File, print, message, database + application services