OSI Model

Question 1

Physical Layer

Answer 1

• layer at which bits are actually sent out across through wire or wireless media
• we can “touch” the physical layer

Question 2

Data Link Layer

Answer 2

• translates data into binary and also converts back
• error detection
• establishment of protocols used for data transmission
• performs addressing at a physical layer

Question 3

Network Layer

Answer 3

• identifies other computers on the network through an addressing scheme (known as “routing”) specific to the network protocol in use

Question 4

Transport Layer

Answer 4

• breaks up messages into “packets” of similar size and numbering them so that they can be properly reassembled when received

Question 5

Session Layer

Answer 5

• sets up a “session” (or the “handshaking”) between two computers
• session control and making certain that the session is terminated when finished

Question 6

Presentation Layer

Answer 6

• data is compressed and encrypted in preparation for transmission

Question 7

Application Layer

Answer 7

• is the software that you run in your workstation

Question 8

OSI

Answer 8

Open Systems Interconnection

Question 9

ISO

Answer 9

International Organization for Standardization