OSI Layers

Question 1

Layer 1

Answer 1

Physical

Physical representation, cables, radio frequency, layout of pins, volts etc

Question 2

Layer 2

Answer 2

Data Link
(Handles data transfer and error correction. Two sub layers Media Access Control, adds MAC addresses, and Local Link Control, flow control)

Question 3

Layer 3

Answer 3

Network

Adds IP addresses (packets) What path packets take when forwarding through different routers

Question 4

Layer 4

Answer 4

Transport
(Coordination of data transport, how much data, what rate, where it goes etc. TCP and UDP are used at this level. Segments data and makes sure if arrives in order. Adds ports)

Question 5

Layer 5

Answer 5

Session

Setting up a session between computers, assigns session ID. Setup maintain teardown sessions

Question 6

Layer 6

Answer 6

Presentation

Presents, prepares/translates, data for layer 5 or 7 encrypts, compresses, formatting decryption, decompressing

Question 7

Layer 7

Answer 7

Application

Integrates network functionality into host operating systems. HTTP, Telnet, FTP, TFTP, SNMP

Question 8

Please
Do
Not
Tell
Sales
People
Anything

Answer 8

Physical
Data-Link
Network
Transport
Session
Presentation
Application