Chapter 2

Question 1

OSI Model

Answer 1

Application –> Data
Presentation –> Data
Session –> Data
Transport –> Segments
Network –> Packets
Data Link –> Frames
Physical –> Bits

Question 2

Application layer

Answer 2

Network services to end user
Allow access to network resources
Protocol: HTTP

Question 3

Presentation layer

Answer 3

Converting data from one format to another
Translate, encrypt, compress data

Question 4

Session layer

Answer 4

Establish, manage, terminate sessions or connections

Question 5

Transport layer

Answer 5

How much data to send, how fast, where is goes?
Provide reliable process to process message deliver, error recovery
Protocol: TCP, UDP

Question 6

Network layer

Answer 6

Move packets from source to destination
Provide internetworking mapping between addresses

Question 7

Data link layer

Answer 7

Organize bits into frames and checks for transmission errors
Hop to hop delivery
Most complex
MAC, LLC

Question 8

Physical layer

Answer 8

Transmit bits over medium
Provide mechanical and electrical components
Literal cables

Question 9

TCP/IP Model

Answer 9

Application
Transport
Network
Data link
Physical

Question 10

Addresses (TCP/IP)

Answer 10

Physical –> Data link, physical layers (physical networks)
Logical –> Network layer (IP, other protocols)
Port –> Transport layer (TCP, UDP, SCTP)
Specific –> Application layer (processes)

Question 11

Multiplexing

Answer 11

Various data signals integrate into single output

Question 12

Demultiplexing

Answer 12

One input data signal is divided into various output signals