lecture 2

Question 1

What is the process?

Answer 1

program running within a host
within same host, two processes communicate using
inter-process communication (defined by OS)
processes in different hosts communicate by exchanging messages

Question 2

What is client process?

Answer 2

Process that initiates communication.

Question 3

What is server process?

Answer 3

process that waits to be contacted.

Question 4

What does sockets do?

Answer 4

Process sends/receives messages to/from its socket.

Question 5

What is identifier?

Answer 5

To receive messages,p process have 32 but identifier.

Question 6

What does identifier contain?

Answer 6

It includes IP address and port numbers.

Question 7

What does app layer protocol defines?

Answer 7

Messages exchanged
Message syntax.
message semantics.
rules.
open protocols.

Question 8

What transport service does an app need?

Answer 8

Data integrity, throughput, timing and security.

Question 9

TCP service?

Answer 9

1. Reliable transport.
2. Congestion control.
3. Flow control.

Question 10

UDP service?

Answer 10

1. Unreliable data transfer between sending and receiving.
2. NO congestion control.
3. No flow control.

Question 11

Difference between video and digital image.

Answer 11

1. Video: Sequence of images displayed at constant rate.

2. Digital image: array of pixels. Each pixel represented by bits.

Question 12

Difference between CBR and VBR?

Answer 12

CBR-> video encoding rate is fixed.

VBR-> Video encoding rate changes as amount spatial temporal coding changes.

Question 13

Multimedia networking type?

Answer 13

1. Streaming stored video/audio.
2. Conversational voice/video over IP.
3. Streaming live audio . , video.