Lecture 1

Question 1

What does the internet protocal stack contains

Answer 1

The IPS contains five layers: Physical, Link Network, Transport and Applcation

Question 2

Physical Layer

Answer 2

Physical Layer is the bits on the wire layer

Question 3

Link layer

Answer 3

Link layer is the data transfer between neoghboring network elements (Ethernet, wifi )

Question 4

Network layer

Answer 4

Is the routing of datagrams from source to destination (IP , routing protocols)

Question 5

Transport layer

Answer 5

process-process data transfer (TCP, UDP)

Question 6

Application layer

Answer 6

Supporting network application (FTP, SMTP, HTTP)

Question 7

Some network apps examples include

Answer 7

e-mail , voice over IP , real time video conferencing

Question 8

Client server architecute

Answer 8

Server: always on host, permanent IP address, server farms sor scaling

Question 9

Client server architecture

Answer 9

Client:
Communicate with server
may be intermittently connected
may have dynamic IP address

Question 10

P2P connection (Peer to peer connection)

Answer 10

No always on server
end systems directly communicate
peers intermittently connected and change IP address

Question 11

Skype is hybrid of P2P and client server

Answer 11

true

Question 12

HTTP is stateless

Answer 12

It doesnot maintain information about past client requests

Question 13

HTTP connections

Answer 13

Non persistenet HTTP : At most one connection is sent over a TCP

Persistent HTTP: Multiple objects can be sent over singlt TCP