Chapter 21

Question 1

What is VPN

Answer 1

Virtual Private Network (VPN) combines the features of both private and public networks. It is limited to single organization and uses public network for connectivity. These connections are sometimes called tunnels and connect sites. Each site sees tunnel as point-to-point link. There is no access for other users of public networks.

Question 2

What is Service Paradigm

Answer 2

At the lowest level most networks transfer individual packets of data and the network requires each packet to follow an exact format dictated by the hardware, which is called Interface paradigms or service paradigms.

Question 3

What are two types of service paradigms

Answer 3

CONNECTION-ORIENTED: It is similar to the telephone system: endpoints establish and maintain a connection as long as they have data to exchange.
CONNECTIONLESS: Similar to postal system: endpoints put data to send into a packet and hand to network for delivery.

Question 4

Some connection-oriented technologies provide full duplex while other allow on simplex connection.
True/False

Answer 4

True

Question 5

What are 2 types of connections in SIMPLEX & FULL DUPLEX CONNECTION

Answer 5

1- Switched Connection

2- Permanent Connection

Question 6

What are STREAM OR MESSAGE INTERFACE

Answer 6

Some connection-oriented networks provide stream interfaces and some message interface. In stream interfaces, no boundaries are recorded that receiver may receive a single block of 60 characters. In message interface, data delivers in the same size chunks that the sender transmitted.

Question 7

Can a network use 2 different service paradigm at a same time

Answer 7

Yes

Question 8

Does Connectionless delivery requires address and Connection-oriented delivery use short hand that identifies the connection rather than the destination
True/False

Answer 8

True