1. Which of the following networks use store-and-forward switching operation?

 a.  Telephone networks 

b. Wireless Networks 

c. Telegraph networks 

d. Computer networks

2. There are similarities between message switching and packet switching. Which of following that applies to packet switching but not to message switching?

a. variable length of information block

b. supporting multiple applications

c. store and forward

d. All of the above

3. Which of the following networks can be connection-oriented?

a. telegraph netwoorks

b. computer networks

c. telephone networks

d. all of above 

4. A protocolis a set of precise and unambiguous rules that governs

a. how two or more communicating entities in a layer are to interact

b. messages that can be sent and received

c. actions that are to be taken when a certain events occurs

d. all of the above 

5. DNS is a domain-name-service that responds to queries of domain name to IP address or IP address to domain name. DNS uses services provided by

a. TCP 

b. UDP 

c. HTTP 

d. none of the above

6. A network used to join the individual networks at different sites into one extended network is called

a. PAN 

b. LAN 

c. SAN

d. VPN

7. Upon receipt of a bad segment, UDP?

a. retransmission

b. it does flow control 

c. it does error control 

d. it does not do flow and error control