1         Which of the following statements is (are) correct?

a)       The telephone network carries only voice messages

b)       A fax machine will still work when the telephone network is disrupted

c)       Mobile telephones are an extension of the fixed line telephone network

d)       The Internet is more flexible than the public telephone network

2        Which services are most affected by overload when a disaster occurs?

a)       The public mobile telephone network

b)       The Internet

c)       All non-public networks

d)       All public networks

3        Which of the following statements is (are) correct?

a)       The users control public networks

b)       The authorities of two or more countries control international networks

c)       Operating a public network requires government authorization

d)       None of the above

4        Which of the following networks are public networks:

a)       Mobile telephone networks

b)       The networks of police, fire fighters and ambulances

c)       The telex network

d)       All of the above