a. What service or services does Skype provide?

23a.) Skype provides _______.

a. Voice over IP

b. Video over IP

c. Both A and B

d. Neither A nor B

b. List and define Skype’s three main elements.

23b.) In which VoIP phase does Skype use a server instead of service directly between peers?

a. Signaling

b. Transport

c. Login

d. None of the above

c. Why is Skype login necessary? (This is a common problem in P2P processing.)

23c.) Skype login is necessary so that the user _______.

a. Can find the IP address of a Skype proxy server

b. Can find the IP address of a client it wishes to communicate with

c. To find its own Skype address

d. None of the above

d. What is a directory search in Skype?

23d.) In Skype, directory search to find the IP address of a client to be called is done by _______.

a. Peers

b. Super nodes

c. Skype servers

d. Direct communication between the calling and receiving clients

e. Which element of the Skype network is in charge of signaling?

23e.) In Skype, signaling is done by _______.

a. Peers

b. Super nodes

c. Direct communication between the calling and receiving clients

d. None of the above

f. Which element of the Skype network is in charge of transport?

23f.) In Skype, transport is governed by _______.

a. Peers providing signaling

b. Super nodes

c. Skype servers

d. Direct communication between the calling and receiving peers

g. Which of Skype’s three steps is done P2P?

23g.) In which VoIP phase does Skype implement with peer-to-peer service?

a. Signaling

b. Login

c. Both A and B

d. Neither A nor B

h. Compare Skype and traditional voice over IP in terms of whether login, signaling, and transport are P2P or whether they use servers.

23h.) Which phase of VoIP is different in traditional VoIP and Skype?

a. Signaling

b. Transport

c. Login

d. None of the above