a. What is the syntax of a socket?

19a1.) The source socket is 60.171.18.22:2707. The source is a(n) ______.

a. Client

b. Server

c. Well-known server

d. Ephemeral server

19a2.) The destination socket is 60.171.18.22:161. The destination host is a(n) ______.

a. Client

b. Server

c. Well-known server

d. Ephemeral server

19a3.) Which of the following is a socket?

a. 80

b. 21

c. Both A and B

d. Neither A nor B

b. In Figure 2-16, when the client transmits to the mail server, what is the source socket?

c. What is the destination socket?

d. When the S M T P server transmits to the client host, what is the source socket?

e. What is the destination socket?