2.1-1 The client-server paradigm. Which of the characteristics below are associated with a client- server approach to structuring network applications (as opposed to a P2P approach)? Select one or more: a. There is a server with a well known server IP address. b. HTTP uses this application structure. c. There is a server that is always on. d. There is not a server that is always on. e. A process requests service from those it contacts and will provide service to processes that contact it. 2.3-2 Comparing and contrasting HTTP and SMTP. Which of the following characteristics apply to HTTP only (and do not apply to SMTP)? Note: check one or more of the characteristics below. Select one or more: a. Uses a blank line (CRLF) to indicate end of request header b. Operates mostly as a "client push" protocol. c. Uses server port 25. d. Operates mostly as a "client pull" protocol. e. Uses CRLF.CRLF to indicate end of message. f. Uses server port 80. g. Has ASCII command/response interaction, status codes. h. Is able to use a persistent TCP connection to transfer multiple objects