2.2-11 What's in an HTTP reply? Which of the following pieces of information will appear in a server's application-level HTTP reply message? (Check all that apply.) Select one or more: a. A checksum b. The server's IP address c. The name of the Web server (e.g., gaia.cs.umass.edu) d. A response code e. A response phrase associated with a response code f. A sequence number 2.2-2 HTTP cookies. What is an HTTP cookie used for? Select one: a. Like dessert, cookies are used at the end of a transaction, to indicate the end of the transaction. b. A cookies is a code used by a server, carried on a client's HTTP request, to access information the server had earlier stored about an earlier interaction with this person. [Think about the distinction between a browser and a person.) c. A cookie is used to spoof client identity to an HTTP server. d. A cookie is a code used by a client to authenticate a person's identity to an HTTP server. e. A cookie is a code used by a server, carried on a client's HTTP request, to access information the server had earlier stored about an earlier interaction with this Web browser. (Think about the distinction between a browser and a person.] 2.1-2 The peer-to-peer (P2P) paradigm. Which of the characteristics below are associated with a P2P approach to structuring network applications (as opposed to a client-server approach)? Select one or more: a. There is a server that is always on. b. A process requests service from those it contacts and will provide service to processes that contact it. c. There is a server with a well known server IP address. d. There is not a server that is always on. e. HTTP uses this application structure