Aserver s is designed for computers to test if they are located behind nats or not. the server has two public ip addresses, i1 and i2, and has allocated two ports, p1 and p2 (either udp or tcp port), for this purpose. note that the ip address and the port numbers are known to every computer which wants to use this service. (a) design your protocol so that a computer a, by exchanging packets with s, can test if it is located behind an nat or not. (b) assume it is behind an nat. repeat (a) if computer a needs to determine if the nat is a symmetric type or not.

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.