Consider a tcp connection between host b and server
c. suppose that the tcp segments traveling from host b to server c have source port number 2345 and destination port number 443. a- what are the source and destination port numbers for the segments traveling from host c to host b? b- what can you deduce about server c? what kind of server is it?

TCP stands for Transmission Control Protocol for Communication of the Internet.  It is used to  interconnect network devices on the Internet and it is a connection oriented protocol which means that the connection between the devices (in our case host b and sever C) is established and maintained until they finish to exchange messages. Source port number specifies the application or services on host b and destination port number on host c. 
a. The source and destination port numbers for the segments traveling from host c to host b are : source: 443 , destination: 2345.
b. From the destination port number (443) we can deduce that the server c that it is a web server. Port 443 is the standard port number for website which use SSL(Secure Sockets Layer) .SSL is the standard security technology for establishing an encrypted link between a web server and a browser.