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.
