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E. without using any higher level protocol, not even the TCP protocol. Using this socket we write an ICMP packet (Internet Control Management Protocol) into the buffer we are going to send, and we wait for the answer. When the answer arrives we record how much time it took for the packet to make the round trip. It sounds simple but it isn’t. It took me quite a while to make an implementation that is at the same time easy to use and robust. For instance, what happens if the other side never answers?

E. a standardized exchange between two computers. Within a HTTP transaction, you exchange information with another computer elsewhere on a network. The information exchanged can be a file that contains data in the form of text, sound, video, or whatever, or it can be the results of a database query. A piece of information exchanged over a network is called a resource. Normally the computer that sends a resource is the server and the computer that receives that resource is a client. The process of obtaining a resource using the HTTP protocol requires that a series of messages be exchanged between the client and the server.

1 of the network software. Note that the library included with lcc-win32 doesn’t need this step, since it will perform it automatically if it detects that the network wasn’t initialized. 2 Creating a socket Once initilized, we can create a socket, trough which we are going to send and receive the data. We call for this the ‘socket’ function: SOCKET Socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ); The error report of the socket call is a return value of INVALID_SOCKET. A typical sequence would be: if ( Socket == INVALID_SOCKET ) { printf( "Error: %ld\n", WSAGetLastError() ); } Note that under the UNIX operating system, socket descriptors are equivalent to file handles.

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