MDK-Middleware provides a Network Reference Example that contains following projects demonstrating how to use various services in the Network component:

HTTP Server shows the basic functionality of an embedded web server. It also contains information on the usage of the Common Gateway Interface (CGI) interface for web page interaction with the underlying hardware.
HTTPS Server shows the basic functionality of a secure web server using the mbed TLS software component.
HTTP Upload demonstrates how to access the SD card on a development board via a web interface.
FTP Server implements an FTP server for file manipulation.
Telnet Server gives an example how to use Telnet to implement a User Callbacks for communication with your device.
SMTP Client shows sending dynamic e-mail messages to a predefined email address.
SMTPS Client shows sending dynamic e-mail messages to a predefined email address from a secure client.
SNMP Agent shows how to use the Simple Network Management Protocol to control an embedded system.
BSD Client shows how to use BSD sockets for network communication from a client side.
BSD Server shows how to use BSD sockets for network communication from a server side.

See CMSIS-Toolbox - Reference Applications to learn more about the reference application concept.