The CCENT (Cisco Certified Entry Networking Technician) is the entry level certification offered by Cisco. It is the starting point and the first course (ICND1) and certification (CCENT) that you would do if you wished to pursue a career in Cisco networking.
Cisco defines the certification as
"Cisco Certified Entry Networking Technician (CCENT) validates the ability to install, operate and troubleshoot a small enterprise branch network, including basic network security. With a CCENT, network professional demonstrates the skills required for entry-level network support positions - the starting point for many successful careers in networking. The curriculum covers networking fundamentals, WAN technologies, basic security and wireless concepts, routing and switching fundamentals, and configuring simple networks. CCENT is the first step toward achieving CCNA, which covers medium size enterprise branch networks with more complex connections"
There are currently no pre-requisites to attend the course or to do the exam (640-822 ICND1). Passing the exam 640-822 will certify you as a CCENT.