Before I tell you about the CCENT, know that 640-822 ICND 1, is the exam number. ICND 1 stands for Interconnecting Cisco Networking Devices Part 1. You can also choose to take the 640-816 ICND 2 exam later to get your CCNA Certification.
According to Cisco:
"The Cisco CCENT (Cisco Certified Entry Networking Technician) certification validates the skills required for entry-level network support positions, the starting point for many successful careers in networking. Candidates should have the knowledge and skill to install, operate and troubleshoot a small enterprise branch network, including basic network security. CCENT certification is the first step toward achieving CCNA, which covers medium size enterprise branch networks with more complex connections."

For the CCENT Exam, you have a time limit of 90 minutes and you'll receive 50-60 questions. Types of questions on the exam include:
-multiple-choice single answer
-multiple-choice multiple answers
-drag and drop
-fill in the blank and simulations
You're allowed to take an exam tutorial at the beginning of the exam. The tutorial isn't timed, but you have 15 minutes to go through it. You should see the tutorial just to familiarize yourself with the test format and learn how to answer the questions. This will also help you get in the mood of taking the test. You can also view a tutorial on Cisco's website at Cisco Certification Exam Tutorial.
Topics included in the CCENT exam include:
Topics on networking fundamentals; connecting to a WAN; basic security and wireless concepts; routing and switching fundamentals; the TCP/IP and OSI models; IP addressing; WAN technologies; operating and configuring IOS devices; configuring RIPv2, static and default routing; implementing NAT and DHCP; and configuring simple networks.
Exam topics may be updated at any time, so be sure to check the current topics at the below link:
http://www.cisco.com/web/learning/le3/current_exams/640-822.html
The details of all the topics are covered on this page. You can also find links to exam policies, tutorials, and FAQs. Bookmark this link, so you know the topics you'll need to study.