Preparing for Cisco ICND1 exam.

• CCENT can't be passed just by memorization – candidates have to know and understand how Ethernet works.
• Check out forums for advice about which books to use.  Many recommend the official Cisco Press book by Wendell Odom, which covers the whole ICND1 syllabus and no more.  Try Abebooks for discounted and used books. 
• Candidates need to memorize many facts and figures (e.g. numbers of well-known ports, permissible lengths of cable runs, etc).  Get to know these kind of things so well that you can recall them without thinking.
• Cisco wants students to be really confident and quick at subnetting.  In the exam you will probably be nervous and concerned about time so you need to be confident of getting subnetting calculations correct first time. Make sure you can identify the subnet address, broadcast address, and range of usable addresses for any given address and mask combination.
• Develop a good understanding of collision and broadcast domains.  Learn how to identify them from diagrams. 
• Study the OSI model and the TCP/IP model.  There may be direct questions about both these models, but if there isn't they still help you get a really good understanding of how networks work.
• Use Cisco Packet Tracer or other network simulation software as early in your studies as possible.  
• WAN questions are usually quite straightforward and take up more of the exam than most candidates expect.
• In the exam, read the questions very carefully. If there are two choices in the answer that seem correct, read the question again, then choose the answer you think Cisco are looking for even if it isn't the answer you think is best.
• Prepare for a question or two that freaks you out - maybe because you think you should know the answer but don't, or maybe because you just haven't studied for it.  Everyone gets at least one of these, so keep calm, make your best guess, then move on.

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