Our CCNA Study Guide has so far provided you with quizzes on basic networking concepts, LAN fundamentals, IP routing, WAN concepts and routing protocols. If you've aced them, you might be ready for our comprehensive final exam, which covers more CCNA topics across the board.
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For more information, check out these additional resources:
Networking skills in short supply - Why should you take the CCNA exam? This news article explains the necessity of networking skills.
Cisco certifications - Check out our topics page for advice on other Cisco certifications.
Assigning an IP address ending in .0 or .255 - Read about the network theory behind IP addressing.