Ccna official exam certification library third edition is the newest edition of the all time best selling ccna self study preparation package this comprehensive review and practice package is designed for the latest ccna 640 802 exams the two books contained in this package ccent ccna icnd1 official exam certification guide second edition and ccna icnd2 official exam certification guide . Cisco press has the only self study guides approved by cisco for the new ccent and ccna routing and switching certifications the new edition of the best selling two book value priced ccna official cert guide library includes updated content new online practice exercises more than 600 practice exam questions and more than 2 hours of video training plus the ccent and ccna network simulator . The exciting new ccent ccna icnd1 640 822 official cert guide premium edition ebook and practice test is a digital only certification preparation product combining an ebook with enhanced pearson it certification practice testthe premium edition ebook and practice test contains the following items the ccent ccna icnd1 premium edition practice test including four complete icnd1 practice . Networking technologies can really be better understood when you master the tcp and osi models and if you understand the technologies better you can implement them more effectively and perhaps most importantly you can troubleshoot them more effectively. Vlan concepts and applications when you plug a bunch of pcs in to a switch and give them all ip addresses in the same network you create a lan