CCNA Routing and Switching Study Guide: Exams 100-101, 200-101, and 200-120

CCNA Routing and Switching Study Guide: Exams 100-101, 200-101, and 200-120

English | 2013 | ISBN: 978-1118749616 | 1176 Pages | PDF | 28 MB


Prepare for the new CCNA exams with this Todd Lammle study guide
Cisco author, speaker, and trainer Todd Lammle is considered the authority on all things networking, and his books have sold almost a million copies worldwide. This all-purpose CCNA study guide methodically covers all the objectives of the ICND1 (100-101) and ICND2 (200-101) exams as well as providing additional insight for those taking CCNA Composite (200-120) exam. It thoroughly examines operation of IP data networks, LAN switching technologies, IP addressing (IPv4/IPv6), IP routing technologies, IP services, network device security, troubleshooting, and WAN technologies.
Valuable study tools such as a companion test engine that includes hundreds of sample questions, a pre-assessment test, and multiple practice exams. Plus, you’ll also get access to hundreds of electronic flashcards, author files, and a network simulator. * CCNA candidates may choose to take either the ICND1(100-101) and ICND2 (200-101) exams or the CCNA Composite exam (200-120); this study guide covers the full objectives of all three * Written by bestselling Sybex study guide author Todd Lammle, an acknowledged authority on all things Cisco * Covers essential Cisco networking topics such as operating an IP data network, IP addressing, switching and routing technologies, troubleshooting, network device security, and much more * Includes a comprehensive set of study tools including practice exams, electronic flashcards, comprehensive glossary of key terms, videos, and a network simulator that can be used with the book s hands-on labs * Bonus Content: Access to over 40 MicroNugget videos from CBT Nuggets
CCNA Routing and Switching Study Guide prepares you for CCNA certification success.

+

Internet Protocol Version 6 (IPv6)

So what do you think are the odds that two hosts will assign themselves the same random IPv6 address? Personally, I think you could probably win the lotto every day for a year and still not come close to the odds against two hosts on the same data link duplicating an IPv6 address! Still, to make sure this doesn’t ever happen, duplicate address detection (DAD) was created, which isn’t an actual protocol, but a function of the NS/NA messages. Figure 14.11 shows how a host sends an NDP NS when it receives or creates an IPv6 address.

When hosts make up or receive an IPv6 address, they send three DADs out via NDP NS asking if anyone has this same address. The odds are unlikely that this will ever happen, but they ask anyway.