Download or read book CCNA Voice 640-461 written by Jeremy Cioara and published by Cisco Press. This book was released on 2011 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn, prepare, and practice for exam success, master CCNA voice 640-461 exam topics, and assess your knowledge with chapter-opening quizzes. Review key concepts with exam preparation tasks and practice with realistic exam questions on the CD-ROM.