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Here is the List of some of the very useful sites which contains free online books on CCNA , CCNP, CCIE , VoIp , IP Telephony

Free online Books and tutorials on CCNA

1. CCNA 640-607 Certification Guide :  ( free in PDF format ) (Tutorials)
   It is an excellent guide for the preparation of CCNA  (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

2. Sybex CCNA 3.0 Study Guide :  ( free in PDF format ) (BOOKs)
   Though written for those already familiar with technology, it nonetheless manages to clearly explain what makes networks work without undercutting their inherent complexity. Authors Lammle and Chellis set the stage by going through such fundamentals as local area network (LAN) devices, the Open Systems Interconnection (OSI) model, and various data transport protocols. From there, the book delves into such topics as network congestion--what causes it and what to do about it--Internet protocol (IP) addressing and subnetting, interior routing protocols, and basic routing configuration. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

3. Cisco CCNA Exam: ( free in PDF  format ) ( Books)
   This book covers network theory, devices, protocols, and other technologies. There's an emphasis on IP addressing, routing, and security, and plenty of coverage of how to do things at the Internetwork Operating System (IOS) command line. Frame Relay and Novell IPX get covered, too. .(Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

4. Sybex CCNA 5th Edition : ( free in PDF format ) (Tutorials)
   It is an excellent guide for the preparation of CCNA  (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

Free online Books and tutorials on CCNP

1. Cisco CCNP Remote Access Exam Certification Guide: ( free in PDF format ) (BOOK)
   Coverage of all CCNP and CCDP Remote Access exam topics enables you to identify and fill your knowledge gaps before the exam date. You'll learn to:
   * Determine site requirements in a central office, branch office, and small/remote or home office, and select the proper Cisco network devices for remote access purposes
   * Deploy physical connectivity of the WAN devices necessary for remote access purposes. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/)
2. Cisco CCNP Routing Exam Certification Guide :  ( free in PDF format ) (BOOK)
   The book covers all major topics on the exam, including extending IP addresses, routing principles, scalable routing protocols, managing traffic and access, and optimizing scalable internetworks. A step-by-step way to master the skills and concepts tested on the exam, including routing principles and extending IP addresses. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/)
3. Cisco CCNP Support Exam Certification Guide :( free in PDF format ) (BOOK)
   The book covers all major topics on the exam, including extending IP addresses, routing principles, scalable routing protocols, managing traffic and access, and optimizing scalable internetworks. A step-by-step way to master the skills and concepts tested on the exam, including routing principles and extending IP addresses. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
4. Cisco CCNP Switching Exam Certification Guide :  ( free in PDF format ) (Book)
   This book teaches : Design, build, and maintain high-speed, multilayer switched networks running Fast and Gigabit Ethernet .Define common workgroups and configure and manage Virtual LANs with VTP .Utilize redundant switch links to increase campus network reliability .Understand ATM and use LAN Emulation (LANE) technology for trunking
   Control network traffic with access policies
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
5. Cisco Press - Ccnp 642-811 - Bcmsn Exam Certification Guide – 2004 : ( free in PDF format ) (Book)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
6. Cisco Press - CCNP - 642-821 - BCRAN (2005) : ( free in PDF format ) (Book)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
7. Cisco Press - CCNP 642-831 CIT Exam Certification Guide.2nd.2004: ( free in PDF format ) (Book)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

Free online Books and tutorials on CCIE

1. E-book Cisco CCIE Fundamentals-Network-Design [Mirror] :( free in PDF format ) (BOOK)
   The book outlines the design trends governing those networks today and explains the devices used to create them and their functions, as well as effective ways to integrate the three. Book covers such as Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) redistribution, reducing Service Advertising Protocol (SAP) traffic in Novell Internetwork Packet Exchange (IPX) networks, and User Datagram Protocol (UDP) broadcast flooding--and propose configuration solutions to fix them. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/)

2. E-book Cisco Multicast Routing ∓ Switching  : ( free in PDF format ) (BOOK)
   This book covers The important protocols for multicast service are covered in detail, including: Internet Group Management Protocol (IGMP); Cisco Group Management Protocol (DGMP); Distance Vector Multicast Routing Protocol (DVMRP); Protocol Independent Multicast Protocol (PIM); Resource ReSerVation Protocol (RSVP). A complete understanding of unicast, broadcast, and multicast IP addressing; Step-by-step guidance on how to deploy and troubleshoot multicasting in a Cisco environment; Complete coverage of current and future intranet multicast routing. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

3. Cisco Press - CCIE - CCIE Fundamentals - Network Design and Case Studies : ( free in PDF format ) (BOOK)
   Part 1: Internetwork Design provides a set of general guidelines for planning internetworks and specific suggestions for several key internetworking implementations. Part 1 focuses on identifying the essential technologies and appropriate implementations for specific environments. Part 2: Internetworking Case Studies provides practical examples illustrating how readers can implement Cisco Systems software features. Case studies address implementation concerns and show how to apply features. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

4. Cisco Press - CCIE Professional Development - Advanced IP Network Design :( free in PDF format ) (BOOK)
   This book is very good for preparation of CCIE it covers Advanced Ip Networks. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

5. Cisco Press - CCIE Professional Development – Routing TCP/IP Volume-1: ( free in PDF format ) (BOOK)
   This book covers the Routing using TCP/IP this is first part in the series. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

6. Cisco Press - CCIE Professional Development – Routing TCP/IP Volume-2: ( free in PDF format ) (BOOK)
   This book covers the Routing using TCP/IP this is Second part in the series. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
7. CCIE Notes From Experience : ( free in PDF format ) (Tutorials)
   It provides the notes made by the peoples who has lot of experience in this field .(Link taken From http://rtfm.rdslink.ro/Books/Cisco/)
8. Cisco Press - Internet Routing Architectures, Second Edition : ( free in PDF format ) (Tutorials)
   It is an excellent free book on Building Scalable Cisco Networks. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

9. Cisco Press CCIE 350-001 Routing and Switching Prep Kit: ( free in PDF format ) (BOOK)
    This book covers all necessary objectives for the exam with a tutorial text that is strictly exam-related and flows with minimal interruption. Study aids begin with the Chapter Opener, which readies you for learning. To help you fully understand the topic, visual cues are used liberally throughout the book. Diagrams put concepts into a visual form that aids in retaining and comprehending, and figures confirm your understanding of procedures.  (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

10. Cisco IOS Reference Guide :( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
11. Sybex - Cisco CCIE Book : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

Free online Books and tutorials on IP Telephony and VoIP

1. Syngress Configuring Cisco VoIP :( free in PDF format ) (BOOK)
   The book is organized around the configuration of all of Cisco's core VoIP products, including the voice/fax feature card, integrated access system, voice manager, and the voice-enabled Cisco 2600 and 3600 series. Anyone responsible for the actual installation, configuration, and troubleshooting of a Cisco VoIP device will find this book invaluable. As with all Syngress Media books, online chapter updates will be published three to six months after publication. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

2. Cisco IP Telephony Network Design Guide :( free in PDF format ) (BOOK)
   It contains all the concepts related to Cisco IP telephony.(Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
3. Cisco IP Telephony QoS Design Guide :( free in PDF format ) (BOOK)
   It contains all the concepts related to Cisco IP telephony. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
4. IP Telephony Solution Guide :( free in PDF format ) (BOOK)
   This book teaches all the concepts of IP Telophony (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

5. Syngress Cisco AVVID & IP Telephony Design & Implementation : ( free in ZIP format ) (BOOK)
   Cisco AVVID Design and Implementation is a complete reference for network administrators and engineers responsible for a complicated AVVID network. This book covers history, protocols, hardware, servers, switches, bridges, and routers, and discusses implementation issues, realities of cost, requirements, and network limitations. Engineers will learn how to design and build a comprehensive Cisco AVVID network infrastructure. Second in a series, this book is designed as the next-step for readers who have read the well-received Configuring Cisco AVVID Architecture for Voice, Video, and Integrated Data. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
   

Free online Books and tutorials on Network Security/PIX Firewall

1. Router Security Guidance Activity : ( free in PDF format ) (BOOK)
   A text for administrators describing in detail how to detect network security accidents and eliminate them. Shows how to measure security vulnerabilities and manage security policy in an extended organization, as well discussing the Cisco products available for security protection, such as firewalls and policy managers .(Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
2. Syngress Managing Cisco Network Security : ( free in PDF format ) (BOOK)
   It covers the topics
   Cisco Secure PIX Firewall ,Cisco Secure Access Control Server ,Cisco Secure Integrated Software ,Cisco Secure Scanner ,Cisco Secure Integrated VPN Software ,Cisco Secure Intrusion Detection System , Cisco Secure VPN Client ,Cisco Secure Policy Manager
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
3. CCSP Cisco Secure PIX Firewall Advanced Exam Certification Guide : ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
4. Cisco Secure PIX Firewall Fundamentals Advanced : ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
5. CCSP SCURE Exam Certification Self Study Guide: ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
6. Cisco PIX 6.0 Firewall - Configuration Guide : ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
7. Ccsp Cisco Secure Pix Firewall Fundamentals 1.11 : ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
8. Cisco Press Cisco Secure Internet Security Solutions: ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
9. Paraglyph Press Cisco Network Security : ( free in PDF format ) (BOOK)
   An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
10. Network Security : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
11. Syngress Cisco Security Specialist Guide to PIX : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
12. Syngress Hack Proofing Your Identity in the Information Age 2002 : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
13. Cisco - Designing Network Security : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
14. Security Plus Fast Pass : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
15. Network Security : ( free in PDF format ) (BOOK)
    An excellent book on the Subject. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )

Other Books and tutorials on Cisco Technology

1. Understanding TCP/IP : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
2. BGP Case Studies : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
3. Subnetting Scenarios : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
4. NAT Multihoming Example : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
5. IP Subnetting : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
6. IP Protocol : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
7. EIGRP White Paper : ( free in PDF format) (Tutorial)
   (Link taken From http://rtfm.rdslink.ro/Books/Cisco/)
8. Networking Cisco IP Routing Fundamentals :( free in PDF format ) (BOOK)
   Very good free book on IP rounting. (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
9. Well Known Port No : ( free in PDF format) (Tutorial)
   (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
10. Wireless Area Network Book : ( free in PDF format) (Tutorial)
    (Link taken From http://www.ssuet.edu.pk/%7Eamkhan/ )
    

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I take no responsibility of the material accessible threw this site.None of the book is hosted on this site . I am only providing link to the books hosted on other site which i found by doing extensive search on google.I take no responsibility for the legality of these books.You can check the websites from where the link has takes for the term and conditions for downloading these books.If any one is suffering financial loss due to this then drop a mail to me I will remove the link of that book.