Book Description

Best practices for Postfix–the popular alternative to Sendmail.

Developed with security and speed in mind, Postfix has become a popular alternative to Sendmail and comes preinstalled in many Linux distributions as the default mailer. The Book of Postfix is a complete guide to Postfix whether used at home, as a mailrelay or virus-scanning gateway, or as a company mailserver. Practical examples show how to deal with daily challenges like protecting mail users from spam and viruses, managing multiple domains, and offering roaming access.

Table of Contents
Introduction
Chapter 1. Preparing Your Host and Environment
Chapter 2. Mailserver for a Single Domain
Chapter 3. Dial-up Solution
Chapter 4. Understanding Restrictions
Chapter 5. Restrictions
Chapter 6. Understanding Checks
Chapter 7. Checks
Chapter 8. Understanding Filters
Chapter 9. Filters
Chapter 10. Mailrelay
Chapter 11. A Smart Mailrelay
Chapter 12. Filters Download Now »

Book Description

A Day-by-Day Review Guide for the CompTIA A+ 220-701 and 220-702 Exams

31 Days Before Your CompTIA^® A+ Exams, Second Edition offers you a personable and practical way to understand the certification process, commit to taking the exam, and finish your preparation using a variety of study resources.

The 31-Day format breaks down key exam topics into 31 daily review sessions using short summaries, lists, tables, examples, and graphics. This edition includes a Study Resources section at the end of each day that provides you with a quick reference for locating more in-depth treatment of a day’s topics within relevant textbook resources.

Use this day-by-day guide to organize, prepare, and review all the CompTIA A+ objectives for the CompTIA A+ Essentials exam (220-701) and the CompTIA A+ Practical Application exam (220-702).

• The features of the book empower you to fit exam preparation into an otherwise busy schedule:
• Tear-out visual calendar summarizes each day’s study topics
• Checklist highlights important tasks and deadlines leading up to your exam
• Description of the CompTIA A+ exams and sign-up process
• Strategies from the author help you to be mentally, organizationally, and physically prepared for exam day
• Conversational tone makes your study time more enjoyable

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Book Description

Trust the best selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. They are built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam.

CCNA Voice 640-461 Official Cert Guide presents you with an organized test preparation routine through the use of proven series elements and techniques. “Do I Know This Already?” quizzes open each chapter and enable you to decide how much time you need to spend on each section. Exam topic lists make referencing easy. Chapter-ending Exam Preparation Tasks help you drill on key concepts you must know thoroughly.

• Master Cisco CCNA Voice 640-461 exam topics
• Assess your knowledge with chapter-opening quizzes
• Review key concepts with exam preparation tasks
• Practice with realistic exam questions on the CD-ROM

CCNA Voice 640-461 Official Cert Guide focuses specifically on the objectives for the CCNA Voice ICOMM exam. Senior voice consultants and trainers Jeremy Cioara and Michael Valentine share preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics.

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Book Description

Providing a comprehensive overview of the modelling, analysis and simulation of mobile radio channels, this book gives a detailed understanding of fundamental issues and examines state-of-the-art techniques in mobile radio channel modelling. It analyses several mobile fading channels, including terrestrial and satellite flat-fading channels, various types of wideband channels and advanced MIMO channels, providing a fundamental understanding of the issues currently being investigated in the field.

Important classes of narrowband, wideband, and space-time wireless channels are explored in detail with descriptions of efficient simulation methods for mobile radio channels being central. Strong emphasis is placed on the detailed origin of the presented channel models and a high degree of mathematical unity is conveyed. Using the described channel models, the reader can evaluate the performance of wireless communication systems under propagation conditions which are typical for multipath channels in various environments.

• Introduces the fundamentals of stochastic and deterministic channel models
• Explores the modelling and simulation of both wideband and narrowband mobile radio channels as well as several classes of MIMO channels
• Describes general concepts including geometrical, reference and simulation models
• Discusses several methods for the modelling of given Doppler, delay, and angular profiles
• Elaborates on methods for the design, analysis, and realisation of efficient channel simulators
• Examines techniques for the development of fast channel simulators Download Now »

Book Description

A self-contained guide to coordinated multi-point (CoMP), this comprehensive book covers everything from theoretical basics to practical implementation. Addressing a wide range of topics, it highlights the potential gains of CoMP, the fundamental degrees of freedom involved and the key challenges of using CoMP in practice. The editors and contributors bring unique real-world experience from running the world’s first and largest test beds for LTE-Advanced, and recent field trial results from these tests are presented. With detailed insight into the realistic potential of CoMP as a key technology for LTE-Advanced and beyond, this is a must-read resource for professionals and students who want the big picture on CoMP or require in-depth knowledge of how to build cellular communication systems for the future.

Review
“Interference is the limiting factor in cellular communications and smart coordination of transmission can lead to significant improvements in quality of service. This book provides a strong outline and lays out some of the fundamental assumptions and theoretical models to treat the subject and supports the theory with result from system-level test benches and field measurements. I recommend this book to everyone interested in the topic.”
–Siavash M. Alamouti, Vodafone Group R&D Director

“Coordinated Multi-Point in Mobile Communications is a must read Download Now »

Book Description

Sametime 8.5.2 delivers a state-of-the-art enterprise-ready instant messaging and meeting service. This Administrator’s Guide navigates through the range of Sametime server components and features, providing you with the essential information required to install, administer and troubleshoot your Sametime 8.5.2 environment.The IBM Sametime 8.5.2 Administration Guide cuts through the complexity of architecting, installing, and administering all the moving parts of the latest version of Sametime. With this book, you will be able to make the necessary decisions when it comes to choosing which server components you need and how to install them to get the most performance and maintainability from the software. Starting with an overview of Sametime 8.5.2, you will then dive into each server component. You learn what each one does, why it might be needed in your environment, and what you need to have in place to run it. By the end, you’ll have Sametime running and configured properly for your particular situation.With flexibility comes complexity– but not with this guide. You’ll learn how different architectures are possible and how to prepare properly for the installation of Sametime. You’ll learn how to install the servers in the right order so that you can maintain and expand your environment in the future. You’ll also find out how best to monitor your Sametime environment for issues, as well as how to effectively troubleshoot those problems so that you can quickly get Sametime running again.The IBM Sametime 8.5.2 Administration Guide is the perfect one-stop resource for learning important installation and configuration details quickly and easily.

What you will learn from this book: Download Now »