Реализация в компьютерных сетях технологий QoS (Quality of Service) обеспечивает надежную доставку данных приложений посредством контроля за доступом к сети, задержкой, потерей, качеством передаваемых пакетов и пропускной способностью каналов передачи информации. Функции QoS являются неотъемлемой частью современных легкомасштабируемых сетей IP. Глубокое знание основных концепций и возможностей технологий QoS позволит сетевым планировщикам, разработчикам и инженерам максимально оптимизировать производительность сетей и обеспечить стабильное функционирование нового поколения мультимедийных и голосовых приложений. Эта книга является источником чрезвычайно полезной информации для всех, кто планирует развертывание служб QoS в сетях, построенных на базе оборудования компании Cisco Systems. Автор проводит исчерпывающий обзор возможностей и функций QoS в сетях IP, не забывая при этом о поучительных практических упражнениях и примерах конфигурации устройств. Основной акцент делается на обсуждении реальных задач, что не только познакомит читателя с различными теоретическими концепциями, но и научит его решать наиболее распространенные проблемы проектирования. Книга рассчитана на пользователей высокой квалификации и профессионалов.

The Cisco IP Telephony focused certification tracks validate proficiency in designing, installing, and supporting a multiservice network solution. A solid understanding of quality-of-service (QoS) features and implementation is essential for all of the Cisco IP Telephony focused certifications and is also a core component of the CCIP certification.

Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics. While QoS has become an essential technology for those organizations rolling out a new generation of network applications such as real-time voice communications and high-quality video delivery, most of the literature available on this foundation technology for current and future business applications focuses on IP QoS. Equally important is the application of QoS in the campus LAN environment, which is primarily responsible for delivering traffic to the desktop. Cisco Catalyst QoS is the first book to concentrate exclusively on the application of QoS in the campus environment. This practical guide provides you with insight into the operation of QoS on the most popular and widely deployed LAN devices: the Cisco Catalyst family of switches. Leveraging the authors' extensive expertise at Cisco in the support of Cisco Catalyst switches and QoS deployment, the book presents QoS from the campus LAN perspective. It explains why QoS is essential in this environment in order to achieve a more deterministic behavior for traffic when implementing voice, video, or other delay-sensitive applications. Through architectural overviews, configuration examples, real-world deployment case studies, and summaries of common pitfalls, you will understand how QoS operates, the different components involved in making QoS possible, and how QoS can be implemented on the various Cisco Catalyst platforms to enable truly successful end-to-end QoS applications. This book is part of the Networking Technology Series from Cisco Press, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.

IPSec VPN Design consists of three main sections. The first section provides a comprehensive introduction to the IPSec protocol, including IPSec Peer Models. This section also includes an introduction to site-to-site, network-based, and remote access VPNs. The second section is dedicated to an analysis of IPSec VPN architecture and proper design methodologies. Peer relationships and fault tolerance models and architectures are examined in detail. Part three addresses enabling VPN services, such as performance, scalability, packet processing, QoS, multicast, and security. This book also covers the integration of IPSec VPNs with other Layer 3 (MPLS VPN) and Layer 2 (Frame Relay, ATM) technologies; and discusses management, provisioning, and troubleshooting techniques. Case studies highlight design, implementation, and management advice to be applied in both service provider and enterprise environments.

End-to-End QoS Network Design is a detailed handbook for planning and deploying QoS solutions to address current business needs. This book goes beyond discussing available QoS technologies and considers detailed design examples that illustrate where, when, and how to deploy various QoS features to provide validated and tested solutions for voice, video, and critical data over the LAN, WAN, and VPN.

The second edition of Cisco Voice Over IP (CVOICE) provides readers with all the critical information needed to implement and support data and voice integration solutions at the network-access level. In addition, this book prepares the reader for the CVOICE certification exam 642-432, which applies to multiple Cisco IP Telephony Specialist certifications and the Cisco Certified Voice Professional (CCVP) certification. The book is based on the 5.0 curriculum, and has extra coverage on particularly tough areas of that course, such as H.323 gateway/gatekeeper and QoS configuration. This book will serve readers as a valuable study aid and an invaluable theory, configuration, and troubleshooting reference. Coverage starts with a review for readers new to voice technologies and continues with in-depth information on implementation, concepts and protocols, call control models available, roadblock and troubleshooting strategies, and QoS issues. The book also expands beyond the curriculum to cover topics such as WRR, AutoQoS on a Catalyst switch, LFI, using MQC to configure classification, marking, LLQ, WRED, policing, and shaping. How does the book differ from the previous edition? It includes updated coverage of voice technologies, IOS version 12.3 updates including AutoQoS, H.323 enhancements, MGCP enhancements, and SIP enhancements, and practical editorial elements like hands-on lab exercises and configuration examples are given greater emphasis.

В данном вводном курсе рассматриваются фундаментальные вопросы построения сетей передачи данных. Роль компьютерных сетей в телекоммуникационном мире. Локальные (LAN), городские (MAN) и глобальные сети (WAN). Сети операторов связи и корпоративные сети. Методы мультиплексирования. Коммутация пакетов и каналов. Открытые системы и модель OSI. Типы и характеристики линий связи. Методы передачи дискретной информации. Качество обслуживания в пакетных сетях (QoS).

The book starts with a technology refresher for each of the technologies covered in the design studies, including VPNs, TE, QoS, multicast, Pseudowires, network recovery, and IPv6. Following this overview are detailed design studies, each based on a set of characteristics and objectives common to a profile of networks deploying MPLS. The book contains a design study for an Inter-eXchange Carrier (IXC), a national telco, a Global Service Provider, and an enterprise. The authors develop each design study in a consistent manner, starting with a description of the network environment and supported services. They then identify the objectives that influenced the design. Each study then details all aspects of the network design using the latest MPLS technologies. Finally, a number of lessons to be drawn from the design study are pointed out, allowing readers to apply the solutions that meet their needs.