Networking concepts

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  • -A network can be defined as a group of computers and other devices connected in some ways so as to be able to exchange data. -Each of the devices on the network can be thought of as a node; each node has a unique address. -Addresses are numeric quantities that are easy for computers to work with, but not for humans to remember. Example: 204.160.241.98 -Some networks also provide names that humans can more easily remember than numbers. Example: www.javasoft.com, corresponding to the above numeric address. Internet address Consists of 4 bytes separated by periods Example: 136.102.233.

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  • In a prior edition of this book the preface commenced with the paraphrase of an old adage in an era of evolving local area networking technology: Ethernet is dead—long live Ethernet! Although advances in communications technology continue to occur at a rapid pace, that paraphrase continues to be valid. Within the past decade, the bandwidth of 10 Mbps Ethernet was advanced by a factor of one thousandwith the introduction of a series of enhancements to the original Ethernet specification. First, Fast Ethernet resulted in the bandwidth of Ethernet increasing by a factor of 10 to 100 Mbps.

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  • According to Eric Vanderburg of certmag.com, the CCNA is “Cisco's introductory certification and the one in greatest demand. Cisco products often are the first thought when choosing network infrastructure equipment, and they are immensely prevalent, creating a vast need for professionals who are capable of managing them.” On June 25, 2007, Cisco announced major updates to their CCNA curricula, including the new version of the CCNA Composite Exam (640- 802 CCNA).

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  • Cisco Certified Network Associate (CCNA®) validates the ability to install, configure, operate, and troubleshoot medium-size route and switched networks, including implementation and verification of connections to remote sites in a WAN. CCNA curriculum includes basic mitigation of security threats, introduction to wireless networking concepts and terminology, and performance-based skills.

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  • This chapter aims to introduce the basic concepts of satellite networking including appli- cations and services, circuit and packet switching, broadband networks, network protocols and reference models, characteristics of satellite networks, internetworking between satellite and terrestrial networks and convergence of network technologies and protocols. When you have completed this chapter, you should be able to:

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  • Ad hoc networks: Concept, Routing, Problem, DSDV (Destination Sequenced Distance Vector), Ad-hoc On-demand Distance Vector (AODV), DSR (Dynamic Source Routing), Further alternatives. Mobile transport layer: Motivation, Approaches for improvement, Indirect TCP, Snooping TCP, Mobile TCP, Selective retransmission; Comparison; Recommended TCP improvements for 2.5G/3G wireless.

     

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  • Before considering how to configure Cisco routers and switches, you must be introduced to basic networking concepts you’ll need to understand in order to grasp the advanced concepts discussed in later chapters. The OSI Reference Model is the best place to start, since it will help you understand how information is transferred between networking devices. Of the seven layers in the OSI Reference Model, be especially sure to understand how the bottom three layers function, since most networking devices function at these layers.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Dynamic Resource Assignment and Cooperative Relaying in Cellular Networks: Concept and Performance Assessment

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  • When the concept of a network without wires was first suggested more than two decades ago, it sparked the imagination of scientists, product vendors, and users around the globe eager for the convenience and flexibility of a free roaming connection. Unfortunately, as the variety of wireless solutions began to emerge, anticipation turned to disappointment.The first wave of solutions proved inadequate for the networking, portability, and security needs of a changing IT environment.

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  • This product will provide you questions and answers along with detailed explanations carefully compiled and written by our experts. Try to understand the concepts behind the questions instead of just cramming the questions. Go through the entire document at least twice so that you make sure that you are not missing anything.

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  • The world of IT is always evolving, but in every area there are stable, core concepts that anyone just setting out needed to know last year, needs to know this year, and will still need to know next year. The purpose of the Foundations series is to identify these concepts and present them in a way that gives you the strongest possible starting point, no matter what your endeavor. Network Security Foundations provides essential knowledge about the principles and techniques used to protect computers and networks from hackers, viruses, and other threats.

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  • So you have worked on Cisco routers and switches for a while and now want to get your CCIE? There are several good reasons to do so. Cisco’s certification program allows network analysts and engineers to demonstrate competence in different areas and levels of internetworking. Cisco certification can help you land a job or increase your pay because clients, peers, and superiors recognize you as a networking expert. CCIE certification is regarded as the most difficult and rewarding of the internetworking industry.

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  • This document provides design considerations and guidelines for implementing Cisco Quality of Service within an enterprise environment. This document is the second major update to the design guidelines and information presented in the Cisco AVVID Network Infrastructure Enterprise Quality of Service Design Solutions Reference Network Design (August, 2002). This document assumes that you are already familiar with Quality of Service terms and concepts. If you want to review any of those terms and concepts, refer to Cisco Quality of Service documentation at:...

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  • This exam is for use with regular CCNA classes taught by local academies to high school and college students. The skills-based exam consists of three parts; 1) Cable Build and Test, 2) Network Concepts and 3) Network Connection. All three should be completed (total possible of 100 points) and the total score combined with the Semester 1 online assessment exam to establish a course grade. Scores from chapter exams and completion of labs as well as points for participation and attendance may also count toward the final grade....

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  • This exam is for use with regular CCNA classes taught by local academies to high school and college students. The skills-based exam consists of three parts; 1) Router Configuration, 2) Troubleshooting and 3) Network Concepts. All three should be completed (total possible of 100 points) and the total score combined with the Semester 2 online assessment exam to establish a course grade. Scores from chapter exams and completion of labs, as well as points for participation and attendance may also count toward the final grade....

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  • This exam is for use with regular CCNA classes taught by local academies to high school and college students. The skills-based exam consists of three parts; 1) Router Configuration, 2) Subnetting, 3) Network Concepts. All three parts should be completed (total possible of 100 points) and the total score combined with the Semester 4 online assessment exam to establish a course grade. Scores from chapter exams and completion of labs, as well as points for participation and attendance may also count toward the final grade....

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  • This paper describes an architecture for differentiation of Quality of Service in heterogeneous wireless-wired networks. This architecture applies an “all-IP” paradigm, with embedded mobility of users. The architecture allows for multiple types of access networks, and enables user roaming between different operator domains.

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  • This document provides design considerations and guidelines for implementing Cisco IP Telephony solutions based on the Cisco Architecture for Voice, Video, and Integrated Data (AVVID). This document is primarily an update of the design guidelines and information presented in the Cisco IP Telephony Solution Reference Network Design (SRND) for Cisco CallManager releases 3.1 and 3.2, which is available online at http://cisco.com/go/srnd This document assumes that you are already familiar with the terms and concepts presented in previous versions of the Cisco IP Telephony SRND.

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  • Our goal in writing Network Intrusion Detection, Third Edition has been to empower you as an analyst. We believe that if you read this book cover to cover, and put the material into practice as you go, you will be ready to enter the world of intrusion analysis. Many people have read our books, or attended our live class offered by SANS, and the lights have gone on; then, they are off to the races. We will cover the technical material, the workings of TCP/IP, and also make every effort to help you understand how an analyst thinks through dozens of examples....

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  • This exam is for use with regular CCNA classes taught by local academies to high school and college students. The skills-based exam consists of three parts; 1) Router Configuration and 2) Troubleshooting and 3) Network Concepts. All 3 parts should be completed (total possible of 100 points) and the total score combined with the Semester 3 online assessment exam to establish a course grade. Scores from chapter exams and completion of labs, as well as points for participation and attendance may also count toward the final grade....

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