Packet switching

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  • Principles Circuit switching designed for voice Resources dedicated to a particular call Much of the time a data connection is idle Data rate is fixed Both ends must operate at the same rate

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  • Current estimates and measurements predict that Internet traffic will continue to grow for many years to come. Driving this growth is the fact that the Internet has moved from a convenience to a mission-critical platform for conducting and succeeding in business. In addition, the provision of advanced broadband services to end users will continue to cultivate and prolong this growth in the future.

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  • Data transmitted in small packets Typically 1000 octets Longer messages split into series of packets Each packet contains a portion of user data plus some control info Control info Routing (addressing) info Packets are received, stored briefly (buffered) and past on to the next node Store and forward

    ppt50p trada85 18-01-2013 23 3   Download

  • Optical Switching Networks describes all the major switching paradigms developed for modern optical networks, discussing their operation, advantages, disadvantages, and implementation. Following a review of the evolution of optical wavelength division multiplexing (WDM) networks, an overview of the future of optical networks is set out.

    pdf343p daokim 04-08-2009 269 134   Download

  • ATM is a packet-switched technology based on a 53-byte packet called a cell. Each cell is divided into a 5-byte header and a 48-byte payload. The short, fixed length cell reduces delay and jitter, allowing time sensitive information such as voice and video to be transported along with data. There are various transmission media and rates available with bandwidth measured in megabits to gigabits.

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  • Message switching: In message switching no physical path is established in advance between sender and receiver. Instead, it is sent and stored in the first switching office (i.e., router) and then forwarded later, one hop at a time. Each block is received in its entirety, inspected for errors, and then retransmitted. Telegrams were message switching. This technique needs routers with big buffers and also a single block may tie up a router- router line for minutes, useless for interactive traffic. Packet switching gets round this problem. ...

    pdf7p doxuan 13-07-2009 196 38   Download

  • Similarities between ATM and packet switching Transfer of data in discrete chunks Multiple logical connections over single physical interface In ATM flow on each logical connection is in fixed sized packets called cells Minimal error and flow control Reduced overhead Data rates (physical layer) 25.6Mbps to 622.08Mbps

    ppt62p trada85 18-01-2013 36 5   Download

  • (BQ) Part 1 book "Computer networks - A systems approach" has contents: Foundation, direct link networks, packet switching, internetworking, requirements, network architecture, implementing network software, hardware building blocks, switching and forwarding, implementation and performance,...and other contents.

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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 Outage Performance of Flexible OFDM Schemes in Packet-Switched Transmissions

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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 Optimal Channel Selection for Spectrum-Agile Low-Power Wireless Packet Switched Networks in Unlicensed Band

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  • Packet Tracer là một phần mềm giả lập mạng dùng trong học tập sử dụng các thiết bị mạng (router/switch) của Cisco. Để cấu hình Router thì đầu tiên ta dùng một PC truy cập vào Router bằng phương pháp liên kết HYPER TERMINAL. Mời các bạn tham khảo tài liệu.

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  • LAN and Ethernet switches are usually considered as plumbing. They are easy to install and configure, but it is easy to forget about security when things appear to be simple. Multiple vulnerabilities exist in Ethernet switches. Attack tools to exploit them started to appear a couple of years ago (for example, the well-known dsniff package). By using those attack tools, a hacker can defeat the security myth of a switch, which incorrectly states that sniffing and packet interception are impossible with a switch.

    pdf361p vusuakhonghat 28-05-2009 543 251   Download

  • Catalyst switch có thể cung cấp nguồn cho các IP phones, hình thành các kết nối trunking với IP phones, cung cấp một mức độ QoS cho các voice packets. Một thiết bị Cisco IP Phones cũng giống như tất cả các node khác trong hệ thống mạng ở chổ thiết bị phải có nguồn điện để hoạt động. Nguồn điện có thể đến từ hai nơi: Từ một nguồn AC adapter. Từ nguồn DC trích ra từ cáp mạng (data cable).

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  • Packet Tracer là một phần mềm giả lập mạng dùng trong học tập sử dụng các thiết bị mạng (router/switch) của Cisco. Nó được hãng Cisco cung cấp miễn phí cho các trường lớp, sinh viên đang giảng dạy/theo học chương trình mạng của Cisco. Tài liệu này sẽ trình bày một số hướng dẫn cơ bản để sử dụng phần mềm Packet Tracer, mời các bạn cùng tham khảo.

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  • Soon after Samuel Morse’s telegraphing device led to a deployed electrical telecommunications system in 1843, waiting lines began to form by those wanting to use the system. At this writing queueing is still a significant factor designing and operating communications services, whether they are provided over the Internet or by other means, such as circuit switched networks.

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  • General Packet Radio Service (GPRS) Packet data transmission has already been standardized in GSM phase 2, offering access to the Packet Switched Public Data Network (PSPDN); see Sections 9.5.3 and 9.6.2. However, on the air interface such access occupies a complete circuit switched traf®c channel for the entire call period. In case of bursty traf®c (e.g. Internet traf®c), such access leads to a highly inef®cient resource utilization. It is obvious that in this case, packet switched bearer services result in a much better utilization of the traf®c channels.

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  • Navigating the migration of circuit switched to packet switched networks is a complex affair. In pursuit of improving overall network efficiency and making advanced data services available, service providers must simultaneously protect existing TDM revenue while investing in new packet-based technologies. The good news is that the circuit switched architecture, which accounts for the bulk of service provider revenues, is highly reliable. The bad news is that this massive centralized processing network is neither fully depreciated nor built for packet switching.

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  • What an Ethernet Switch Does Bridges and Switches What Is a Switch? Operation of Ethernet Switches Transparent Bridging Address Learning Traffic Filtering Frame Flooding Broadcast and Multicast Traffic Combining Switches Forwarding Loops Spanning Tree Protocol Spanning Tree Packets Choosing a Root Bridge Choosing the Least-Cost Path Blocking Loop Paths Spanning Tree Port States Spanning Tree Versions Switch Performance Issues Packet Forwarding Performance Switch Port Memory

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  • This chapter identify a router as a computer with an OS and hardware designed for the routing process; demonstrate the ability to configure devices and apply addresses; describe the structure of a routing table; describe how a router determines a path and switches packets.

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  • Chapter 1 introduce to Routing and Packet Forwarding. This chapter identify a router as a computer with an OS and hard ware designed for the routing process. Demonstrate the ability to configure devices and apply addresses. Describe the structure of a routing table. Describe how a router determines a path and switches packets.

    ppt41p youcanletgo_01 30-12-2015 12 1   Download


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