The network layer

This thesis proposes and implements a new and novel solution on simulators and real devices to solve the mobility problem in a VPN. The new solution adds mobility support to existing L2TP/IPsec (Layer 2 Tunneling Protocol/IP Security) tunnels. The new solution tunnels Layer 2 packets between VPN clients and a VPN server without using Mobile IP, without incurring tunnel-re-establishment at handoff, without losing packets during handoff, achieves better security than current mobility solutions for VPN, and supports fast handoff in IPv4 networks.

123p runthenight07 01-03-2023 5 4   Download

Upon completion you will be able to: Understand the difference between an internet and an extranet, understand private, hybrid, and virtual private networks, understand how VPN can guarantee privacy, understand the mechanism of NAT.

14p tangtuy09 26-04-2016 74 7   Download

In this chapter we discuss our first client/server application program, Dynamic Host Configuration Protocol (DHCP). This application is discussed first because it is the first client/server application program that is used after a host is booted. In other words, it serves as a bootstrap when a host is booted and supposed to be connected to the Internet, but the host does not know its IP address.

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This chapter is an introduction to the application layer. In the next eight chapters we introduce common client-server applications used in the Internet. In this chapter, we give a general picture of how a client-server program is designed and give some simple codes of their implementation. The area of network programming is a very vast and complicated one; it cannot be covered in one chapter. We need to give a bird’s-eye view of this discipline to make the contents of the next eight chapters easier to understand.

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The chapter has several objectives: To give a brief history of the Internet; To give the definition of the two often-used terms in the discussion of the Internet: protocol and standard; To categorize standard organizations involved in the Internet and give a brief discussion of each; To define Internet Standards and explain the mechanism through which these standards are developed; to discuss the Internet administration and give a brief description of each branch.

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Chapter summary: Bridges selectively relay packets between network segments, depending on their data-link layer destination addresses; bridges maintain a single broadcast domain and create separate collision domains; switches improve on the function of bridges by forwarding packets only to their destination systems;...and other contents.

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Bài giảng Computer Networks 1 (Mạng Máy Tính 1): Lecture 3.1 của Dr. Phạm Trần Vũ trình bày về The Data Link Layer với những nội dung như Data Link Layer Design Issues, Functions of the Data Link Layer, Services Provided to Network Layer và một số nội dung khác.

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The inner face of the nuclear envelope of metazoan cells is covered by a thin lamina consisting of a one-layered network of intermediate filaments inter-connecting with a complex set of transmembrane proteins and chromatin associating factors. The constituent proteins, the lamins, have recently gained tremendous recognition, because mutations in the lamin A gene,

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Communication Architecture Strategy for connecting host computers and other communicating equipment. Defines necessary elements for data communication between devices. A communication architecture, therefore, defines a standard for the communicating hosts. A programmer formats data in a manner defined by the communication architecture and passes it on to the communication software. Separating communication functions adds flexibility, for example, we do not need to modify the entire host software to include more communication devices....

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Client-Server Application Connection Oracle Net enables a network connection between a client and an Oracle database server. Oracle Net is a software component that resides on both the client and on the Oracle database server. It is layered on top of the network protocol. When a connection is initiated from a client to the Oracle database server, data is passed down a stack on the client, over the network, and up a similar stack to the Oracle database server.

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Security Service – a service provided by a protocol layer of communicating open systems, which ensures adequate security of the systems or of data transfers RFC 2828 – a processing or communication service that is provided by a system to give a specific kind of protection to system resources; security services implement security policies and are implemented bt security mechanisms.

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Raw Sockets let you program at just above the network (IP) layer You could program at the IP level using the IP API but you can’t get at ICMP Raw Sockets expose ICMP you get a Raw Packet and populate the entire packet yourself for high level protocols like TCP and UDP you lose all of the functionality implemented in those layers choosing to use a Raw Socket must be weighed carefully Raw Sockets can be dangerous Raw Sockets can be against the law http://www.kumite.com/rsnbrgr/rob/grcspoof/cnn/ ...

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Upon completing this module, you will be able to: Explain how bridging and switching operates Explain the purpose and operations of the Spanning-Tree Protocol Verify the default configuration of the device, given a functioning access layer switch Build a functional access switch configuration to support the specified network operational parameters, given a network design Execute an add, move, or change on an access layer switch, given a new network requirement

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Upon completing this lesson, you will be able to: Use Telnet to connect to remote network devices, given operational access layer switches and routers Use IOS commands to manage the Telnet sessions, given operational access layer switches and routers

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Upon completing this module, you will be able to: Use the available configuration tools to establish connectivity to the appropriate network device in order to complete the initial device configuration Verify the default configuration of each device, given a functioning access layer switch and router

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Đợc phát triển bởi tổ chức tiêu chuẩn thế giới ISO (International Standard Organization) Gồm có 7 tầng: Tầng vật lý (Physical layer) . Tầng liên kết dữ liệu (Data link layer) Tầng mạng (Network layer) . Tầng vận chuyển (Transport layer) . Tầng giao dịch (Session layer) . Tầng trình bỡy (Presentation) . Tầng ứng dụng (Application layer) .

13p nghiapro512 22-09-2012 133 28   Download

Giải pháp bảo mật mới cho doanh nghiệp vừa và nhỏ .Được thiết kế dựa trên sản phẩm VPN SSL (Secure Sockets Layer) tiên tiến nhất hiện nay là Instant Virtual Extranet (IVE) của Juniper Networks, NetScreen Remote Access 500 được tối ưu hoá riêng cho thị trường doanh nghiệp vừa và nhỏ với ưu thế sản phẩm trọn bộ, giá cả và triển khai dễ dàng. NetScreen Remote Access 500 hoàn thiện dòng sản phẩm NetScreen Secure Access hiện tại của Juniper Networks với các tính năng đưa ra những tuỳ chọn truy cập băng thông rộng từ xa, tăng...

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EURASIP Journal on Applied Signal Processing 2003:12, 1229–1237 c 2003 Hindawi Publishing Corporation Nonlinear System Identification Using Neural Networks Trained with Natural Gradient Descent Mohamed Ibnkahla Electrical and Computer Engineering Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6 Email: mohamed.ibnkahla@ece.queensu.ca Received 13 December 2002 and in revised form 17 May 2003 We use natural gradient (NG) learning neural networks (NNs) for modeling and identifying nonlinear systems with memory.

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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: Cross-Layer Quality-of-Service Analysis and Call Admission Control in the Uplink of CDMA Cellular Networks

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The IMS supports several end-to-end QoS models (described in 3GPP TS 23.207 [13]). Terminals can use link-layer resource reservation protocols (e.g., PDP Context Activation), RSVP, or DiffServ codes directly. Networks can use DiffServ or RSVP. The most common model when cellular terminals are involved is to have terminals use link-layer protocols and to have the GGSN map link-layer resource reservation flows to DiffServ codes in the network. As mentioned in Chapter 8, the PCC (Policy and Charging Control) architecture includes QoS control.

5p 0984272663 27-04-2011 84 10   Download