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Computer Networks BITS ZC481
Computer Networks BITS ZC481

... peer by passing messages to some lower level protocol, which in turn delivers the message to its peer. ...
Telecommunications and Networking - University of Baltimore Home
Telecommunications and Networking - University of Baltimore Home

... An Intranet Also look at fig 6.8  A network inside an organization – That uses Internet technologies (such as Web browsers and servers, TCP/IP protocols, HTML, etc.) – To provide an Internet-like environment within the organization – For information sharing, communications, collaboration and suppo ...
- LearnGroup
- LearnGroup

... Internet internet an interconnected set of networks where each of the constituent networks retains its identity ...
Chapter One - Indiana University
Chapter One - Indiana University

... – Created by DARPA originally in early 70’s – Based on Transmission Control Protocol/ Internet Protocol (TCP/IP) suite – Combines the “top” three layers of the OSI model into a single layer. ...
Virtual Private Network
Virtual Private Network

... connect remote sites or users together. Instead of using a dedicated connection such as leased line, a VPN uses “virtual” connections routed though the internet. ...
Voice Over IP
Voice Over IP

... Introduction VoIP Transmission of voice traffic in packets Internet as the transmission medium ...
FFPF: Fairly Fast Packet Filters
FFPF: Fairly Fast Packet Filters

...  monitoring increasingly important  hypothesis: multiple applications on single host ...
Network Components Presentation
Network Components Presentation

... Use network addresses and addresses of other routers to create a route between two networks so must keep tables of addresses.  These tables are copied between routers using routing information protocol (RIP).  Often used to connects LANs & WANs e.g. connect a LAN to the internet using one IP addre ...
PowerPoint
PowerPoint

... • Physical components can work however they want, as long as the interface between them is consistent. • Then, different hardware can be connected. ...
File
File

...  It is examines all the traffic between two networks.  it is routed between the networks, otherwise it is stopped.  It checks the protocol which the packet being delivered and also check port number to which it is being sent.  The main function of firewall is to provide centralized access contro ...
Common Hardware Requirements for Computer Networking
Common Hardware Requirements for Computer Networking

... TCP/IP protocol suite that is used in place of TCP when a reliable delivery is not required. • For example, UDP is used for realtime audio and video traffic where lost packets are simply ignored, because there is no time to retransmit. • If UDP is used and a reliable delivery is required, packet seq ...
Backbone: the main connecting cable that runs from one end of the
Backbone: the main connecting cable that runs from one end of the

... protocol- is a convention or standard that controls or enables the connection, communication, and data transfer between two computing endpoints. In its simplest form, a protocol can be defined as the rules governing the syntax, semantics, and synchronization of communication. Protocols may be implem ...
Valiant Load-Balancing in Backbone Networks
Valiant Load-Balancing in Backbone Networks

... Each flow is evenly split over N paths Routing decisions are local ...
02-design
02-design

... • Yes, but only to improve performance • If network is highly unreliable • Adding some level of reliability helps performance, not correctness • Don’t try to achieve perfect reliability! • Implementing a functionality at a lower level should have minimum performance impact on the applications that d ...
Network
Network

... -- Network Layer (a.k.a. Internet) (IP) -- (Data) Link Layer / MAC sub-layer ...
In preparation of Workprogramme 2000 IST: overview of status
In preparation of Workprogramme 2000 IST: overview of status

... > European EVN and LOFAR will built around optical lightpaths on GEANT network > In Canada eVLBI is mostly used for Geodetic applications ...
internet connection through isp
internet connection through isp

...  An IP packet has a header at the beginning which contains the source and destination IP addresses. It also contains control information that describes the packet to network devices, such as routers, it passes through and also helps to control its behavior on the network. The IP packet is sometime ...
Slides for Chapter 3: Networking and Internetworking
Slides for Chapter 3: Networking and Internetworking

... Protocols at this level transmit data in a network representation that is independent of the representations used in individual computers, which may differ. Encryption is also performed in this layer, if required. At this level reliability and adaptation are performed, such as detection of failures ...
firstclass
firstclass

... servers, now directly network connected  Originally dumb, now intelligent enough to do some real damage ...
The Internet
The Internet

... • Individual flows are not identified and instead the individual flows in each services class are aggregated together • Diffserv network the type of service field in the IP packet header is replaced by a new field call DS field • DSCP:used to enable each router to determined the traffic class to whi ...
PPT - 清華大學資訊工程學系
PPT - 清華大學資訊工程學系

... each other across a network. – Example 1:先在資電館前集合,再出發到餐廳 – Example 2: bus route and schedule – Example 3: traffic regulations ...
Application Control
Application Control

... Analyses the payload and the header information of an IP packet to detect different kind of intrusion attempts • Monitors inbound traffic • Inspects single packets only, not full stream or TCP/IP sequence • System alerts on 31 malicous packets; most common operating system fingerprinting attempts (n ...
Part I: Introduction
Part I: Introduction

... Institutional access: local area networks  company/univ local area ...
chapter1a
chapter1a

... Institutional access: local area networks  company/univ local area ...
Module 1: Introduction to TCP/IP
Module 1: Introduction to TCP/IP

... Hybrid hub Main Hub ...
< 1 ... 434 435 436 437 438 439 440 441 442 ... 474 >

Deep packet inspection

Deep Packet Inspection (DPI, also called complete packet inspection and Information eXtraction or IX) is a form of computer network packet filtering that examines the data part (and possibly also the header) of a packet as it passes an inspection point, searching for protocol non-compliance, viruses, spam, intrusions, or defined criteria to decide whether the packet may pass or if it needs to be routed to a different destination, or, for the purpose of collecting statistical information. There are multiple headers for IP packets; network equipment only needs to use the first of these (the IP header) for normal operation, but use of the second header (TCP, UDP etc.) is normally considered to be shallow packet inspection (usually called Stateful Packet Inspection) despite this definition.There are multiple ways to acquire packets for deep packet inspection. Using port mirroring (sometimes called Span Port) is a very common way, as well as an optical splitter.Deep Packet Inspection (and filtering) enables advanced network management, user service, and security functions as well as internet data mining, eavesdropping, and internet censorship. Although DPI technology has been used for Internet management for many years, some advocates of net neutrality fear that the technology may be used anticompetitively or to reduce the openness of the Internet.DPI is used in a wide range of applications, at the so-called ""enterprise"" level (corporations and larger institutions), in telecommunications service providers, and in governments.
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