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firewalls
firewalls

... Figure 9.10: Asymmetric routes with two dynamic packet filters. Distance on the drawing is intended to be proportional to distance according to the routing protocol metrics. The solid lines show actual routes; the dotted lines show rejected routes, based on these metrics. ...
CSCI6268L18 - Computer Science
CSCI6268L18 - Computer Science

... • IP is “best effort” – There is no tracking of packets – If something is dropped… oh well – If one fragment is dropped, many transport layer protocols (like TCP) will consider the whole thing lost and not ACK – This seems bad, but it’s one of the biggest successes of IP – UDP is IP with ports, so i ...
Networking - Institute of Mathematics and Informatics
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... • Computer communications – Exchange of information between computers for the purpose of cooperative action ...
Network Measurement
Network Measurement

... 90% of bulk data transfers send less than 10 kilobytes of data  Example: 50% of interactive connections last less than 90 seconds  Distributions may be ‘‘heavy tailed’’ (i.e., extreme values may skew the mean and/or the distribution) ...
網路犯罪案例 Cyber crime Case
網路犯罪案例 Cyber crime Case

... website for free web space to falsely post or sticker advertising published in the Office of credit and information. This was done to attract the much-needed cash flow of the head customer. The members of the Group forged tax, payroll and other documents to falsely strengthen the lender's financial ...
Packet Sniffers
Packet Sniffers

... Router A ...
61765 Computer Networks I
61765 Computer Networks I

... Credits: 3.5; 3 lecture hours, 1 lab hour (2 hours every two weeks) Prerequisites: 61753 Algorithms in Graph Theory or 61713 Course Description This is an introductory course in computer networks and data communication methods. The TCP/IP layers are presented using a top-down approach, from the appl ...
Chapter 3 slides
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... together by circuits. ◦ Broadcast: Everything is transmitted to every node. ◦ Circuit switching: local exchange was connected by an automatic switch at the exchange to the pair of wires connected to the other party’s. (Phone) ◦ Packet switching: brought processing and storage. construct a different ...
lecture02
lecture02

... packets, can be potentially lost, can be potentially delivered out-of-order • What you may want: application-to-application (end-to-end) channel, communication stream, reliable, in-order delivery ...
Scout: A Communication-Oriented Operating System
Scout: A Communication-Oriented Operating System

... – Flexibility, deployability, and evolvability are achieved only when the truly universal portions of the architecture are truly minimal. – Not all questions can be answered quantitatively; attention must also be paid to how interest groups affect protocol design, so called tussles in cyberspace. ...
Software Defined Networks - Informatica
Software Defined Networks - Informatica

... !  Network virtualization !  Using multiple wireless access points !  Energy-efficient networking !  Adaptive traffic monitoring !  Denial-of-Service attack detection ...
CSCI6268L10 - Computer Science
CSCI6268L10 - Computer Science

... • IP is “best effort” – There is no tracking of packets – If something is dropped… oh well – If one fragment is dropped, many transport layer protocols (like TCP) will consider the whole thing lost and not ACK – This seems bad, but it’s one of the biggest successes of IP – UDP is IP with ports, so i ...
CSCI6268L10 - Computer Science
CSCI6268L10 - Computer Science

... • IP is “best effort” – There is no tracking of packets – If something is dropped… oh well – If one fragment is dropped, many transport layer protocols (like TCP) will consider the whole thing lost and not ACK – This seems bad, but it’s one of the biggest successes of IP – UDP is IP with ports, so i ...
January 25, 2012 - Indiana University Bloomington
January 25, 2012 - Indiana University Bloomington

... Baran was concerned about creating a network that could survive a nuclear attack. Davies was looking for a more efficient network that would work with time-sharing systems. Davies came up with the name; both given credit for the ...
Y490 Politics of High Technology
Y490 Politics of High Technology

... Baran was concerned about creating a network that could survive a nuclear attack. Davies was looking for a more efficient network that would work with time-sharing systems. Davies came up with the name; both given credit for the ...
Programming the IBM Power3 SP
Programming the IBM Power3 SP

... INCITE: Edge-based Traffic Processing and Service Inference for High-Performance Networks Richard Baraniuk, Rice University; Les Cottrell, SLAC; Wu-chun Feng, LANL ...
CSCI 360 Intro To Computer Networks INFS 361 Network
CSCI 360 Intro To Computer Networks INFS 361 Network

... Client server - sockets - DNS – E-Mail (whole weeks) – HTTP (Web), FTP, ...
Ethernet, IP and TCP
Ethernet, IP and TCP

... • 2 power 48 addresses, that is about 11000 addresses for every inhabitant of the ...
9. telecommunications
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... ISP’s (Internet Service Providers) – Local and regional delivery ...
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Basic Networking Terminology

... 14. a physical location that offers Internet access over a wireless local area network 16. a computer network that interconnects computers within a limited area such as a home, school, or office. 17. allows computers to automatically request and be assigned IP addresses and other network settings ...
set 2 - of Manish Mehta
set 2 - of Manish Mehta

... • Why you call it ‘network-based’? - used to analyze network packets. - packets are ‘sniffed’ off the network. • TCP/IP is the most common protocol targeted by commercial IDS. • Different technologies can resolve different levels of protocols through the application layer. ...
NetworkSecurity
NetworkSecurity

... done because there is limited room for message transmission along the Internet. Keeping the messages to a standardized parcel size of fewer than 1500 characters ensures that traffic will continue to move smoothly. ...
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The Infrastructure Technologies

... A network consists of two or more computers linked by communication lines. ...
Windows Firewall
Windows Firewall

... readdressed, information about protected network is hidden Cons No application Level Security ...
05 LAES presentation
05 LAES presentation

... Communications Assistance for Law Enforcement Act (1994)  Standardized ...
< 1 ... 463 464 465 466 467 468 469 470 471 ... 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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