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slides - The Fengs
slides - The Fengs

... – Program that promiscuously monitors and injects network traffic to/from machines it is protecting – Monitors net for SYN packets not acknowledged after a certain period of time – If it detects problems with a half-open connection it can • Send RST packets to the sender to release destination resou ...
IV. Proposed System
IV. Proposed System

... Since the last decade the uses of the internet has spectacular impact over the society around the world, which also give a new opportunity to intruder to attack on the network which result in a jeopardize on one privacy and many others. In context develop a system which provide security on network. ...
Network Simulator Tutorial
Network Simulator Tutorial

... events: points in time when system changes state ...
SSL and IPSec
SSL and IPSec

... • Encapsulate IP packet (IP header and IP data) • Use IP to send IPsec-wrapped packet • Note: IP header protected ...
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)

... advantage of Wi-Fi based navigation system function is that it can effectively locate a vehicle which is inside big campuses like universities, airports, and tunnels. Communication capabilities in vehicles are the basis of an envisioned Intelligent Vehicular Ad-Hoc Network (InVANET) or Intelligent T ...
01101014
01101014

... growth was ten times higher than that of the previous year. Afterwards, a few new ISPs started their venture recording a proportionate growth in number of users. As of now the total number of ISPs in the country is approximately seventy and there are approximately 300 thousand users connected to the ...
paper
paper

... wireless networks with multihome clients provide worldwide internet access by combining various wireless technologies [3]. Mobile devices with multiple wireless interfaces such as cellular and Wi-Fi are widely available in the markets. Therefore, when such a user equipment having access to such mult ...
Basic Networking Tutorial
Basic Networking Tutorial

... in a network, people can share files and peripherals such as modems, printers, tape backup drives, or CD-ROM drives. When networks at multiple locations are connected using services available from phone companies, people can send e-mail, share links to the global Internet, or conduct video conferenc ...
On Monitoring of End-to-End Packet Reordering over the Internet  Bin Ye
On Monitoring of End-to-End Packet Reordering over the Internet Bin Ye

... Load balancing policies within networks introduce switch-level parallelism. Route flapping, where routes between autonomous systems (AS) change frequently, also causes different packets of the same stream to take different paths possibly leading to out-of-order delivery. In wireless communication, t ...
PDF
PDF

... identity of the endpoints. The protocol also embodies cryptographic commitments, join certificates, and disruption proofs to identify and exclude misbehaving hosts. The overall goals of CliqueNet, and the techniques used to achieve them, are: • Strong Anonymity: The system should provide strong, tha ...
OSI Defense in Depth to Increase Application Security
OSI Defense in Depth to Increase Application Security

... protection methods are the responsibility of the programmer at this layer. Backdoor attacks occur at this level and it is the programmer’s responsibility to close those doors. IT managers can use access control methods described to assist in preventing backdoor attacks; also, IT managers can set up ...
Lecture3
Lecture3

... cryptographic checksum or hash of message • Authentication also provided if hash covers: – Shared secret key, sender’s identity & message – Fields that are changed while packet traverses Internet are set to zero in calculation of hash ...
CEN 4500C Computer Networks Fundamentals
CEN 4500C Computer Networks Fundamentals

... R4. Describe why an application developer might choose to run an application over UDP rather than TCP. Give examples of such applications. (4 points) An application developer may not want its application to use TCP’s congestion control, which can throttle the application’s sending rate at times of c ...
University of Tehran
University of Tehran

... Interlan switches, bridge are powerful but not scalable to WAN. Problem with Layer 2 switching is that it takes network as a flat network. ...
Broadcast Routing - UCLA Computer Science
Broadcast Routing - UCLA Computer Science

...  whoever gets the token can send one data frame, then passes token to next node  A master station generates the token and monitors its ...
Soft Computing Techniques for Mishaps Prediction
Soft Computing Techniques for Mishaps Prediction

... condition and climate condition that were causally connected with different injury harshness [11, 12, 13 and 14]. This can help decision makers to improve traffic safety control policies. This paper proposed the using of soft computing techniques like MLP neural networks and hybrid techniques to bui ...
IST Notes - The Bored of Studies Community
IST Notes - The Bored of Studies Community

... o Sharing applications: Networks enable users to share applications. Usually a network licence is cheaper and can be installed faster. o Sharing data: Networks provide a very fast method for sharing and transferring files. Many networks have a file server to store data which can be accessed from any ...
UNIX Networking
UNIX Networking

... • Server is a process that is waiting to be contacted by a client process so that server can do something for the client. – Server is started, sleeps waiting for a service request from a client – Client processes started on same system or another system within a network. – Client process sends a req ...
Networking and the Internet
Networking and the Internet

... • Before sending data, a node listens to the channel for a period. – If the channel is silent, it sends data. – If the channel is busy, it waits another random period. After waiting, if the channel is silent, it ...
投影片 1
投影片 1

... • The biggest problem when the deadline is closer and closer… – Learning curve is not linear. • Easy to build scenarios, but hard to modify/add protocols. – Poor documentation. (compare to OPNET) – Does not Support Chinese? ...
Outline CSE 713: Wireless Networks Security – Principles and Practices p
Outline CSE 713: Wireless Networks Security – Principles and Practices p

...  Created especially for use in 802.11i RSN  Builds on top of counter mode  Uses CBC (Cipher Block Chaining) in conjunction with Counter mode to produce a MIC (Message Integrity Code) for authentication purposes  CBC-MAC operates as follows  Take the first block and encrypt it using AES  XOR re ...
for TCP
for TCP

... – Consequence: Sender must buffer all TPDUs sent – May need to retransmit • Receiver needs to buffer – Out of order TPDUs – Flow control to application(s) (maximize tranmission speed) • Sender TP layer also buffers to even flow from its application(s) (smooth out bursts to match network) • Buffering ...
ppt
ppt

... • 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 ...
chap03
chap03

... • It defines the message format and the message transfer agent (MTA), which stores and forwards the mail to SMTP, POP3, and IMAP4 servers • Supports MIME (multipurpose Internet mail extensions) and other encoding methods to enable program and multimedia files to be attached to e-mail messages E-Busi ...
PPT
PPT

... Current version OpenFlow limitations  Non-flow-based(per-packet) networking  Use all tables on switch chips  New forwarding primitives  New packet formats/field definitions  Low-setup time individual flows  But can push flows proactively ...
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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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