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CH09-CompSec2e - MCST-CS
CH09-CompSec2e - MCST-CS

... • DMZ is sandwiched between bastion firewalls • DMZ is on a separate network interface on the bastion firewall • used by large businesses and government organizations ...
internet overview lecture slides
internet overview lecture slides

... request goes to a root nameserver to find out where the appropriate top level domain server (.edu) is, then that server is queried as to where the host (buffalo) is, then the host is queried for the address of the actual computer in question (mediastudy) ...
Computer Networks
Computer Networks

... • Determine where one frame/chunk of data starts and ends (be able to distinguish 000 from a transmission line gone dead) ...
Network interface cards (NIC)
Network interface cards (NIC)

... Verify IP Configuration: Linux/Unix ...
networking - Department of Computer Engineering
networking - Department of Computer Engineering

... rather than strange IP address ...
Firewalls - Angelfire
Firewalls - Angelfire

... impossible to block users from visiting web sites deemed off limits, for example. • Logging of network traffic includes only IP addresses and TCP/UDP port numbers, no packet payload information is available, and IP spoofing can penetrate this firewall. • Complex firewall policies are difficult to im ...
Network Architectures - Computing Sciences
Network Architectures - Computing Sciences

... – If placed between Internet and corporate network, can restrict users’ access to Internet resources • Firewalls can attempt to determine the context of a packet (stateful packet inspection (SPI)) ...
4th Edition: Chapter 1 - United States Naval Academy
4th Edition: Chapter 1 - United States Naval Academy

...  hooks that allow sending and receiving app programs to “connect” to Internet  provides service options, analogous to postal service institutional network Introduction 1-6 ...
Computer-Networks-and-Internets-5th-Edition-Comer-Solution
Computer-Networks-and-Internets-5th-Edition-Comer-Solution

... hardware and software technologies that are used to transfer data from one application to another. However, knowledge of the underlying network system allows a programmer to write better code. 1.4 To what aspects of networking does data communications refer? Answer: Data communications refers to the ...
Document
Document

... —Most heavily used network application in corporate world —Attach documents multimedia to mail messages —Electronic mailing list • Alias with multiple destinations ...
Slide 1
Slide 1

... • Network software follows different procedures to have the web-page displayed to you • These procedures are called protocols • Variety of protocols are running on your computer • Each responsible to perform a different task ...
Network - McGraw Hill Higher Education
Network - McGraw Hill Higher Education

... – Client/Server Network—Model for applications in which the bulk of the back-end processing takes place on a server, while the front-end processing is handled by the clients B5-5 ...
Intro to internet/WWW
Intro to internet/WWW

... • Each document/resource on the WWW needs to have an identifier in order to be accessed by others. • A Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. • A Uniform Resource Locator (URL) is a URI which provides means of obtaining the resource ...
Technologies that make the Internet Robust
Technologies that make the Internet Robust

... – the cable and phone companies would sure like to! – a large fraction of Internet traffic is Netflix + Youtube + Skype • the exact amount is under debate • http://www.forbes.com/sites/bruceupbin/2011/05/18/netflix-is-not30-of-internet-traffic/ • it is mitigated by intelligently staging content on s ...
Hands-On Ethical Hacking and Network Security
Hands-On Ethical Hacking and Network Security

... packets from that server may be allowed in – Packets from the same server might be blocked if no request was sent first ...
Trojan Horse
Trojan Horse

... * Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms. ...
Receiving data
Receiving data

... If it is not the same as the machine/NIC address → discard the frame ...
Windows XP Professional
Windows XP Professional

... Controls traffic between networks – Level 3 Controls traffic between network segments – Level 2 or 3 ...
Firewalls
Firewalls

... TCP Ack for Port Scanning • Attacker sends packet with ACK set (without prior ...
ITEC350 Networks I
ITEC350 Networks I

... Connection-Oriented and Connectionless Services The software used to maintain each protocol is often called a protocol stack Transport layer protocols can be:  Connectionless, or stateless, which sends each packet without regard to whether any other packet was received by the destination compute ...
PPT - University of Pittsburgh
PPT - University of Pittsburgh

... • Each document/resource on the WWW needs to have an identifier in order to be accessed by others. • A Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. • A Uniform Resource Locator (URL) is a URI which provides means of obtaining the resource ...
Network - UniMAP Portal
Network - UniMAP Portal

... • Internet evolved from ARPANET – first operational packet network – applied to tactical radio & satellite nets also – had a need for interoperability – lead to standardized TCP/IP protocols ...
Introduction - start [kondor.etf.rs]
Introduction - start [kondor.etf.rs]

... Circuit and packet switches connect multiple inputs to multiple outputs. In circuit switches, the configuration pattern changes on a slow time scale. In packet switches, the configuration changes on a packet-per-packet basis. ...
FIRE: Flexible Intra-AS Routing Environment
FIRE: Flexible Intra-AS Routing Environment

... IP/IPsec Encapsulation, etc. IP Fragmentation ICMP errors/requests ...
A performance analysis modeling of a QoS
A performance analysis modeling of a QoS

... chosen because they can be easily programmed. It is viewed as a queueing network of a home gateway with one node. Such a simple queueing model like the M/M/1/K with First Come First Served (FCFS) service discipline can predict a home gateway performance quite well. But, it is difficult to assume tha ...
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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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