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Что (кто) такое packet filter - определение
FIREWALL PROGRAM FOR BSD SYSTEMS
PacketFilter; Packet Filter; Pf (firewall); Pf firewall; /dev/pf
Найдено результатов: 674
Firewall (computing)
![Flow of [[network packet]]s through [[Netfilter]], a [[Linux kernel]] module](https://commons.wikimedia.org/wiki/Special:FilePath/Netfilter-packet-flow.svg?width=200 "Flow of [[network packet]]s through [[Netfilter]], a [[Linux kernel]] module")
NETWORK SECURITY SYSTEM THAT MONITORS AND CONTROLS INCOMING AND OUTGOING NETWORK TRAFFIC BASED ON PREDETERMINED SECURITY RULES
Network layer firewall; Packet filter; Packet filtering; Firewall (networking); Firewall (computer); Network firewall; Host-based firewall; Deep packet filtering; Firewall software; Computer firewall
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.
data packet
FORMATTED UNIT OF DATA CARRIED BY ALL PACKET-SWITCHING NETWORKS
Data packet; Data packets; Packet (information technology); Packet technology; Packet (computing); Packet (network); Packet data
Network packet
FORMATTED UNIT OF DATA CARRIED BY ALL PACKET-SWITCHING NETWORKS
Data packet; Data packets; Packet (information technology); Packet technology; Packet (computing); Packet (network); Packet data
In telecommunications and computer networking, a network packet is a formatted unit of data carried by a packet-switched network. A packet consists of control information and user data; the latter is also known as the payload.
Photographic filter
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER
Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.
Elliptic filter
.svg?width=200 "The frequency response of a fourth-order elliptic low-pass filter with '''ε''' = 0.5 and '''ξ''' = 1.05. Also shown are the minimum gain in the passband and the maximum gain in the stopband, and the transition region between normalized frequency 1 and '''ξ'''")
.svg?width=200 "A closeup of the transition region of the above plot.")
![Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.](https://commons.wikimedia.org/wiki/Special:FilePath/Elliptic Filter s-Plane Response (8th Order).svg?width=200 "Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.")
.svg?width=200 "An expanded view in the transition region of the above image, resolving the four poles and two double zeroes.")
SIGNAL PROCESSING FILTER
Cauer filter; Elliptical filter; Equiripple filter; Eliptic filter
An elliptic filter (also known as a Cauer filter, named after Wilhelm Cauer, or as a Zolotarev filter, after Yegor Zolotarev) is a signal processing filter with equalized ripple (equiripple) behavior in both the passband and the stopband. The amount of ripple in each band is independently adjustable, and no other filter of equal order can have a faster transition in gain between the passband and the stopband, for the given values of ripple (whether the ripple is equalized or not).
Electronic filter
![A low-pass electronic filter realised by an [[RC circuit]]](https://commons.wikimedia.org/wiki/Special:FilePath/1st Order Lowpass Filter RC.svg?width=200 "A low-pass electronic filter realised by an [[RC circuit]]")
ELECTRONIC CIRCUIT THAT REMOVES UNWANTED COMPONENTS FROM THE SIGNAL, OR ENHANCES WANTED ONES, OR BOTH
Electronic filters; Filter (circuits); Pi filter; Pi Filter; Frequency filter; BAW filter
Electronic filters are a type of signal processing filter in the form of electrical circuits. This article covers those filters consisting of lumped electronic components, as opposed to distributed-element filters.
packet switching
![NCSA]] using traffic data provided by the [[Merit Network]].](https://commons.wikimedia.org/wiki/Special:FilePath/NSFNET-traffic-visualization-1991.jpg?width=200 "NCSA]] using traffic data provided by the [[Merit Network]].")
![An animation demonstrating [[datagram]] type of packet switching across a network](https://commons.wikimedia.org/wiki/Special:FilePath/Packet Switching.gif?width=200 "An animation demonstrating [[datagram]] type of packet switching across a network")
METHOD FOR TRANSMITTING DATA OVER A COMPUTER NETWORK
Packet switched; Packet-switching; Packet-switched; Packet Switching; Datapackets; Packet-switched network; Packet-switched radio; Packet-switched data network; Private data network; International packet network; Packet network; Transpac (network); Packet-oriented; Packet based; Packet switch; Packet Switch; Packet switched network; Packet manager; SCANNET; RCP (Packet switching); Octopus (network); OCTOPUS (network); Octopus network; Datex-P; Packet mode communication; European Informatics Network; Packet-switched computer network
also packet-switching
Packet-switching is a method of sending computer data on telephone lines which automatically divides the data into short pieces in order to send it and puts it together again when it is received. (COMPUTING)
N-UNCOUNT
packet-switching
METHOD FOR TRANSMITTING DATA OVER A COMPUTER NETWORK
Packet switched; Packet-switching; Packet-switched; Packet Switching; Datapackets; Packet-switched network; Packet-switched radio; Packet-switched data network; Private data network; International packet network; Packet network; Transpac (network); Packet-oriented; Packet based; Packet switch; Packet Switch; Packet switched network; Packet manager; SCANNET; RCP (Packet switching); Octopus (network); OCTOPUS (network); Octopus network; Datex-P; Packet mode communication; European Informatics Network; Packet-switched computer network
see packet switching
Packet switching
METHOD FOR TRANSMITTING DATA OVER A COMPUTER NETWORK
Packet switched; Packet-switching; Packet-switched; Packet Switching; Datapackets; Packet-switched network; Packet-switched radio; Packet-switched data network; Private data network; International packet network; Packet network; Transpac (network); Packet-oriented; Packet based; Packet switch; Packet Switch; Packet switched network; Packet manager; SCANNET; RCP (Packet switching); Octopus (network); OCTOPUS (network); Octopus network; Datex-P; Packet mode communication; European Informatics Network; Packet-switched computer network
In telecommunications, packet switching is a method of grouping data into packets that are transmitted over a digital network. Packets are made of a header and a payload.
Optical filter
![Coloured and [[neutral-density filter]]s](https://commons.wikimedia.org/wiki/Special:FilePath/Filter-optics-1.jpg?width=200 "Coloured and [[neutral-density filter]]s")
DEVICE THAT SELECTIVELY TRANSMITS LIGHT OF CERTAIN WAVELENGTHS
Optic filter; Wedge filter; Glass filter; Optical Filters; Optical band-pass filter; Optical bandpass filter; Filter (optics); Light filter
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, which specifies how the magnitude and phase of each frequency component of an incoming signal is modified by the filter.
Википедия
PF (firewall)
PF (Packet Filter, also written pf) is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to netfilter (iptables), ipfw, and ipfilter.
PF was developed for OpenBSD, but has been ported to many other operating systems.
