The act of systematically scanning a computer’s ports. Since a port is a place where information goes into and out of a computer, port scanning identifies open doors to a computer. Port scanning has legitimate uses in managing networks, but port scanning also can be malicious in nature if someone is looking for a weakened access point to break into your computer.
Types of port scans:
vanilla: the scanner attempts to connect to all 65,535 ports
strobe: a more focused scan looking only for known services to exploit
fragmented packets: the scanner sends packet fragments that get through simple packet filters in a firewall
UDP: the scanner looks for open UDP ports
sweep: the scanner connects to the same port on more than one machine
FTP bounce: the scanner goes through an FTP serverin order to disguise the source of the scan
stealth scan: the scanner blocks the scanned computer from recording the port scan activities.
Port scanning in and of itself is not a crime. There is no way to stop someone from port scanning your computer while you are on the Internet because accessing an Internet server opens a port, which opens a door to your computer. There are, however, software products that can stop a port scanner from doing any damage to your system.
- port triggering
A type of port forwarding where outbound traffic on predetermined ports sends inbound traffic to specific incoming ports. Port triggering “triggers” an open incoming port when a client on the local network makes an outgoing connection to a predetermined port on a server. Port Triggering is more secure than port forwarding, because the incoming ports […]
(adj.) (1) When used to describe hardware, portable means small and lightweight. A portable computer is a computer small enough to carry. Portable computers include notebook and subnotebook computers, hand-held computers, palmtops, and PDAs . (2) When used to describe software, portable means that the software has the ability to run on a variety of […]
- portable image storage device
A small, portable storage device used for storing and viewing your digital images. The device is a portable hard drive in an enclosure that resembles handheld game consoles. The device usually offers USB and memory card readers as options for transferring your images directly to the device, as well as an LCD display for viewing […]
(1) A Web portal or public portal refers to a Web site or service that offers a broad array of resources and services, such as e-mail, forums, search engines, and online shopping malls. The first Web portals were online services, such as AOL, that provided access to the Web, but by now most of the […]
- portable mesh repeater
A stand alone battery, charger and equipment pack used in field deployment situations for instant deployment to communications equipment. Portable mesh repeaters work as a router/repeater to extend mesh networks for connecting laptops, PDAs, video cameras and other portable devices to 802.11g or 802.11b networks. Also called a portable mesh repeater/router.