Vulnerability scanning: It is an inspection of the potential points of exploit on a computer or network to identify security holes. A vulnerability scan detects and classifies system weaknesses in computers, networks and communications equipment and predicts the effectiveness of countermeasures.
Port Scanning: 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.
Patch Management: Patch management is an area of systems management that involves acquiring, testing, and installing multiple patches (code changes) to an administered computer system. Patch management tasks include maintaining current knowledge of available patches, deciding what patches are appropriate for particular systems, ensuring that patches are installed properly, testing systems after installation, and documenting all associated procedures, such as specific configurations required.
Some important points to remember
A patch is an important component of software update and it usually fixes some known bugs. If you need to apply it on a server, where the downtime is critical, it is recommended practice to install the patch on a lab server first. Install it on the production server once you find it satisfactory.
High Speed Packet Access (HSPA+) is known as a 3G transitional technology that supports legacy architecture.
EDGE, an acronym for enhanced data rates for GSM evolution, is a technology that is backward compliant and provides faster data rates (3G) on the GSM standard. Networks built for Edge are used to deliver streaming data at speeds up to 384Kbps (slow by most standards but faster than GSM).
Long Term Evolution, LTE is a 4G wireless communications standard developed by the 3rd Generation Partnership Project (3GPP) that's designed to provide up to 10x the speeds of 3G networks for mobile devices such as smartphones, tablets, netbooks, notebooks and wireless hotspots.
WiMax is a standardized wireless version of Ethernet intended primarily as an alternative to wire technologies (such as Cable Modems, DSL and T1/E1 links) to provide broadband access to customer premises.
HSPA+(Evolved High-Speed Packet Access ) is an enhanced version of high-speed 3G wireless networks.
With ADSL, downloads are faster than uploads, which is why it is called asymmetric DSL.
The most common of the DSL varieties is ADSL, which uses different channels on the line. One channel is used for POTS and is responsible for analog traffic. The second channel provides upload access, and the third channel is used for downloads.
The term asymmetric in asymmetric DSL implies the upstream and downstream speeds can be different. Typically, downstream speeds are greater than upstream speeds in an ADSL connection.
The theoretical maximum downstream speed for an ADSL connection is 8 Mbps, and the maximum upstream speed is 1.544 Mbps (the speed of a T1 circuit).
Asymmetric Digital Subscriber Line(ADSL) is an asymmetric service, which means the download speeds are faster than the upload speeds.
vSymmetric Digital Subscriber Line(SDSL) is a symmetric service, in which the upload data throughput from your computer to the internet is the same as your download speed.
Very High Bit-Rate DSL (VDSL) boasts a much higher bandwidth capacity than ADSL or SDSL, with a common downstream limit of 52 Mbps and a limit of 12 Mbps for upstream traffic.
Bandwidth/Throughput: Bandwidth is the maximum amount of data that can travel through a 'channel'. Throughput is how much data actually does travel through the 'channel' successfully. This can be limited by a ton of different things including latency, and what protocol you are using.