Collision Domain

Collision Domain

A computer network can be segmented physically and logically. A collision domain is one of the logical network segments in which the data packets can collide with each other. One of the most common protocols used when referring to a collision domain is the Ethernet protocol. Collision domains are often referred to as 'Ethernet segments.' The term 'collision domain' is also used when describing the circumstances in which a single network device sends packets throughout a network segment and fo

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Single Mode Fiber

Single Mode Fiber

A single mode fiber is a fiber optical cable that uses only one ray of light known as a “mode”. A single mode fiber can be used to transfer data in either direction at incredibly fast speeds and may stretch along hundreds or even thousands of kilometers. These factors allow single mode fibers to provide large office buildings, warehouses, and other areas with large numbers of computers to maintain fast speeds and reliable connections on all computers connected to the network.  

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WAP (Wireless Application Protocol)

WAP (Wireless Application Protocol)

Wireless Application Protocol (WAP) is a technical standard for accessing information over a mobile wireless network. A WAP browser is a web browser for mobile devices that use the protocol. Before the introduction of WAP, mobile service providers had limited opportunities to offer interactive data services, but required interactivity to support Internet and applications such as: Email by mobile phone Tracking of stock-market prices Sports results News headlines Music downloads

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What Port Number is XXX on?

What Port Number is XXX on?

The way that most services work under TCP/IP is that the server is configured to use a well known port number and the client connects from a random high port. Most of these well known ports are port numbers below 1,024. High ports are ports 1,024 or above. In the old days, ports below 1,024 were known as trusted ports. On Unix machines, only a user or process with root privileges is able to open an outgoing port below 1,024. With the proliferation of Windows and single-user Unix systems, the

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WiFi Signal Strength Meter

WiFi Signal Strength Meter

Windows and other operating systems have a WiFi signal strength meter, but this is usually basic software and does not really tell the user much about the wireless signal. Fortunately, there are many other programs that do the same thing, but show the user more details about the wireless connection. We will describe some of these programs. Net Stumbler Net Stumbler does several things. It is a wireless signal strength meter that gives detailed reports to the user about the wireless network.

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Multi Mode Fiber

Multi Mode Fiber

Multi-mode fiber is a type of fiber optic cable which is thick enough for light to follow several paths through the code. Multi-mode fiber is best suited for use in short lengths, such as those used in Local Area Networks (LANs) and Storage Area Networks (SANs). Multi-mode fiber comes in two standard widths, 62.5 micron and 50 micron. A micron is one millionth of a meter. 62.5 micron multi-mode fiber can support Gigabit Ethernet over distances as long as 275 meters; 50 micron multi-mode fiber

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PPP (Point-to-Point Protocol)

PPP (Point-to-Point Protocol)

PPP (Point-to-Point Protocol) is the most widely used method for transporting IP packets over a serial link between the user and the Internet Service Provider (ISP). Although PPP is primarily used over dialup lines, variants such as PPoE (PPP over Ethernet) and PPoA (PPP over ATM) extend PPP to new data-link layer protocols. PPP was designed to enable the transmission of different protocols over one point-to-point link by utilizing encapsulation. Encapsulation is the process of storing packet

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How to Block an IP Address

How to Block an IP Address

An IP address is the numeric label or sequence of numbers that is assigned to a computer or device used on the Internet or a local area network. It is a means of identification and determining the user's address online. When an IP address is blocked, network connections to or from that address are not permitted. An IP address can only be blocked through a firewall that is installed on the computer. Windows users have two options for blocking an IP address: 1) Through the built-in Windows fi

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Cisco VPN Error 412

Cisco VPN Error 412

The CISCO VPN Client is a popular software application that allows end-users to connect a computer to a VPN (virtual private network). Once connected, the client computer can leverage the resources of the remote network in a secure environment as if connected directly to the local network. Unfortunately, a common error that can arise for users of the Cisco software application is the Cisco VPN Error 412. When thrown, the causes of the error will have to be corrected in order to regain full funct

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MTRJ Connectors

MTRJ Connectors

An MTRJ connector is a type of fiber optic cable that has an endpoint similar to the RJ-45 connector endpoint found in Ethernet connections. MTRJ connectors are designed to snap into the Ethernet port of a computer, modem, or wireless router and provide that computer or network with extremely fast data transfer rates. MTRJ connectors are usually designed for multi-mode optical fibers but can be used for single mode optical fibers as well. MTRJ connectors are approximately 2.45 mm x 4.4 mm in siz

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