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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CSMA/CD

CSMA/CD

CSMA/CD (Carrier Sense Multiple Access / Collision Detection) is the protocol used in Ethernet networks to ensure that only one network node is transmitting on the network wire at any one time. Carrier Sense means that every Ethernet device listens to the Ethernet wire before it attempts to transmit. If the Ethernet device senses that another device is transmitting, it will wait to transmit. Multiple Access means that more than one Ethernet device can be sensing (listening and waiting to t

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How to Send Text Messages Free

How to Send Text Messages Free

Cell phone text messages typically use the SMS (Short Message Service) protocol. Most cellular service providers charge fees to send and receive text messages. There are numerous ways to send text messages for free, but they vary among cell service providers. Send Free Text Messages by Purchasing the Right Service Plan Some cell service plans include free text messaging. That is the simplest solution. Send Text Messages for Free via the Web Many websites allow visitors to send text mes

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DWDM (Dense Wavelength Division Multiplexing)

DWDM (Dense Wavelength Division Multiplexing)

DWDM stands for Dense Wavelength Division Multiplexing. DWDM is a technology used to increase the capacity of fiber optics that results in faster transfers of data. What are fiber optics? Fiber optics are very thin and small fibers that are used to transmit data and light throughout a computer and network. How does DWDM affect fibers? The DWDM takes different signals and sends them at varying wavelengths simultaneously along a single fiber. This allows a fiber to increase its capacity and in

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Wireless Routers

Wireless Routers

A wireless router is a wireless device that connects one computer or a whole network to another computer or network. It is possible to have a wireless network in a home or office. Travelers definitely come across wireless networks at most international airports. A wireless router, which is responsible for sending information from one computer to another, powers a wireless network. The router help the user to share a single Internet connection between two or more computers, which can be on the sa

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Broadband

Broadband

Broadband is a term that is used consistently with different types of Internet connections. Generally, it is referred to Internet connections over fiber optic cables rather than telephone lines. Broadband in telecommunications means a wide range of frequencies that are available to transmit information. This eventually means that, wider the range of frequencies available, higher the amount of information that can be sent at any given point of time. For an easy way to picture a broadband Internet

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502 Proxy Error

502 Proxy Error

While surfing the Internet, if an end-user encounters a 502 proxy error, he or she will not be able to view the desired web page. The error message is commonly encountered when accessing websites through a proxy server. The problem is typically caused for one of two reasons: 1 – The Internet Security and Acceleration (ISA) is configured to throw a proxy error to help guard against external or internally-based Internet threats, and 2- The client or server computers are misconfigured or using ou

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RPC Server Unavailable

RPC Server Unavailable

An RPC (Remote Procedure Call) is a technique used in computer science that allows an application to contact a separate application or service within the same hard drive or on a remote location. While the application initiating the call is known as the "client," the application or location that is being called is referred to as the "server." RPC is very popular and is used as a basic framework for several networking systems. For example, RPC is used in print spoolers for communication between a

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