Wednesday, April 15, 2009

Rubella-lu-like symptoms


Rubella is an illness with flu-like symptoms followed by a rash. Common symptoms include

* Low-grade fever
* Headache
* Runny nose
* Red eyes
* Muscle or joint pain

Rubella is usually mild. You may get it and not even know it. However, adults who get rubella often feel sicker than children do. The biggest danger of rubella is if a woman gets it during the first 20 weeks of pregnancy. She may lose the baby, or the virus could cause problems to her unborn baby. Those problems could include cataracts, deafness or damage to the heart or brain.

A virus causes rubella. It can spread from one person to another through the air or through close contact with someone who has it. There is no treatment for rubella, but the measles-mumps-rubella (MMR) vaccine can prevent it.

Thursday, April 9, 2009

Campus area network (CAN)

A campus area network (CAN) is a computer network made up of an interconnection of local area networks (LANs) within a limited geographical area. It can be considered one form of a metropolitan area network, specific to an academic setting.

In the case of a university campus-based campus area network, the network is likely to link a variety of campus buildings including; academic departments, the university library and student residence halls. A campus area network is larger than a local area network but smaller than a wide area network (WAN).

The main aim of a campus area network is to facilitate students accessing internet and university resources. This is a network that connects two or more LANs but that is limited to a specific and contiguous geographical area such as a college campus, industrial complex, office building, or a military base.

Thursday, April 2, 2009

Computer network nodes

In data communication, a node may either be a data circuit-terminating equipment (DCE) such as a modem, hub, bridge or switch; or a data terminal equipment (DTE) such as a digital telephone handset, a printer or a host computer, for example a router, a workstation or a server.

If the network in question is the Internet, many network nodes are host computers, identified by an IP address, and all hosts are nodes. However, datalink layer devices such as switches, bridges and WLAN access points do not have an IP host address (except sometimes for administrative purposes), and are not considered as Internet nodes, but as network nodes.

If the network in question is a peer-to-peer or overlay network, nodes that actively route data for the other networked devices as well as themselves are called supernodes. Nodes that route between supernodes are commonly referred to as "super-duper" nodes.