Monday, August 21, 2006
Packet sniffer
A Packet sniffer (also known as network or protocol analyzer or Ethernet sniffer) is computer software (usually) or computer hardware that can intercept and log traffic passing over a digital network or part of a network. As data streams travel back and forth over the network, the sniffer captures each packet and eventually decodes and analyzes its content according to the appropriate RFC or other specifications. Depending on the network structure (hub or switch) one can sniff all or just parts of the traffic from a single machine within the network; however, there are some methods to avoid traffic narrowing by switches to gain access to traffic from other systems on the network (e.g. ARP spoofing). For network monitoring purposes it may also be desirable to monitor all data packets in a LAN by using a network switch with a so-called monitoring port (it mirrors all packets passing through all ports of the switch).
The special network device driver used for some packet sniffing software is said to operate in "promiscuous mode" as it listens to everything on the wire.
Friday, August 18, 2006
Between the extremes of optimal health and death from starvation or malnutrition, there is an array of disease states that can be caused or alleviated by changes in diet. Deficiencies, excesses and imbalances in diet can produce negative impacts on health, which may lead to diseases such as scurvy, obesity or osteoporosis, as well as psychological and behavioral problems. Moreover, excessive ingestion of elements that have no apparent role in health,For example lead, mercury, PCBs, dioxins), may incur toxic and potentially lethal effects, depending on the dose. The science of nutrition attempts to understand how and why specific dietary aspects influence health.
Friday, August 04, 2006
Hockey is any of a family of sports in which two teams comptetively trying to maneuver a ball, or a hard round disc called a puck, into the opponent's net or goal, using a stick. The dominant version of hockey in a particular region tends to be known simply as hockey, other forms being more fully qualified.
Field hockey is played with a ball on gravel, grass or sand-based or water-based artificial turfs.The game is popular among both genders in many countries of the world, particularly in Pakistan, India, Europe, Australia, New Zealand, and South Asia, though in the United States and Canada it is predominantly played by women. Its governing body is the International Hockey Federation .
Modern field hockey sticks are constructed of a composite of wood, glass fibre and/or carbon fibre and have a curved hook at the playing end, a flat surface on the playing side and curved surface on the rear side.There are 4,000 year old drawings in Egypt of a game resembling field hockey being played. While modern field hockey appeared in the mid-18th century in England, primarily in schools, it was not until the first half of the 19th century that it became firmly established, the first club being created in 1849 at Blackheath in south-east London.after it was played by more countries.
