mario

Short term insurance coverage is ideal for people who are in transition and acts as a stopgap arrangement for people on the lookout for an ideal long term insurance policy. The insurance coverage ranges from emergency medicine, prescription drugs, intensive care, lab and x-ray, ambulance and to some home and hospital care. most short term health insurance policies are considered as "indemnity plans" (fee-for-service) that help a person in selecting any doctor or hospital he likes. Many of the short term health insurance policies are flexible and can extend coverage to spouse and dependents.

Due to its low cost, the short term health insurance coverage does not support dental or optical care, and preventative care like physical exams, immunizations and PAP tests. One of the important aspects to remember while taking a short term health insurance policy is that it does not cover any pre-existing medical conditions. most short term health insurance coverage is only available to people under the age of 65.

A short term health insurance plan is the right health coverage for you, if you are in need of immediate coverage, between jobs, newly employed and waiting for your group coverage to begin, a temporary or seasonal employee, a recent college graduate, looking for an affordable alternative to COBRA, on strike, laid-off or a terminating employee, and unable to afford other coverage. In theses situations, short term health insurance coverage offers you and your family with much-needed protection.

Short term health insurance policies are normally non-renewable. For extending coverage, you have to re-apply. Although many insurance companies limit coverage to six months, the short term health insurance coverage is generally available for between one and twelve months. Short term health insurance is a very affordable policy. Owing to its low monthly cost and high coverage limits, people opting for short term health insurance policy have increased during the last few years.

// posted by 62202 @ 6:21 PM 0 comments

A plumber is one whose job is to ensure that you are not standing in knee-deep water after every trip to the bathroom or every washing day, or every hour of dish washing. In a building, there are many systems in place and the system of drainage, drinking water, pipe work for heating and cooling systems, and other water pipes and these all come under the domain of the plumber.

For effective execution of all work under the banner of plumbing, a plumber has to hold a valid license. He must have a thorough knowledge of all the practical and theoretical aspects of the job. A good grasp of math, science and English helps. This job requires one to be ready to work whenever called, in cramped, often dirty places. Duct fixing, mechanical services, gas fitting, sanitary problems, water supply, roofing and draining are some of the main areas of expertise. To get a license, one has to have the requisite number of years in practical experience and pay the fees and the necessary insurance cover. References are needed from previous and current employers as well as the plumber under whom apprenticeship was completed.

The plumbing code gives a broad spectrum idea of the best and most modern methods of carrying out plumbing operations. Licenses ensure that only capable individuals are given the responsibility. Inspection and permits ensure that work is completed as per regulations.

In a house, plumbing constitutes almost 15% of the value of the house. It has to an efficient system. Drains, toilets, tubes, floor drains, fittings, faucets, compression faucets, kitchen sinks, lavatory bowls and bathtubs, water closets, tanks, shower equipment, water heaters, and pipes all come within the ambit of a plumbers job.

An efficient plumbing system in your home ensures good health for everyone and goes a long way in protecting the environment. A knowledgeable plumber makes sure the plumbing is as efficient as can be.

Plumbers provides detailed information on Plumbers, Emergency Plumbers, Registered Plumbers, Plumbers Supplies and more. Plumbers is affiliated with Snow Blower Parts .

// posted by 62202 @ 9:38 AM 0 comments

The backbone of a computer network uses 3 types of devices to interconnect computers -- hubs, switches and routers. Each is important and serves a different role in facilitating communication between networked computers. From the outside these devices may look similar -- small, metal boxes with multiple connectors or ports where ethernet cables are attached (routers may also expose other types of connectors). The terms 'hub', 'switch', and 'router' are often used interchangeably and misused -- in fact, the devices are quite different. Hubs are used to simply interconnect individual computers. Switches do the same (but more efficiently). However, routers interconnect different networks (as opposed to individual machines).

Network Hub:
Compared to switches and routers, hubs are the least expensive, simplest device on the network. All data that enters one port of the hub is sent out all the other ports. Hence, all computers connected to the same hub see each other's network communications. The hub doesn't pay any attention to the transmitted data, it simply passes it along to its other ports. A hub's value lies in the fact it is inexpensive and offers a quick and easy way to connect computers in a small network.

Network Switch:
The job of a switch is similar to a hub's -- but it does it more efficiently. Each packet of data (ethernet frame) that is transmitted on the network has a source and destination MAC address. A switch has the ability to remember the address of each computer attached to its ports and will act as a traffic cop -- only passing transmitted data to the destination machine and not all the others. This can have a significant positive affect on network performance because it eliminates unnecessary transmissions and frees-up network bandwidth. A switch can be thought of as the central component of a single network. It is used to interconnect devices on the network and to deliver layer 2 (OSI model) frames. A switch differs from a hub in that it does not retransmit frames to all other devices -- rather, a switch makes a direct link between the transmitting and receiving devices.

Network Router:
Compared to switches, routers are slow and relatively expensive. A router is an intelligent device that interconnects two or more networks for the purpose of delivering layer 3 (OSI model) packets. Since there may be more than one possible path, a router takes into account multiple criteria when determining which path to send the data packets. The fact that switches and routers operate at different layers of the OSI model indicates they rely on different information (contained in the frames or packets) to send data from a source to a destination.

An important difference between switched and routed networks is switched networks do not block broadcasts. As a result, switches can be overwhelmed by broadcast storms. Routers block LAN broadcasts, so a broadcast storm only affects the broadcast domain from which it originated. Since routers block broadcasts, they also provide a higher level of security than switches.

Analogy
Here's an analogy to help explain the difference between a router and switch -- a corporation's mail room. When an employee sends a letter it may (a) be delivered to its final destination by the company's internal mail delivery system or, (b) taken to the local Post Office (if the recipient resides outside the company). A switch represents the corporation's mail room, and a router the local Post Office.

A switch does not look inside the mail or examine the type of mail being delivered. The only logic behind a switch is a table of MAC addresses (one for each computer on the network) and which port a destination MAC is connected. That is, the switch stores a table of company employees and their office numbers and is responsible for delivering internal mail directly to employees. So, if mail arrives at the switch that is destined for an employee then a switch knows how to deliver it. A router, on the other hand, is responsible for delivering mail destined for individuals outside the company. In addition, routers can look inside the mail and delivery rules can be applied based on the mail's contents. This feature allows routers to play an important role in network security.

How a Switch Operates:
Switches are essentially multi-port bridges. They were designed to reduce the size of collision domains. In addition to faster CPUs and memory, two other technological advances made switches possible -- Content Addressable Memory (CAM) and application-specific integrated circuits (ASIC). CAM is memory that works backward compared to conventional memory -- that is, given a data value the memory returns the associated address. This allows a switch to directly find the port associated with a MAC address (the data value). An ASIC is a device that can be programmed to perform functions at logic speeds in hardware. The use of CAM and ASIC technologies greatly reduced the delays caused by software processing and enabled a switch to keep pace with the demands of high data rates in Ethernet networks.

Switches can operate in one of three modes -- store-and-forward, cut-through and fragment-free. The trade-offs are performance versus reliability. In store-and-forward switching the switch reads the entire frame and checks for errors. In cut-through switching the switch reads the beginning of the frame up through the destination MAC address. In fragment-free switching the first 64 bytes of a frame are read -- enough to determine whether or not it is a collision fragment (which account for the majority of frame errors).

The Layer 2 switch builds its forwarding table using MAC addresses. When a host has data for a non-local IP address, it sends the frame to the closest router (also known as its default gateway). The host uses the MAC address of the router as the destination MAC address.

How a Router Operates:
Just as a switch keeps a table of known MAC addresses, a router keeps a table of IP addresses known as a routing table. An important function of a router is to maintain these tables and make sure other routers are notified of changes in the network topology. This function is performed using routing protocols to communicate with other routers. When packets arrive at a router's interface it applies various criteria and protocols to determine the best path on which to transmit the packet to its next destination.

A router can be programmed to apply sophisticated rules based on the contents of the data packets that it sees. For example, routers can be programmed to act as hardware firewalls, can implement network address translation (NAT) and provide dhcp services to the network.

Because of their built-in intelligence, routers are generally considered the most complex devices on a network. In addition to directing packet traffic, routers can be configured to monitor network traffic, adapt to changes in the network that they detect dynamically, and protect networks by filtering packets and determining which packets will be blocked or allowed through.

Steve Leytus is a senior software engineer and develops applications for NutsAboutNets.com. For more information about AirSleuth 2.4 GHz Spectrum Analyzer and other low cost, PC-based diagnostic tools for installing, optimizing and trouble-shooting 802.11 (Wi-Fi) wireless networks please visit www.NutsAboutNets.com.

// posted by 62202 @ 3:07 AM 0 comments