A firewall forms a part of a network, which is often used to prevent any sort of unauthorized access. A firewall is a device that can be used to encrypt, decrypt or even proxy computer traffic among several security domains. Firewalls are used to block the users from accessing information that are highly confidential. Intranets serve a special purpose. It acts as a gateway and allows messages to pass through a firewall. Those messages that do not satisfy the security criteria are often blocked from entering into the intranet, by the firewall. Often routers are used to direct the messages to the respective destination inside and across a network. It usually connects logical subnets and route the packets to the final destination. A server is a very important pert in a network. Quite often servers provide numerous services to the clients who request for any application. Without a server, network cannot function. A server acts as a central machine in providing a number of services to the clients. All the requests that come from the clients are transmitted in the form of messages or packets. Routers play a very crucial role in allowing connectivity to a project. It often acts as gateways to route the packets. In many telecommunications, routers are used.

The Samsung M183ST is a low-end 23 litre 3D-Shower Wave type microwave oven, capable of Multi-Stage Cooking, Automatic Defrosting, and basic cooking. The oven allows users to select from five different power levels and three preset menus, based on the type of item being placed inside. The Auto-Defrost feature suggests the cooking time based on the weight of the food. The glass turntable is easy to remove and clean. However, the Epoxy interiors are not stain-resistant, and are of poor quality. The metal exteriors tend to rust in humid conditions, giving the oven a poor appearance. The programmable panel has large feather-touch buttons. A large LED display and a bright internal light make this microwave oven ideal for home use.