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A Computer network is comprised of different devices to share, transmit, and boost the signal, voice and data. Networkdevices or components are the physical parts connected to a network. There is a large number of the network devices
and are increasing daily. The basic network devices are: Individual Computers, Server, Hub, Switch, Bridges, Routers, Modems, Printers, DSL Modems
& Routers, Gateways, Network Interface Cards, Cabling & Wireless access point. The following is a overview of each of these
network devices.

INDIVIDUAL COMPUTERS: The personal computer is usually a desktop computer, a work station or a laptop. The
personal computers are most widely used in any organization or for personal use. The individual computers are the most common
types of the microcomputers.

SERVER: A server is a computer on a network, which process request and is used
to share the data and resources among the other computers in a network. A server stores all the necessary information
and provides the different services like, workstation computers logon access, internet sharing, print sharing, disk space sharing etc. There are
different types of servers e.g File and print server, database server, proxy server, Fax server, backup server etc. A database
server stores all the data and software, which may related to the certain database and it allows other network devices
to access and process the database queries. A file server is used to store the data of any user on
the network and a print server manages one or more printers in a network. Similarly a network server is a
server that manages the network traffic.

NETWORK INTERFACE CARD: Network interface cards are attached with the computer or other
network devices and are used to provide the connectivity between the two computers. Each network card is specifically designed for
the different types of the network like Ethernet, FDDI, Token Ring and Wireless Networks firewall software. The Network card
operates on the first and second layers of the OSI models i. e Physical layer and datalink layer specifications. NIC
basically defines the physical connection methods and the control signals that provides the timings of the data transfer over the
network.

HUBS: Hub is a simplest network device. The function of the hub is broadcasting i.e data is forwarded
towards the all ports of a hub, regardless of whether the data was intended for the particular systems in the
network or not. Computers in a network are connected to a hub with a twisted pair (CAT5) cables. There are
two types of the hubs. 1. Active Hubs. 2. Passive Hubs.

SWITCHING HUB: The Switching hub (also called switch
is the most advance shape of the basic hub. In a basic hub all the computers are connected with the
hub and the speed of the network is defined by the slowest computer network card connected. For example if you
have 10/100 Mbps cards in a network and only one card of 10Mbps speed then the system cannot run faster
than the 10 Mbps. Now if you have a switching hub in a network, it will allow all the faster
connections in the network to remain at the higher speed and still interact with the 10Mbps system.

SWITCHES: Switch
is a intelligence device than hub. Switch is a layer 2 device. Swith provides the same function as a hub
or a bridge but it has the advance functionality of connecting the two computers together temporarily. Switch contains the switch
matrix or switch fabric that can connect and disconnect ports firewall software. Unlike hubs, switch only transmit or forwards
the data to the destined computer and it does not broadcasts the data to all its ports.

MODEMS: Modems
are the devices, which are used to translate the digital data into the analog format and vice versa. It performs
the two main functions. Modulation and demodulation. A modulated data can travel across the conventional telephone lines. The modem modulates
the signals at the sending end and demodulates at the receiving end. Modems are required for different types of the
access methods such ISDN, DSL and 56K data modem. Modem can be the internal devices that plug into the expansion
slots in a system or can be external devices that plug into the serial or USB ports. In Laptops, PCMCIA
cards are used for this purpose and many new laptops having the built in integrated modems. The specialized devices are
designed for use in the systems such as handheld computers. In ISPs where the large scaled modems are required, rack-mounted
modems are used.

ROUTERS: Routers route the data between two logically and physically different networks. A Router has the
capability to determine the destination address for the data and hence provides the best way for the data to continue
its journey firewall software. Router gets this capability through its software called routing software. Unlike Switches and Bridges, which
use hardware configured MAC address to determine the destination of the data, router uses logical network address such as IP
address to make the decision in determining the destination of the data.

GATEWAY: A gateway performs the function of
translating the data from one format to another format without changing the data itself. A gateway can be a device,
system, software. A computer with two NIC cards can function as a gateway. Router acts as a gateway e.g a
router that routes the data from a IPX network to a IP network is technically a gateway. The same can
be said of translational switch converts from a Ethernet network to a token ring network.

CABLES: There are two
most common types of the cables. 1. 10baseT and 10base2. 10baseT is a four paired cable. 10baseT has further two
types 1. UTP (unshielded twisted pair) and 2. STP (shielded twisted pair. STP is most secure cable covered with the
silver coated twisted paper to protect the cable. On the other end Thin 10base2 looks like the copper coaxial cabling
that often used to connect TV sets and VCR. 10baseT/Cat5 cables are most commonly used cables to connect the computers.
It has the connector, (like a telephone connector) called RJ45 connector.

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Laptop Batteries are essential for keeping a laptop running properly. In many cases, businesses, whether personal or corporate, dependon laptops for business dealings day to day. There are a number of ways to properly care and maintain a
laptops main power source, the battery. Battery construction of laptop batteries is very different from other traditional electronic device batteries.
A brief overview of the construction of laptop batteries will help provide insight into factors that affect the life and
care of laptop batteries.

Laptop batteries are constructed with a number of crucial components to regulate charge andpower supply to the laptop. A thermistor measures the charge of the battery and regulates how much charge the laptop
sends to the battery. When the battery is fully charged, the thermistor tells the laptop to stop charging. Safety fuses
and breakers in the laptop battery also help prevent overcharging and aid in overall functionality of the laptop battery. So
there is an essential communication that must occur between the components of the laptop battery and the laptop itself to
ensure proper function of both the computer and the power supply.

Laptop batteries are becoming more advanced thatother types of batteries. In the past they were constructed of NiCd or NiMH which provided less power and did
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There are a number ofprecautions to take to ensure safe and practical function of the laptop battery firewall hardware. Some laptop batteries can
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laptop is used. A laptop battery will not last very long without being charged. A useful method to extend battery
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These are just a few pieces of information about laptop batteries that will help the user
understand how to care for laptop batteries and how to manage laptop battery life. network security There is much
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