Computer Network Management

Today it is almost inconceivable for businesses do not have computers, whether it is a construction company or high technology firms. When a business has more than one computer, they almost always are linked together in a local network. These network s can be more or less developed and therefore more or less expensive.
Companies invest so much (in terms of money and time) in the local network s because there are many advantages that local network leads to business and how it is managed.
Some companies are using local network thus owes it always works.If network company, you will see all employees chatting away in the corridors, because they can't do their job.This means large losses for the company and it was stressed to all companies must consider their local network 's vital assets while avoiding downtime. This places huge demands on staff network keep such network s, works almost 100% of the time.
Advantages of computer management
One of the best aspects of installation and maintenance of the network is able to, they created to improve communication and collaboration between employees and customers.
Security: Security local network can help. Comprehensive security is advantageous because Central and secure data access strategy provides disaster recovery and all information is protected by designing and implementing security solutions network. On the other hand of interconnected computers on the local network s poses a security risk because it is so make technically possible for malicious users to access many machines in network.
Cost considerations: installing local network is rather costly project. Servers, cables, switches, routers and software can be expensive and should never be purchased without expert consultation. saving network, operation and a safe also requires a lot of resources and can be expensive.
Strangely enough local network could have several savings.Resource sharing eliminates the need to purchase equipment for everyone.More importantly, provide local network. data loss can cost your business is a lot of money, and in some cases, cause the business to complete the work as a whole. Computer management is regular backup data with regular quality reviews-practices that save companies huge amounts in the event of an accident.
NetworkComputer management: a preliminary analysis of stages
In the first stage managing computers network is to identify the source of the problem (preliminary study, which looks a bit different options may be useful here) and determine the specification of requirements that must be evaluated examples of various network operating systems, e-mail systems and other applications should also assess the choice of hardware components.At this stage usually is intended to establish that the system should do, not what it should do so.
Computer management network: design phase
The design Goal is to determine how requirements specifications must be met.The current approach for large and complex projects is to break them into smaller, more manageable subprojects.
Computer management network: implementation phase
This step includes the physical installation of the local network. Cables, install software and computers and other devices to put in place.
Computer management network: integration and test phase
At this stage commissioning network starts and procedures suited to users and service personnel should be validated systems, for example, to comply with the requirements laid down in the specification network and that it is stable enough to act as a central, it is in your organization.
Computer management network: operation and maintenance
Local network s have complex operating procedures; this is because there may be serious consequences if an error occurs, or unauthorized access to the many companies have employees devoted exclusively to the care and maintenance of computer network sec These systems administrators responsible for network, performance, reliability and security of hardware and software.
Computer management network: tools
Although your organization may have computer administrators on a site, they must also monitor network more than eight hours a day, in fact, some of the worst trouble arises from network s can occur at night when nobody used network. using the management tools the right computer network your organization can receive security knowing that problems will be provided to prevent and to take care of-and that administrator network can be notified at the time of notification, should anything go very wrong.

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General information about computer network devices & components

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A Computer network is comprised of different devices to share, transmit, and boost the signal, voice and data. Network devices 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 computer's 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. 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. 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. 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.
Twisted pair cables are ideal for the small, medium or large networks.

My recommendation for using cables for networking is to use 10baset/Cat5 cables

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Computer Networking

Ing network computer is a process of communication and shared resources between two or more connected computers. Shared resources you can turn on the printer, a fax modem, hard drive, CD-DVD-Rom, databases and data files. Computer network can be divided into small or local network, network ing between computers in the Office (LAN), medium network (MAN), network between all network WAN network between computers and two branches in the city, it is saved on the local and the other one can be thousands of miles away in any other country in the world.
Connectivity is achieved by network device known as the "Router" Internet is the world's largest global network where millions of computers from all over the world and relate to each other.
Ing network is the practice of combining two or more computers or devices with each other. connection can be wired or wireless network. Computer network can be classified differently, as mentioned above, depending on the geographic area.
There are two main types of network client server and peer-to-peer. Client server computing, the computer plays an important role, known as the server where the database files, the data in the form of Web pages, documents, or spread sheet files, videos, and resources are placed.
All other client and server computers network referred to as a client, and they get their data from the server.In a peer-to-peer network all play the same role and not a computer as a centralized server.In large enterprises worldwide client server network model is large.
Topology network defines the structure, design and layout network. There are various bus topology, ring, Star, mesh, hybrid, etc. Star topology is the most commonly used network topology.Star topology, all computers in network linked to a central device such as a hub or switch is thus forms a star like structure if the switch node fails for any reason, all connections and communications between computers in network will be stopped.
In General network language used computers and network devices and this language is called protocols commonly used and popular protocols on the Internet and in home and other network s called TCP/IP: TCP/IP is not singleprotocol, but it is a set of multiple protocols.
Network can be wired or wireless connection and TCP/IP can function as types network.
Dataflow computer network can be divided into seven logical tiers, called OSI layersmodel, Intel and Xerox Corporation and has been standardized BY ISO.
1. application layer
2. presentation layer
3. Session layer
4. transport layer
Network level
6. data link layer
a. Media access control layer sub-
b. logical link control layer sub-
7. physical layer.
In network can be divided into different levels and ranges and it depends on the requirements network and geographical location. computer network can be divided into local network, personal room network Centre network, wireless LAN, urban network network and all network.
There are several Network connection, HomePNA, power line communication method. (a) the Ethernet and WiFi network also may be divided into several different types, based on services provided by a server farm, storage area network s, the costs of managing network s, additional network s, SMALL network, wireless network and jungle network sec.

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