Internal and external enterprise network
Network Intranet (internal). Outsiders do not have access to the Intranet-corporate network without authorization and password.Access to them can only be accessed by the user as a privileged access to the internal corporate LAN. Internal networks Web-servers are located within the network, and the use of the browser is the primary means of access to different data stored on those servers.
Network Extranet (external) called an internal network (Intranet), part of which have access to and authorized external users. While the internal network (Intranet) is behind a firewall and is accessible only to employees of the company or organization, a network Extranet provides different levels of access to unauthorized external users. The user can access the external network (Extranet) only if it is registered in the network name and password and user ID allowed him to determine the level of access and available for viewing on foreign network (Extranet. access is usually done by passwords, identity (ID) users and other security tools at the application level. Typically, they are used to support connections of customers, suppliers, business partners and the communities of interest to the corporate internal network (Intranet) on a shared infrastructure using dedicated lines.
The physical components of the network
Equipment connected to the network segment, called a network device ( device ).
There are four categories of physical components of the network:
1) PC (personal computers - PCs) - end-user devices, send and receive data . End User Devices that connect it to the network, also called endpoints nodes or stations (host) .
These devices are physically connected to the network by the end device using a network connection to perform tasks such as sending email, surfing, downloading files, and access to databases.
2) Interconnection [ ? nt? k? ' NEK ? (?) n] - compounds that consist of components for the flow of data from one point to another network. It is a Network Interface Card ( Network Interface Card – NIC ), also referred to as network adapters , this cable or medium of wireless networks, connectors (connectors or sockets, for example RJ-45 connector). Each NIC card has a unique code , called a MAC-address .
3) Switches - Switches – Devices that connect to the network for end users and perform intelligent switching of the data within a local network.
4) Routers - are used to connect networks together and select the best route between them.