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* Description: Knowledge of network adapter or network interface card
* Compatiablity: RDBMS 11g, 12c
* Date: 04:57 PM EST, 05/14/2017
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<1> Network Adapter:
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     |__ A network interface controller (NIC, also known as a network interface card, network adapter, LAN adapter or physical network interface,[1] and by similar terms) is a 
         computer hardware component that connects a computer to a computer network. Translate network single into electrical info that computer can accept.

         Early network interface controllers were commonly implemented on expansion cards that plugged into a computer bus. Now, it usually be re-equiped within motherboard.
	  
         The network controller implements the electronic circuitry required to communicate using a specific physical layer and data link layer standard such as Ethernet, Fibre Channel, 
         Wi-Fi or Token Ring. This provides a base for a full network protocol stack, allowing communication among small groups of computers on the same local area network (LAN) and 
         large-scale network communications through routable protocols, such as Internet Protocol (IP).

         The NIC allows computers to communicate over a computer network, either by using cables or wirelessly. The NIC is both a physical layer and data link layer device, 
         as it provides physical access to a networking medium and, for IEEE 802 and similar networks, provides a low-level addressing system through the use of MAC addresses that 
         are uniquely assigned to network interfaces.
		 
        
<2> Network Interface Card by Linux utility ifconfig:	
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     |__ o. eth0 is the first ethernet interface. (Additional ethernet interfaces would be named eth1, eth2, etc.) 
            This type of interface is usually a NIC connected to the network by a category 5 cable.
         o. lo is the loopback interface. This is a special network interface that the system uses to communicate with itself.
         o. wlan0 is the name of the first wireless network interface on the system. Additional wireless interfaces would be named wlan1, wlan2, etc.
         o. eth0, eth8, radio0, wlan19, .. always represent an actual network hardware device such as a NIC, WNIC or some other kind of Modem. 
            As soon as the device driver is loaded into the Kernel a corresponding physical network interface becomes present and available.