OSI Model

OSI Model
	Data unit	Layer	Function
Host layers	Data	7. Application	Network process to application
		6. Presentation	Data representation, encryption and decryption, convert machine dependent data to machine independent data
		5. Session	Interhost communication, managing sessions between applications
	Segments	4. Transport	Reliable delivery of packets between points on a network.
Media layers	Packet/Datagram	3. Network	Addressing, routing and (not necessarily reliable) delivery of datagrams between points on a network.
	Bit/Frame	2. Data link	A reliable direct point-to-point data connection.
	Bit	1. Physical	A (not necessarily reliable) direct point-to-point data connection.

තර්කන දොරටු හා සත්‍යතා වගු

තාර්කික ද්වාර (Logic Gates) 

  විද්‍යුත් පරිපථ සඳහා බවිත කරන මෙය අධාන(INPUT) 2 කින් හෝ ඊට වැඩි ගණනකින් හා ප්‍රතිදාන(OUTPUT) එකකින් සමන්විත වේ .

NOT Gate