Answer:
The first IBM PC virus in the "wild" was a boot sector virus dubbed (c)Brain, created in 1986 by Amjad Farooq Alvi and Basit Farooq Alvi in Lahore, Pakistan, reportedly to deter unauthorized copying of the software they had written. The first virus to specifically target Microsoft Windows, WinVir was discovered in April 1992, two years after the release of Windows 3.0.
Explanation:
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Because, to put it simply, to use more complicated shapes requires more processing power which is unnecessary. Only if they would touch all parts of the shape should it be complicated.
Answer:
Physical / Data link layer
Explanation:
If two computers (A & B) are directly connected through Ethernet cable. A is sending data to B, the data would be transmitted if the network is clear but if the network is not clear, the transmission would wait until the network is clear.
The Open Systems Interconnection model (OSI model) has seven layers each with its own function.
The physical layer is the first layer responsible for data transmission over a physical link. The data packets are converted to signals over a transmission media like ethernet cable.
The data link layer is the second layer in the OSI layer responsible for transmission of data packets between nodes in a network. It also provides a way of detecting errors and correcting this errors produced as a result of data transmission.
Answer:
All three of them are linear Data Structures.
A stack is a FILO(First In Last Out) or LIFO(Last In First Out) type data structure means first inserted element will be the last one to be removed form the stack.Insertion and Deletion is from one end only called head.
ex:-A stack of books on the shelf.
A queue is FIFO(First In First Out) type means the first inserted element will be the first one to be removed.In queue insertion is from the back or tail and removal of elements is done form the front.
ex:-A queue at the ticket counter.
In array each element stored is given an index, by which we can be access the element very easily. We can use this index to modify or store element at that index of the array. i.e any object can be accessed with the right index, unlike queue and stack.
We can access only the front and back in the queue.In stack we can access only the top but in array we can access any element with the index.
