# TCS Papers: Sample Questions 181 - 183 of 502

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## Question number: 181

Essay Question▾

### Describe in Detail

What is Multiple Access?

### Explanation

• If the physical links are shared by more than two nodes, they are said to provide multiple access. In multi-access, all nodes are capable of transmitting frames. In addition, more than two nodes can transmit frames at the same time.

• For example, in multiple access radio transmission scheme several earth stations can transmit in the same time span, providing a way to network these stations together, in either a star or a mesh network.

## Question number: 182

Essay Question▾

What is VRC?

### Explanation

• VRC or vertical redundancy check or the partial check is least expensive mechanism for error detection.

• The redundant bit called parity bit is appended to every data unit so that the total number of 1’s in the unit becomes even.

• VRC can detect all single bit error

• Can detect burst errors if the total number of errors in each data unit is odd.

• VRC can’t detect errors where the total number of bits changed is even.

## Question number: 183

Essay Question▾

### Describe in Detail

What is the difference between the = symbol and == symbol?

### Explanation

• Assignment Operator (=)

• = is an Assignment Operator in c, c++ and other programming languages, it is Binary Operator which operates on two operands.

• = assigns the value of right side expression’s or variable’s value to the left side variable

• Example:

x= (a + b);

y = x;

• Here, when first expression evaluates value of (a + b). It will be assigned into x and in second expression y = x; value of variable x will be assigned into y.

• Equal To Operator (==)

• It is binary operator which operates on two operands.

• == compares value on left and right side expressions- return 1 if they are equal otherwise return will be 0;

• Example:

1. `int x, y;`
2. `x=10;`
3. `y=10;`
4. `if(x= =y)`
5. `printf(“True”);`
6. `else`
7. `printf(“False”);`
• When expression x==y evaluates, it will return 1 and “TRUE” will be printed.