Computer & IT

note!Answer: C) limited broadcast.
An IPv4 address of all 1s (255.255.255.255) is the limited broadcast address, used within the local network.

note!Answer: B) Individual computer.
In a DNS name such as www.example.com, the leftmost label is the host name of an individual computer.

note!Answer: C) 5.
IPv4 defines five address classes: A, B, C, D (multicast), and E (reserved).

note!Answer: D) Both (A) and (B)
UDP is a connectionless protocol that sends independent messages (datagrams) without establishing a connection. Both A and B are therefore correct.

note!Answer: B) PrintStream
System.out is a static PrintStream object in the java.lang.System class, used for printing to the standard output.

note!Answer: C) 2^4 - 1
1111 in binary is 8+4+2+1 = 15, which equals 2^4 - 1.

note!Answer: D) 160
Hex A0 = 10×16 + 0 = 160 in decimal. The 'O' is likely a typo for zero.

note!Answer: D) 11000011
C = 1100 and 3 = 0011, so C3 = 11000011 in binary.

note!Answer: C) alphanumeric and other common symbols
ASCII is a 7-bit code representing letters, digits, and common symbols for information interchange.

note!Answer: C) 0110
The 1's complement inverts every bit, so 1001 becomes 0110.

note!Answer: B) 1100
4 is 0100, its 1's complement is 1011, and adding 1 gives 1100.

note!Answer: C) when each decimal digit is represented by four bit binary
Binary Coded Decimal represents each decimal digit separately as a 4-bit binary group.

note!Answer: B) a NOR gate
A NOR gate outputs high only when all of its inputs are low.

note!Answer: C) 2^n
Each of n binary inputs has 2 values, so there are 2^n combinations.

note!Answer: B) modem
A modem (modulator-demodulator) converts digital signals to analog for transmission and back.

note!Answer: B) half-duplex mode
Half-duplex allows two-way transmission, but only one direction at a time.

note!Answer: D) all of the above
Operating systems manage I/O, virtual memory, and multiprogramming.

note!Answer: D) modem
A modem converts digital computer output into analog signals suitable for telephone lines.

note!Answer: B) 1024 bytes
In computing, 1 KB equals 2^10 = 1024 bytes.

note!Answer: B) keyboard
The keyboard is a primary input device used to enter data into a computer.