In IP Class - A addresses, the _________ byte is reserved for net
| In IP Class - A addresses, the _________ byte is reserved for network ids.
A. fourth
B. second
C. third
D. first
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
- The IP address is an address having information about how to reach a host (specific host), especially outside the LAN.
- An IP address is a 32-bit unique address having an address space of 232.
- The 32 bit IP address is divided into five sub-classes.
- Class A
- Class B
- Class C
- Class D
- Class E
- The order of bits in first octet determinants the classes of IP address.
- IPv4 address is divided into two parts.
- Network ID
- Host ID
Dotted decimal notation:
Hexadecimal notation:
Class A:
- Network ID is 8 bits long
- The host ID is 24 bits long.
- In IP Class - A addresses, the first byte is reserved for network ids.
- The higher-order bit of the first octet in class A is always set to zero. The remaining 7 bits in the first octet are used to determine network ID.
Class A has total of
27 – 2 = 128 – 2 = 126 Network ID
224 – 2 = 16777216 – 2 = 16777214 Host ID
[2 address is subtracted because 0.0.0.0 and 127.x.y.z are special address]
Default subnet mask for class A is 2555.x.x.x.