In IP Class - A addresses, the _________ byte is reserved for net

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.