Palo Alto Networks (PANW) Certified Cybersecurity Entry-level Technician (PCCET) Practice Exam

Which class of address begins with the decimal 130 in the first octet?

1. Class A

2. Class B

3. Class C

4. Class D

The correct answer is: Class B

The correct answer is that addresses that begin with the decimal 130 in the first octet are classified as Class B addresses. In the context of IP addressing, the first octet of an IPv4 address determines its class based on specific ranges. Class A addresses range from 1 to 126 in the first octet. Class B addresses cover the range from 128 to 191. Therefore, an address starting with 130 falls within the Class B range, which is significant for both network size and broadcast capabilities. Class C addresses range from 192 to 223, and Class D addresses, which are used for multicast groups, range from 224 and above. Thus, 130 does not fit into these classes. Understanding these classifications is essential for subnetting and addressing in networking.