Question 1

What is the default subnet mask for a Class C IP address?

Accepted Answer

255.255.255.0, which provides up to 254 usable host addresses per network.

Question 2

Which IP address range is reserved for APIPA when a DHCP server is unavailable?

Accepted Answer

169.254.0.1 to 169.254.255.254. A device self-assigns an address in this range when it cannot reach a DHCP server.

Question 3

What is the primary difference between a public IP address and a private IP address?

Accepted Answer

Public IP addresses are routable on the internet and assigned by ISPs, while private IP addresses are used within local networks and are not routable on the public internet.

Question 4

How many bits make up an IPv6 address?

Accepted Answer

128 bits, written as eight groups of four hexadecimal digits separated by colons.

Question 5

What does CIDR notation /24 indicate about a subnet?

Accepted Answer

It indicates that the first 24 bits of the IP address are the network portion, equivalent to a subnet mask of 255.255.255.0.

CompTIA A+ Networking Fundamentals

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