2.5 IPv4 Flashcards
What is the structure of an IPv4 address?
A 32-bit address, written as four decimal numbers separated by dots (e.g., 192.168.1.4).
How many bits are in an IPv4 address?
32 bits.
What is the purpose of a subnet mask?
It defines the network and host portions of an IP address.
What is the default subnet mask for a Class A network?
255.0.0.0
What is the default subnet mask for a Class B network?
255.255.0.0
What is the default subnet mask for a Class C network?
255.255.255.0
What is the IP address range for Class A?
1.0.0.0 - 127.255.255.255
What is the IP address range for Class B?
128.0.0.0 - 191.255.255.255
What is the IP address range for Class C?
192.0.0.0 - 223.255.255.255
What is the purpose of Class D addresses?
Reserved for multicast communication (224.0.0.0 - 239.255.255.255).
What is the purpose of Class E addresses?
Reserved for experimental use (240.0.0.0 - 255.255.255.255).
What are the three private IP address ranges?
10.0.0.0 - 10.255.255.255 (Class A), 172.16.0.0 - 172.31.255.255 (Class B), 192.168.0.0 - 192.168.255.255 (Class C).
What is a public IP address?
An IP address routable over the internet, assigned by ISPs.
What is a private IP address?
An IP address used within a local network (LAN) that is not routable over the internet.
What is the loopback address?
127.0.0.1, used for local network testing.
What is an APIPA address?
169.254.x.x, automatically assigned when DHCP fails.
What does CIDR stand for?
Classless Inter-Domain Routing.
How does CIDR notation work?
It replaces traditional subnet masks (e.g., /24 is the same as 255.255.255.0).
What is the CIDR notation for a Class C network?
/24 (255.255.255.0)
What is the CIDR notation for a Class B network?
/16 (255.255.0.0)
What is the CIDR notation for a Class A network?
/8 (255.0.0.0)
How does subnetting help networks?
It divides a large network into smaller, more manageable subnetworks.
How many hosts can a /24 subnet support?
254 usable hosts (256 total, minus network and broadcast addresses).
What does an IP address ending in .0 represent?
The network address.
What does an IP address ending in .255 represent?
The broadcast address.
