Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A network administrator is configuring a new server that needs to be accessible from the internet. The server will host a web application and requires a public IPv4 address. Which class of IPv4 addresses is typically used for public-facing servers and can be routed across the internet?
- APublic IPv4 addresses
- BClass B private addresses (172.16.0.0/12)
- CClass A private addresses (10.0.0.0/8)
- DClass C private addresses (192.168.0.0/16)
Show answer & explanationAnswer & explanation
Correct answer: A. Public IPv4 addresses
Public IPv4 addresses are globally unique and routable across the internet. Private IPv4 addresses (Class A, B, C private ranges) are used for internal networks and are not routable on the internet without Network Address Translation (NAT).
Why the other options are wrong
- B. Class B private addresses are for internal networks and are not routable on the internet.
- C. Class A private addresses are for internal networks and are not routable on the internet.
- D. Class C private addresses are for internal networks and are not routable on the internet.
Public vs. Private IPv4 Addresses
Public IPv4 addresses are globally unique and routable on the internet, whereas private IPv4 addresses are reserved for internal networks and are not routable on the internet.
- Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.
- NAT is required for devices with private IP addresses to access the internet.
- Public IPs are assigned by Regional Internet Registries (RIRs).
Memory trick: Public for the world, private for the home.