Networking Quiz: 12 CCNA-Style Questions
This free networking quiz checks the fundamentals behind CCNA and support roles: the OSI model, TCP versus UDP, private IPv4 ranges, subnet masks and CIDR, the default gateway, DNS records, DHCP, ARP, well-known ports, switches versus routers and IPv6 basics. It suits students and anyone starting in IT support or network administration. Answer all 12 questions, check your score, then read the explanations and revisit the networking basics guide for weak spots.
Frequently asked questions
Is this quiz useful for CCNA preparation?
It covers foundation topics that appear in CCNA, but it is not an official practice exam. Use it to find gaps before deeper study.
How do I work out usable hosts in a subnet?
Subtract the prefix length from 32 to get the host bits, then calculate 2 to that power minus 2. For example, a /26 has 6 host bits, so 64 minus 2 gives 62 usable hosts.
Why are some IP addresses called private?
RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 for internal networks. They are not routed on the public internet, so routers use NAT to reach it.