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CCNA Subnetting Challenge

Seven subnetting and addressing problems against the clock — no equipment needed.

8 tasks About 30 min Intermediate Free
Task 1 of 8

Usable hosts

How many usable host addresses does a /26 subnet provide?

Task 2 of 8

Network address

What is the network address of host 192.168.10.77/27?

Task 3 of 8

Broadcast address

What is the broadcast address of 10.1.4.0/22?

Task 4 of 8

Dotted mask

Write the /20 prefix as a dotted-decimal subnet mask.

Task 5 of 8

Right-size the subnet

What is the longest prefix (smallest subnet) that still gives at least 500 usable hosts? Answer like /23.

Task 6 of 8

Private addressing

Which address is a private (RFC 1918) address?

Choose one answer
Task 7 of 8

IPv6 shorthand

Write 2001:0db8:0000:0000:0000:ff00:0042:8329 in its shortest form.

Task 8 of 8

Your assigned host (unique to you)

Your lab was assigned VLAN 85 and host number 123. On the 192.168.85.0/24 network, write the full IPv4 address of host 123.

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