For each of the groups of IP addresses below, identify how many distinct networks are represented, provide the network number(s) in each case and give a brief reason for your answer. 10.5.5.1/16 10.5.6.2/16 10.7.8.3/16
Try an answer before revealing the guidance below.
Key Concepts
- /16 prefix
- First two octets
- Network number
Answer Approach
- Keep the first 16 bits (two octets) of each address.
- Set the host bits to zero.
- Count the distinct results.
Full Answer
Answer status: Draft answer (unofficial). Revision notes, not an official marking scheme.
2 networks: 10.5.0.0/16 (10.5.5.1 and 10.5.6.2) and 10.7.0.0/16 (10.7.8.3). With /16 only the first two octets identify the network, and 10.5 differs from 10.7.
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