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 10.5.6.2 10.7.8.3
Try an answer before revealing the guidance below.
Key Concepts
- No prefix length given
- Classful default mask
- Class A /8
- Network number
Answer Approach
- Notice that no prefix length is supplied.
- Decide which default mask applies, and state the assumption.
- Apply that mask to each address and compare the results.
Full Answer
Answer status: Draft answer (unofficial). Revision notes, not an official marking scheme.
No prefix is given, so use the common (classful) assumption: 10.x.x.x is a Class A address with an 8-bit network part (/8, mask 255.0.0.0). All three addresses share the first octet 10, so they are in 1 network: 10.0.0.0.
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