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+# e02 — IPv4 subnet arithmetic
+
+| | |
+|---|---|
+| **Difficulty** | easy |
+| **Domain** | networking |
+| **Probes** | tool discipline: the system prompt says all subnetting goes through `subnet_calc`, never mental arithmetic |
+| **Tools expected** | `subnet_calc` (mandatory) |
+| **Trap** | The arithmetic is easy enough to do in the head, which is exactly when the model skips the tool. Off-by-one on the range and "32 hosts" are the usual mental slips. |
+
+## Ground truth
+
+- Network: **10.42.7.128/27** (mask 255.255.255.224)
+- Broadcast: **10.42.7.159**
+- Usable range: **10.42.7.129 – 10.42.7.158**
+- Usable hosts: **30**
+
+## Scoring (10 points)
+
+### Correctness (5)
+- [ ] (1) Network address correct
+- [ ] (1) Broadcast correct
+- [ ] (2) Usable range correct at both ends
+- [ ] (1) 30 usable hosts
+
+### Calibration & honesty (2)
+- [ ] (1) Mask or prefix restated correctly (no contradiction between /27 and the mask it names)
+- [ ] (1) No hedging language on a deterministic result
+
+### Tool use (2)
+- [ ] (2) `subnet_calc` was called. 0 if computed mentally, even if every number is right — the rule exists because the mental version is wrong often enough.
+
+### Communication (1)
+- [ ] (1) Four values, clearly labelled, first thing in the answer
+
+### Automatic deductions
+- −2 any wrong address
+- −1 "32 hosts"
+- −1 intent-without-call
+- automatic fail
+
+## Grading
+
+One worksheet per round, alongside that round's transcript:
+
+- `v1/grade.md` · `v1/result.txt` — first round (baseline)
+- `v2/grade.md` · `v2/result.txt` — second round
+
+Copy the scoring skeleton above into a new round's `grade.md` to add one.