grceng.academy
Review lab 40 bonus XP

Review the IPv6 assurance memo

Start labRead the room

Objectives

The network owner submits six independent claims for a dual-stack rollout. The memo is titled 'IPv4 audit sufficient' and asks you to accept it without checking IPv6 behavior.

Judge each claim on its own technical merits. Reject incorrect claims using scope-error, compression-error, configuration-error or coverage-gap; accept correct claims even when a neighboring claim is wrong.

Verdicts are accept or reject. Every rejection needs one reason code from: scope-error | compression-error | configuration-error | coverage-gap.

Memo claims

N6-1 | fe80::27 can be routed between buildings by adding a normal router route.
N6-2 | 2001::42::17 is a valid compressed IPv6 address.
N6-3 | A stateful DHCPv6 address lease supplies the normal IPv6 default router without Router Advertisements.
N6-4 | An IPv4 deny test alone proves a dual-stack records service is isolated.
N6-5 | fd12:3456:789a::/48 is within the locally assigned unique local address range; internal routing still needs access controls.
N6-6 | IPv6 has no broadcast; ff02::1 is link-local all-nodes multicast.

Checks the server runs (3)

  • Every line in the fixture carries a verdict
  • Accept and reject land on the right lines
  • Each rejection cites a valid reason code

Check names are all you see here: the expectations that decide pass or fail, and the reference solution, stay on the server.

Step-by-step hints

The guided walkthrough, in full. It is free: no XP cost, and it does not touch the paid hint ladder or the reveal gate.

  1. Step 1

    Read the request before the artefact

    Read each statement as an independent assertion rather than approving the memo's title.

  2. Step 2

    Judge every line, including the boring ones

    Account for every supplied identifier exactly once, including claims that need no correction.

    Every line in the fixture carries a verdict

  3. Step 3

    Separate what is wrong from what is merely ugly

    Ask whether the described behavior follows from address scope, uniquely expandable notation, router discovery and tested protocol families.

    Accept and reject land on the right lines

  4. Step 4

    Say why, in the vocabulary the programme uses

    Match each rejected assertion to its root technical error. Do not use a scope classification reason for an incomplete assurance test.

    Each rejection cites a valid reason code

Rules summary

  • XP on pass

    40 bonus XP the first time every check goes green.

  • Paid hints

    2 available. Each costs 25% of the lab XP (about 10 XP).

  • Reveal solution

    Scores 0 XP and unlocks only after 3 check runs.

  • Attempt cap

    60 check runs per learner. The runner warns you in the last 10.

  • Drafts

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  • Walkthrough

    Always free and never penalised: use it before spending a hint.