Q17 /20 Choose the two incorrect options regarding SLOs (service level objectives) and SLAs...
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Choose the two incorrect options regarding SLOs (service level objectives) and SLAs (service level agreements) in the context of site reliability engineering.
Show answer & explanation
Option A is incorrect because legal liability attaches to SLAs (customer-facing contracts), not SLOs (internal engineering targets). Option C is incorrect because SLAs are typically set at higher-reliability targets than SLOs—SLAs are stricter commitments to customers, while SLOs provide internal breathing room for maintenance and experimentation. Options B and D are correct: SREs use error budgets to intentionally cause controlled outages within SLO bounds, and SLAs are indeed set considering competitive benchmarks, engineering feasibility, and customer requirements.
Step-by-step Derivation:
Recall SRE definitions: (1) SLO = internal reliability target; SLA = customer-facing contract with legal consequences. (2) SLA ≥ SLO (SLA stricter); error budget allows SRE to fail up to SLO. (3) Evaluate each statement: A—legal liability applies to SLAs not SLOs (FALSE); B—error budget mechanism allows controlled failures within SLO (TRUE); C—SLAs harder than SLOs is backwards (FALSE); D—SLA setting factors include competition, engineering, customer needs (TRUE). Two incorrect: A and C.