N10-009 - Network Operations (19% of the exam) - Section 3.3

Explain high availability and disaster recovery concepts, including redundancy, failover, backups, and the RPO/RTO recovery metrics.

Explain high-availability designs - first-hop redundancy (FHRP), link aggregation, NIC teaming, and active/active versus active/passive clustering - that eliminate single points of failure. Distinguish the disaster-recovery site types (hot, warm, cold) and the recovery metrics RPO and RTO, and explain how backup strategy and testing satisfy a continuity objective.

High availabilityRedundancy and failoverRPO and RTOHot/warm/cold sites

Practice question for this objective

Free sampleNetwork Operationsmedium

During a business-continuity review, a team must state what distinguishes a warm recovery site from the other site types. Which statement is correct?

AIt has hardware and connectivity in place but restores data from recent backups, so recovery falls between a hot and a cold site. Correct
BIt provides just conditioned space and power, with servers procured and installed only after a disaster is declared.
CIt mirrors production data in near real time so the standby can take over within minutes of any outage.
DIt is a portable trailer of equipment driven to the incident location on demand after a disaster strikes.

A warm site keeps hardware and links ready but restores data from backups, giving a recovery time between a hot and a cold site. A warm site pre-stages servers and connectivity but does not replicate data continuously, so a failover still requires restoring the latest backups; this puts its recovery time above a hot site and below a cold site.

Why A is correct: Correct; a warm site is pre-equipped yet not continuously replicated, so data must be restored before cut-over, placing its recovery time between the two extremes.

Why B is wrong: Tempting because a warm site is not fully live, but bare space with no pre-installed equipment describes a cold site rather than a warm one.

Why C is wrong: Tempting because both types hold hardware, but near-real-time mirroring and minute-scale cut-over describe a hot site, not a warm one.

Why D is wrong: Tempting as an alternative recovery option, but a transportable unit is a mobile site and does not define a warm site.

See more N10-009 practice questions, answers explained.

Exam traps in Network Operations

Answers that look right on this material and are not. Each one is a distractor from a different question in the N10-009 bank for this domain.

A warm site, because its partially configured hardware can be provisioned and brought online within a day of the failure.
Why it is wrong: A warm site is a reasonable middle-ground choice, but its partially prepared systems typically take hours to a day to bring up, which overshoots a fifteen-minute RTO.
The schedule meets the objective, because a daily backup guarantees that no more than four hours of committed data are lost.
Why it is wrong: This is tempting if RPO is misread as a fixed guarantee of any backup, but a once-daily backup can leave almost a full day of data unprotected, so it does not meet a four-hour RPO.
A cold site delivers the shortest recovery time because it holds no data that must be synchronised before cut-over.
Why it is wrong: Tempting because a cold site has little to synchronise, but with no hardware or data staged it actually takes the longest to recover, not the shortest.

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