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Prepare for CCNA 200-301 v1.1 with 100 focused topics, each paired with a recall guide and an original practice exercise. Build understanding through packet tracing, subnet calculations, lab evidence, troubleshooting and spaced review. These are independent study guides; 200 is the collection size, not the number of questions on the exam.
Reviewed 2 November 2026. Check Cisco’s current exam information before booking. Reading paths are study groupings and do not represent official exam weights.
Ten focused reading paths with 20 articles each. Start from routing and fabric behavior, then explore transport, name resolution, security, host performance, storage, availability and incident evidence.
Choose a platform to explore 50 guides, from a first task brief to reusable workflows. Microsoft Copilot guides cover the consumer and Microsoft 365 experiences; in-app features depend on your account and license.
Oracle Database
A connection may reach a primary, standby or a database in an unexpected open mode. Establish the current role before planning any action.
Read article : Confirm database role before diagnosing a Data Guard issueOracle Database
A standby may receive redo late or stop receiving it entirely. Interpret the lag value with the age of its source data.
Read article : Measure Data Guard transport lag with fresh timestampsOracle Database
A standby can receive redo promptly while recovery applies it slowly. Compare apply and transport metrics rather than treating all lag as network latency.
Read article : Separate Data Guard apply lag from redo transport delayOracle Database
A missing redo range can prevent managed recovery from advancing. Inspect the gap view before manually copying files.
Read article : Identify a blocking archived-log gap on a standbyOracle Database
A standby connection issue often leaves a useful error at the sending destination. Inspect enabled destinations on the primary.
Read article : Read primary-side archive destination errors before changing transportOracle Database
A standby may be mounted correctly while redo apply is stopped or waiting. Inspect the Data Guard processes in the appropriate database.
Read article : Inspect Data Guard recovery processes using the current process viewOracle Database
A broker warning summarizes a configuration condition but usually needs database-specific detail. Start with the managed configuration view.
Read article : Use the Data Guard broker summary as an entry pointOracle Database
A configuration-wide warning may originate from only one member or property. Collect the detailed state before changing transport settings.
Read article : Inspect a specific Data Guard broker member in detailOracle Database
A healthy-looking standby can still have configuration or recovery gaps that complicate a switchover. Gather readiness diagnostics in advance.
Read article : Use broker validation before planning a role transitionOracle Database
Redo transport can reject a destination when database identity does not match the expected configuration. Compare unique names rather than editing credentials first.
Read article : ORA-16047: compare Data Guard database identity settingsOracle Database
A standby can be reachable while redo shipping fails authentication. Check the actual remote login path and password-file management process.
Read article : ORA-16191: investigate redo-transport authenticationOracle Database
The broker can report stopped apply while the underlying database log contains the real failure. Capture the exact apply error.
Read article : ORA-16766: investigate why redo apply stoppedOur original short guides to AI, account protection, and recovery.