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This lesson will cover the fundamentals of the Domain Name System (DNS), including key record types like A, AAAA, CNAME, and the special Route 53 Alias record. We will then explore Amazon Route 53's core functions, focusing on Public Hosted Zones for DNS management. The main part of the lesson will be a deep dive into the various routing policies available in Route 53: Simple, Weighted (for load balancing/testing), Latency-based (for performance), Failover (for disaster recovery), and Geolocation (for content localization). Each policy will be explained with a practical use case relevant to a solutions architect.
Introduction to AWS object storage with Amazon S3. Covers core concepts like buckets, objects, and keys. Detailed exploration of the S3 consistency model (read-after-write for new objects, eventual for updates/deletes). Deep dive into S3 Storage Classes: Standard, Intelligent-Tiering, Standard-IA, One Zone-IA, and the Glacier tiers. The session will focus on the role of S3 in modern data architecture as a scalable, durable, and cost-effective data lake storage layer, emphasizing the schema-on-read approach.
This lesson covers the fundamental principles of secure administrative access. It begins by explaining the significant security risks associated with direct root user logins, such as lack of accountability and high potential for accidental system-wide errors. It then introduces 'sudo' as the standard, more secure alternative, highlighting its key benefits: detailed command logging for auditing, the ability to grant granular privileges based on the Principle of Least Privilege, and simplified administration. The lesson will cover the practical steps for setting up initial sudo privileges by adding a user to the 'sudo' (Debian/Ubuntu) or 'wheel' (Red Hat/CentOS) administrative groups.
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