Pass the Alibaba Cloud Computing CAP-C01 Questions and answers with Dumpstech

Function Compute and Simple Message Queue form an appropriate serverless, event-driven backend for bursty mobile workloads.

Function Compute is fully managed and automatically allocates elastic compute resources when functions are invoked. Alibaba Cloud bills Function Compute primarily according to actual configured resources and execution duration, allowing the startup to avoid maintaining continuously running application servers. This is particularly suitable for APIs and backend handlers experiencing unpredictable request spikes.

SMQ provides managed asynchronous messaging for decoupling backend components. It supports queue-based processing and publish-subscribe topics, making it suitable for notification events, background jobs, workflow messages, and traffic buffering. Alibaba Cloud explicitly identifies load leveling during sudden traffic spikes as an SMQ use case.

SMQ can also directly trigger Function Compute through queue or topic integrations, creating an event-driven design without dedicated message-consumer servers.

ECS requires persistent server resources and management, which conflicts with the requested serverless operating model. MaxCompute is a large-scale data warehouse and batch analytics platform rather than the application ' s transactional API or messaging layer.

Therefore, Function Compute supplies elastic execution while SMQ provides reliable asynchronous communication and notification-event handling.

Study Guide reference: Delivering Services and Content on Alibaba Cloud — Function Compute, serverless architectures, SMQ, event-driven integration, and elastic application services.

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Simple Log Service (SLS) is a managed log-ingestion, storage, query, analysis, and visualization service, making it the most operationally efficient front-end for this telemetry workload. It eliminates the requirement to provision and manage ECS-based collectors or a separate search cluster simply to ingest and analyze log records.

For longer-term retention, Alibaba Cloud supports automatically shipping SLS data to OSS. This creates a clean hot-to-cold architecture: maintain recent data in SLS for interactive analysis and export older data to OSS for economical retention.

OSS lifecycle management can then automatically transition aging objects to lower-cost storage classes such as Archive. Lifecycle rules are explicitly designed to automate storage-class transitions based on object age, eliminating manual archival administration.

Option A requires additional Elasticsearch retention administration. Option B requires managing ECS infrastructure even though the question explicitly prioritizes reduced operational management. Option D adds Kafka unnecessarily and still specifies manual archival, directly conflicting with the requirement to minimize operational effort.

Thus, SLS for managed ingestion and recent analysis combined with SLS-to-OSS shipping and OSS lifecycle transitions provides the strongest serverless/managed retention architecture.

Study Guide reference: Core Infrastructure Deep Dive; Core Storage Infrastructure; operationally efficient log and data-storage architecture.

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Tair (Redis OSS-Compatible) is the appropriate centralized session-state layer for an elastic, distributed application. When ECS instances frequently scale in and out, application sessions must not depend on the lifecycle of any individual compute node. By storing session tokens and session state in Tair, every ECS instance can retrieve the same session information, making the web/application tier effectively stateless and compatible with Auto Scaling.

Alibaba Cloud Tair is a fully managed Redis-compatible database designed for high throughput, low latency, elastic scalability, and high availability. Alibaba Cloud also documents session-oriented Tair use cases in which session tokens are stored as Redis/Tair data structures with TTL values, demonstrating precisely why the service fits distributed session management.

Session stickiness is weaker because it attempts to keep a user on a specific backend and therefore creates affinity to an instance that might be removed during scaling or failover. CloudMonitor is an observability service, not a session store. STS issues temporary Alibaba Cloud credentials and does not maintain application user sessions.

Consequently, separating session state from ECS compute by storing it in Tair gives the architecture the elasticity and fault tolerance required.

Study Guide reference: Distributed Architecture on Alibaba Cloud; Performant Architecture; Core Infrastructure Deep Dive.

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Alibaba Cloud Cloud Firewall is the purpose-built managed network-security service for centralized traffic inspection, filtering, access control, and threat prevention. It protects multiple network boundaries, including traffic between cloud workloads and the Internet as well as east-west traffic involving VPC environments.

For Internet-facing assets, Cloud Firewall can inspect inbound and outbound traffic and apply access-control policies, DPI-based analysis, intrusion-prevention rules, and threat intelligence without requiring an organization to deploy and maintain a self-managed firewall appliance.

For private architectures, a VPC Firewall can inspect and control traffic traversing VPC boundaries through CEN or Express Connect. Access-control policies determine which traffic is permitted or blocked.

Simple Log Service can analyze network logs but does not itself enforce inline traffic filtering. Traffic Mirroring copies traffic to another inspection system and therefore requires additional tooling. Security Center focuses primarily on workload security posture, vulnerability management, malware protection, and host security rather than functioning as the VPC ' s inline network firewall.

Cloud Firewall therefore most closely reproduces the company ' s former inspection-and-filtering architecture as a fully managed cloud-native service.

Study Guide reference: Securing Workloads on Alibaba Cloud — Cloud Firewall, network inspection, access control, IPS, and VPC security.

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Basic security groups support group-based authorization, allowing one security group ' s rules to reference another security group rather than requiring administrators to maintain long lists of individual IP addresses. Alibaba Cloud explicitly recommends source-security-group authorization for internal application communication because it is more manageable than maintaining individual private IP addresses or CIDR ranges.

This distinction is important because advanced security groups do not support another security group as an authorization object. Their primary benefit is higher private-IP capacity for very large deployments, not simplified service-to-service authorization.

For workloads residing in different VPCs, network connectivity must first exist through VPC Peering, Cloud Enterprise Network, PrivateLink, or another appropriate mechanism. Security groups do not themselves establish cross-VPC routes; they enforce authorization once the relevant network path exists.

Centralized logging provides visibility but does not simplify the actual authorization rules. Network ACLs operate at the vSwitch/subnet boundary and are less appropriate for application-tier identity based on security-group membership.

Thus, basic security groups with group-based authorization provide the intended simplified access-control model.

Study Guide reference: Securing Workloads on Alibaba Cloud — security groups, group-based authorization, least privilege, and VPC workload segmentation.

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