Web Technologies Tutorial 10: E-commerce

False (B)

A node can take over a running application without user awareness.

<p>network</p> Signup and view all the answers

<p>Heartbeat Monitoring = A method to detect node failures. Load Sharing = Using multiple nodes to handle requests. Clustering = Independent nodes functioning as a single server. Availability Enhancement = Strategies to improve service uptime.</p> Signup and view all the answers

<p>Single node setup (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Additional hardware and software requirements.</p> Signup and view all the answers

<p>Mean Downtime (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Load sharing, clustering, fault tolerance, or virtualization</p> Signup and view all the answers

<p>load sharing</p> Signup and view all the answers

<p>Inability for the monitor to track appropriate responses (B)</p> Signup and view all the answers

<p>Load Sharing = Improves availability by distributing workloads Clustering = Connects multiple computers to work as a single system Fault Tolerance = Allows a system to continue operation even after a failure Virtualization = Creates virtual versions of physical components</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>To distribute incoming requests and monitor availability</p> Signup and view all the answers

<p>Increase availability through redundant nodes (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Server B starts its own copy of the application and continues processing requests.</p> Signup and view all the answers

<p>heartbeat</p> Signup and view all the answers

<p>Higher system administration tasks (A)</p> Signup and view all the answers

<p>Active-Passive = Only one node handles requests while the other is on standby. Active-Active = Both nodes actively process requests and share load. Heartbeat Monitoring = Process of checking the health of nodes in a cluster. Redundant Nodes = Backups of nodes to maintain availability should one fail.</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Dual network interfaces, special software, and system administration.</p> Signup and view all the answers

Total time a system is unavailable, regardless of the cause (corrective, preventative maintenance, or human error).

Availability measured by considering actual system downtime.

Availability estimate not considering system downtime for preventative actions.

A node can signal a problem to the monitor, or, if the monitor doesn't receive a heartbeat, it assumes the node has failed.

Distributing workload across several interconnected computers (nodes), improving availability.

Distributes incoming requests to multiple nodes (web servers) in a load sharing system and monitors availability.

A system for detecting node failures by checking if regular signals (heartbeats) are received from each server node.

Distributing workload across multiple nodes in a network to enhance performance and availability.

A group of web servers working together, employing load-sharing techniques for increased availability.

System designed so it can continue functioning even if one or more components fail.

Simple load sharing offers only limited improvements in availability because each node functions independently; a user connected to a failed node experiences zero availability.

A collection of nodes that act as a single server to the user. Tight integration allows one node to take over a running application without user notice.

An individual computer (like a web server) in a load-sharing system.

A system design that ensures continuous operation, minimizing downtime by allowing other nodes to take over when one fails.

Increasing the processing capacity of a system by adding more nodes.

Additional costs related to load sharing with heartbeat messaging, including dual network interfaces, a dedicated monitor computer, heartbeat software, and added system administration.

A cluster configuration where one node is actively handling requests (the 'active' node), while another node is in standby (the 'passive' node) ready to take over if the active node fails.

A cluster configuration where both nodes are active and concurrently handle requests. If one fails, the other takes over any lost workload.

A system designed to continue operating even if individual components fail, minimizing downtime.

Signals exchanged between nodes in a cluster to monitor each other's health and availability.

Extra server components in a cluster that can take over if a primary component fails.

Periods of time when a system or service is unavailable.

A component or system where a failure will cause the entire system to fail. This is to be avoided in clustering and fault-tolerant systems.