The correct answer is C. To distribute incoming network traffic across multiple destinations.
A Load Balancer Service in an SDN environment is responsible for efficiently distributing network traffic across multiple servers or instances. This ensures high availability, reliability, and optimized resource usage.
Key Functions:
* Traffic Distribution: Balances incoming requests to various servers based on predefined algorithms (round-robin, least connections, etc.).
* High Availability: Prevents server overload and reduces downtime by distributing workload.
* Scalability: Automatically adjusts as the number of requests or available resources changes.
* Health Monitoring: Continually checks server availability and responsiveness to avoid directing traffic to non-responsive instances.
Why Other Options Are Incorrect:
* A. Isolated virtual networks: Creating isolated networks is a function of network virtualization, not load balancing.
* B. Monitor network performance: Monitoring is done by network monitoring tools, not load balancers.
* D. Encrypt data for secure transmission: Encryption is handled by security protocols like TLS/SSL, not load balancers.
Real-World Example:
Services like AWS Elastic Load Balancer (ELB) and Azure Load Balancer ensure that traffic is distributed efficiently across instances, maintaining performance and uptime.
References:
CSA Security Guidance v4.0, Domain 7: Infrastructure Security
Cloud Computing Security Risk Assessment (ENISA) - SDN and Load Balancing Cloud Controls Matrix (CCM) v3.0.1 - Network and Infrastructure Domains