Load Balancers Flashcards
What are load balancers used for on networks?
Distribute network or application traffic across multiple servers
What are some of the different types of load balancers?
Round Robin - distributes requests sequentially across a group of servers in a repeating pattern.
Least connection - routes traffic to servers with the fewest active connections, useful in situations where server load is not evenly distributed.
Weighted connection - a weight is assigned to each server, higher weight values indicating a greater request capacity
IP hash - This method uses the client’s IP address or an HTTP header value to determine which server receives the request, ensuring that users consistently connect to the same server.
Application-aware - makes routing decisions based on application-specific data such as HTTP headers, cookies, or data within the message content.
What are proxies?
An intermediary for incoming clients request for resources from other servers
What is the purpose of proxies?
Provides caching services
Stores copies of frequently requested web resources.
Delivers cached resources directly, with no need for external data fetching.
Reduces latency and bandwidth consumption
Implements cache control policies for storage management.
Provides security
Acts as an intermediary, intercepting requests to external servers.
Mitigates direct external attacks, filtering malicious traffic.
Enforces security policies like access control and content filtering.
Anonymization services
Makes requests on behalf of the client, exposing only the proxy’s IP address.
Useful in scenarios for bypassing geo-restrictions and maintaining privacy online.
What are different proxies types?
Forward proxy - sits between the client and the Internet to control and filter client requests, enhance security, or bypass restrictions.
Reverse proxy - sits in front of web servers, forwarding client requests to those web servers, used for load balancing or caching.
Transparent proxy - intercepts communication at the network layer, not requiring special client configuration.
Web application proxies - sit in front of web servers, forwarding client requests to internal applications for external use (on-premise to mobile, cloud, hybrid…etc. ), which is another purpose of proxies; also providing security services.
