Examining Load Balancers and Proxies

Question 1

What are load balancers used for on networks?

Answer 1

Distribute network or application traffic across multiple servers

Question 2

What is the purpose of traffic distribution?

Answer 2

Improves responsiveness

• Increases availability of applications
• Increases availability of websites
• Increases availability of databases

Question 3

What are some of the different types of load balancers?

Answer 3

Round Robin, Least connection, Weighted connection, IP hash, Application-aware

Question 4

What does the Round Robin load balancer do?

Answer 4

Distributes requests sequentially across a group of servers in a repeating pattern

Question 5

What is the Least connection load balancer used for?

Answer 5

Routes traffic to servers with the fewest active connections

Question 6

What is the purpose of the Weighted connection load balancer?

Answer 6

Assigns a weight to each server, with higher weight values indicating greater request capacity

Question 7

How does the IP hash load balancer function?

Answer 7

Uses the client’s IP address or an HTTP header value to determine which server receives the request

Question 8

What is an application-aware load balancer?

Answer 8

Makes routing decisions based on application-specific data such as HTTP headers, cookies, or data within the message content

Question 9

What are proxies?

Answer 9

An intermediary for incoming client requests for resources from other servers

Question 10

What is the purpose of proxies?

Answer 10

Provides caching services, reduces latency, implements cache control policies, provides security, and provides anonymization services

Question 11

What are some benefits of caching services provided by proxies?

Answer 11

Stores copies of frequently requested web resources and delivers cached resources directly

Question 12

How do proxies enhance security?

Answer 12

Acts as an intermediary, intercepting requests to external servers and filtering malicious traffic

Question 13

What are the different types of proxies?

Answer 13

Forward proxy, Reverse proxy, Transparent proxy, Web application proxies

Question 14

What does a Forward proxy do?

Answer 14

Sits between the client and the Internet to control and filter client requests

Question 15

What is the function of a Reverse proxy?

Answer 15

Sits in front of web servers, forwarding client requests to those web servers

Question 16

What distinguishes a Transparent proxy?

Answer 16

Intercepts communication at the network layer without requiring special client configuration

Question 17

What is the role of Web application proxies?

Answer 17

Sits in front of web servers, forwarding client requests to internal applications and providing security services