External Load Balancers External load balancing is determined by the VPC subnet the ELB is placed in. If you create an Internet-facing load balancer, a public IP address will be assigned to the load balancer node. External load balancers are accessible from the public Internet and will always have a public IP address assigned to […]

Security The application load balancer will terminate all encrypted TLS/SSL connections and allow end-to-end encryption between the client and target server. The incoming TLS session will be terminated on the ALB for inspection and processing. There will be a second connection created on the backend between the ALB and the target. In this case, the […]

Classic Load Balancing For completeness, and to avoid any confusion if you come across the classic load balancer (CLB), it will be briefly mentioned here. The classic load balancer was the first offering within the ELB family of load balancers from AWS. The CLB was deployed to balance EC2 instances before VPCs came into existence. […]

Application Load Balancing The application load balancer, or layer 7 load balancer, is a version 2 ELB that supports HTTP, HTTPS, and WebSocket protocols. It is important to remember that the ALB does not listen for other protocols such as VOIP, gaming, SSH, FTP, or any others. If you want to work with these protocols, […]

Network Load Balancing In the Open Systems Interconnection (OSI) model, layer 4 is the transport layer and primarily uses the UDP, TCP, or the SSL/TLS networking protocols. The layer 4 load balancers are in the network load balancer category and are known for their high connection rates, low latency, and overall high-performance characteristics. While you […]

THE AWS CERTIFIED ADVANCED NETWORKING – SPECIALTY EXAM OBJECTIVES COVERED IN THIS CHAPTER MAY INCLUDE, BUT ARE NOT LIMITED TO, THE FOLLOWING: Objective 1.3: Design solutions that integrate load balancing to meet high availability, scalability, and security requirements. Elastic Load Balancing In Chapter 1, “Edge Networking,” you learned that the Elastic Load Balancer (ELB) is […]

Review Questions The following questions are designed to test your understanding of this chapter’s material. For more information on how to obtain additional questions, please see this book’s introduction.

Exam Essentials Know the Route 53 console areas with a focus on hosted zones and routing records. Understand all of the traffic management options in Route 53 such as latency, multivalue, etc., and how they are used. Understand the concept of DNS zones and what information they contain. Know the difference between public and private […]

Resolver Endpoints Monitoring Data specific to the resolver endpoints is exported to and monitored by CloudWatch. The raw data is collected at 5-minute intervals; converted into readable, near real-time data; and displayed in dashboards and tables you create. You can use Amazon CloudWatch to monitor the number of DNS queries that are forwarded by Route […]

CloudWatch Logging CloudWatch is the primary AWS monitoring application and is rather extensive in its capabilities and feature sets. In the following sections, the various options available in CloudWatch for Route 53 metrics are explained. DNS Query Logging Query logging will provide you with detailed information on resolver queries to Route 53, which includes the […]