Dynamic Routing Dynamic routing records all topology changes, updates automatically, and adjusts to changing networking conditions. Dynamic routing uses well-defined protocols such as OSPF internally or BGP between companies to exchange the routing information without ongoing administrative intervention. Internal routing methods used inside of a company’s network are referred to as Internal Gateway Protocols (IGPs) […]

Other Salesforce credentials in the Application Architect domain As you’ll know, there are several Salesforce certifications for each of the CTA domains. Looking at the Application Architect domain specifically, the following credentials comprise it: Figure 1.2 – The Application Architect domain You may already have some or all the other credentials in the Application Architect […]

Detecting a Disaster and Testing DR The first step, before you can take any countermeasures, is to detect that a disaster is actually taking place. Your recovery objectives (RTO and RPO) will dictate how much time you actually have to do so. Consider a situation where you have an RTO of 4 hours with an […]

Summarizing precision and recall Sometimes, you might want to use a metric that summarizes precision and recall, instead of prioritizing one over the other. Two very popular metrics can be used to summarize precision and recall: F1 score and Area Under Curve (AUC). The F1 score, also known as the F-measure, computes the harmonic mean […]

Note If you were trying to do this for a large number of instances in an automated fashion, then the best course of action would be to label those instances to get the CloudWatch agent with a particular tag and value – for example, CloudWatchAgent as the tag and the date as the value. This way, you […]

GENEVE The GENEVE protocol was covered in Chapter 4, “Load Balancing,” as part of the gateway load balancer. In this section, we will do a brief refresher of this standardized encapsulation protocol. The GENEVE protocol preserves the original packet by providing an encapsulation protocol that supports transparent routing. To make sure that the original packet […]

VPC Connectivity This section covers the following objective of Domain 5 (Networking and Content Delivery) from the official AWS Certified SysOps Administrator – Associate (SOA-C02) exam guide: 5.1 Implement networking features and connectivity CramSaver If you can correctly answer these questions before going through this section, save time by skimming the Exam Alerts in this […]

IPSec IPSec provides encapsulation of packets that are encrypted in transit between endpoint devices. IPSec is actually a family of protocols that work together for end-to-end encryption of data flows. IPSec will encrypt the packets and can authenticate the source of where the packets came from. It is the most common method used on networks […]

for Loop: The for loop is used to iterate over a range of values for a specified number of times. It is a procedural loop used to execute a block of code repeatedly for a predetermined number of iterations. for (Integer i = 0; i < 10; i++) { System.debug(‘The value of i is: ‘ […]

Elastic Network Interfaces An Elastic Network Interface (ENI) is a virtual network interface in a VPC. When EC2 instances are created in a VPC, they automatically get a default network interface (eth0). This interface cannot be detached from this instance. You can choose to have a public IP address automatically assigned to this interface. However, […]