DCENT Networking

In Cisco ACI, there are three ways to advertise a bridge domain subnet. Note that in all cases you need to mark the subnet as "Advertise Externally"

1. Associate a L3OUT in BD
In this way you can if a subnet is advertised to outside within each BD, however under the L3OUT you won't be able see what are the subnets you are advertising.

2. Add each subnet within the L3OUT External EPG and mark as "Export Route Control Subnet"
In this way L3OUT can decide which subnet it will advertise. The problem with this method is you won't be able to differenciate BD subnets and transit routes. Using a description may help there.

3. Use a route-map with the L3OUT
Gives better flexibility. But maintaing this configuration may be overwhelming depeding on you setup.

There is no recommendation to use which option. It is suggested that stick to only one of the given options.

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For a CISSP student, understanding due diligence and due care is crucial. They might seem interchangeable, but they represent distinct security practices:

Due Diligence
- Think "investigate before you act"
- Refers to the process of gathering information and taking steps to understand the risks involved in a situation before making a decision.
- In cybersecurity, this could involve:
Security assessments of new systems or vendors
Reviewing contracts for security clauses
Understanding legal and regulatory requirements

Example: A company considering using a cloud service provider would perform due diligence by evaluating their security practices, certifications, and potential vulnerabilities.

Due Care
- Think "acting with reasonable prudence"
- Represents the ongoing effort to take responsible actions to mitigate security risks.
- Involves following established security policies, procedures, and best practices.

Example: An employee practicing due care would keep their work computer password secure and avoid clicking on suspicious links in emails.

Here's an Analogy:
Imagine buying a house. Due diligence would be getting a home inspection to understand any potential problems. Due care would be locking the doors and windows before leaving for vacation.

Key Differences:
- Timing: Due diligence happens before an action, while due care is an ongoing practice.
- Focus: Due diligence focuses on understanding risks, while due care focuses on mitigating risks.
- Scope: Due diligence can be broad (e.g., evaluating a vendor), while due care is often specific to a particular task (e.g., handling sensitive data).

By understanding both due diligence and due care, CISSP professionals can make informed decisions and implement effective security practices.

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