A company that relies on an COL system must keep it operating until a new solution is available. Which of the following is the most secure way to meet this goal?

The correct answer is A. Isolating the system and enforcing firewall rules to allow access to only required endpoints. To ensure the most secure way of keeping a legacy system (COL) operating until a new solution is available, isolating the system and enforcing strict firewall rules is the best approach. This method minimizes the attack surface by restricting access to only the necessary…

Submitted by emma.c· Mar 6, 2026Security Engineering

Question

Options

AIsolating the system and enforcing firewall rules to allow access to only required endpoints
BEnforcing strong credentials and improving monitoring capabilities
CRestricting system access to perform necessary maintenance by the IT team
DPlacing the system in a screened subnet and blocking access from internal resources

How the community answered

(18 responses)

A
78% (14)
B
6% (1)
C
11% (2)
D
6% (1)

Explanation

To ensure the most secure way of keeping a legacy system (COL) operating until a new solution is available, isolating the system and enforcing strict firewall rules is the best approach. This method minimizes the attack surface by restricting access to only the necessary endpoints, thereby reducing the risk of unauthorized access and potential security breaches. Isolating the system ensures that it is not exposed to the broader network, while firewall rules control the traffic that can reach the system, providing a secure environment until a replacement is implemented.

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