To prevent external access, the technician should avoid exposing the surveillance system's port to the public internet. Port mapping (also known as port forwarding) is the method used to control which internal devices and ports are accessible from the outside. By not configuring port forwarding for the device, external login attempts are effectively blocked.
B). Subnetting organizes IP addresses but doesn ' t directly restrict access.
C). A static IP ensures consistent addressing but does not secure access.
D). Content filtering is used to restrict web content, not to block access to a web interface.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast security measures and tools.
Study Guide Section: SOHO router security - port forwarding and blocking external access

When an OS is no longer receiving updates, it is generally because it has reachedend of life (EOL), meaning the vendor has ceased support.
FromQuentin Docter - CompTIA A+ Complete Study Guide:
"End-of-life refers to the point when an OS vendor no longer issues updates or support. Systems at EOL pose security risks and must be upgraded or isolated."

Device encryptionensures that even if someone bypasses biometrics or has physical access to the phone, they cannot read the stored data without the encryption key.
FromQuentin Docter - CompTIA A+ Complete Study Guide:
"Encryption is the most effective way to protect data at rest. Even if the device is lost or stolen, encryption ensures the data remains inaccessible without the correct key or passcode."

See explanation below.
Explanation:
First Chat Response:When the user mentions setting up a new router, the best initial response to maintain a helpful and professional tone is:
>Select reply:"I am happy to assist you today."
Second Chat Response:When the user states that they need to set up basic security settings:
>Select reply:"Is this the first router in your office?"
Third Chat Response:After learning it's a replacement router and the user is logged into the router's web page:
>Select reply:"The first thing you need to do is change the default password." Fourth Chat Response:For the response about password settings:
>Select reply:"Create a new password with an uppercase, a lowercase, and a special character." Fifth Chat Response:When the router prompts to reboot:
>Select reply:"Yes, reboot please."
Study Guide Reference: The CompTIA A+ Core 2 guide highlights the importance of changing default credentials and using strong password policies, particularly in SOHO environments where routers are often targeted.

Once a malware incident has been confirmed, the immediate next step is to contain the threat. Quarantining infected systems prevents the malware from spreading to other devices and isolates the malicious code for further analysis or remediation.
B). Educating end users is important but occurs later in the incident response process.
C). Disabling System Restore is part of cleanup, not containment.
D). Updating and scanning should occur after the system is quarantined to prevent further infection or spread.
Reference:
CompTIA A+ 220-1102 Objective 2.5: Given a scenario, detect, remove, and prevent malware using appropriate tools and methods.
Study Guide Section: Malware removal best practices - Step 2: Quarantine the infected system