Which ports must be open for TCP Call Home?

The correct choice focuses on the essential ports required for TCP Call Home functionality to operate effectively. Port 22 is commonly used for secure shell (SSH) connections, allowing for secure remote management of devices, while port 25 is typically utilized for sending emails via the Simple Mail Transfer Protocol (SMTP). Port 443, on the other hand, is designated for HTTPS traffic, which is critical for secure communication over the internet.

In the context of TCP Call Home, which is a mechanism used by networking devices to initiate a secure outbound connection to a support server for diagnostic purposes, the combination of these ports ensures that the device can communicate securely and reliably, whether sending logs, alerts, or other critical information.

Other combinations listed do not meet the specific requirements for TCP Call Home. For example, ports like 80 (HTTP) and 8080 (alternate HTTP) provide non-secure channels, which may not be suitable for sensitive information exchanges. Similarly, while ports 500 and 4500 are utilized for IPsec (Internet Protocol Security) and may be important in other contexts, they are not directly applicable to TCP Call Home requirements. Thus, the necessity for secure and reliable communication via the specified ports in the correct option is key to ensuring the successful