The Impact on Encrypted Signaling Traffic of a Collaboration Device Inside a Firewall with Private IP Addresses when Making an IP Call without Collaboration Infrastructure.
Question
What happens to the encrypted signaling traffic of a collaboration device if you place it inside a firewall with private IP addresses and try to make a call over IP without any collaboration infrastructure?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.B.
When a collaboration device is placed inside a firewall with private IP addresses and an attempt is made to make a call over IP without any collaboration infrastructure, the encrypted signaling traffic of the collaboration device encounters several potential issues:
Private IP Addresses: Private IP addresses are not publicly routable on the Internet. This means that they cannot be used to establish a direct connection with external endpoints.
Encryption: The signaling traffic of collaboration devices is typically encrypted to protect it from eavesdropping and tampering. Encryption makes it difficult for the firewall to inspect the traffic to determine its content.
Application Layer Gateway: Firewalls that are configured as application layer gateways (ALGs) can translate private IP addresses to public IP addresses and vice versa. However, this functionality is limited to certain protocols and may not be available for all collaboration devices.
With these potential issues in mind, let's examine each of the answer choices:
A. The signaling makes it back to the endpoint because the firewall is an application layer gateway and provides address translation.
This answer suggests that the firewall is configured as an ALG and is able to translate private IP addresses to public IP addresses. However, this is not always the case for all collaboration devices, and it is possible that the firewall may not support the necessary protocols or configuration options. Therefore, this answer is not a reliable explanation.
B. Encrypted IP traffic for collaboration devices always is trusted by the firewall.
This answer suggests that the firewall always trusts encrypted IP traffic for collaboration devices. However, this is not necessarily true, as firewalls may be configured to block or inspect encrypted traffic. Additionally, even if the firewall trusts the traffic, the private IP address of the collaboration device may still be an issue.
C. The signaling does not make it back to the endpoint because the firewall cannot inspect encrypted traffic.
This answer is a possible explanation. If the firewall is unable to inspect encrypted traffic, it may not be able to determine the destination of the signaling traffic, and the traffic may be dropped or blocked.
D. The signaling makes it back to the endpoint because the endpoint sent the private address to the external endpoint.
This answer suggests that the endpoint sent its private IP address to the external endpoint, which is unlikely because private IP addresses are not publicly routable. Even if the endpoint did send its private IP address, the external endpoint would not be able to establish a direct connection to the endpoint.
Therefore, the most likely correct answer is C: The signaling does not make it back to the endpoint because the firewall cannot inspect encrypted traffic.
