Which method can be employed to enhance security on VSAT systems?

Frequency hopping is a technique used to enhance the security of VSAT (Very Small Aperture Terminal) systems by rapidly switching the transmission frequency among different channels during radio transmission. This method makes it difficult for potential eavesdroppers to intercept the communication, as they would need to be aware of the specific hopping pattern and timing to successfully listen in on the transmission.

By utilizing frequency hopping, VSAT systems can mitigate risks associated with static transmission frequencies that could be more easily targeted by adversaries. This technique strengthens the overall resilience of the communication link against jamming and interception attempts, making it a valuable security enhancement for satellite communications.

In contrast, the other options present methods that do not contribute positively to enhancing security. For example, using analog signals or unencrypted channels can actually expose data to interception and unauthorized access. Additionally, relying on a single fixed IP can create vulnerabilities, as static IP addresses can be targeted for attacks. Thus, frequency hopping stands out as a proactive measure to bolster the security of VSAT systems effectively.