Which statement about virtual links is false?

The assertion that the interval for sending Hello packets is 5 seconds is accurate in certain networking protocols, particularly in OSPF (Open Shortest Path First) configurations, where the default Hello interval is indeed set to 10 seconds for broadcast and point-to-point networks. While there are scenarios where a 5-second interval may be used, it is not universally applicable and is not the default configuration for every situation.

The other statements regarding virtual links hold true; they can create loops if not managed carefully, and they indeed add complexity to the network topology. Additionally, if virtual links are causing issues or dysfunction within the network, it signifies an optimization need, suggesting a requirement for network adjustments to ensure stability and efficiency.

Understanding these distinctions helps clarify the role and parameters of virtual links within networking configurations, especially in the context of protocols that manage them.