Q20
Single choice
A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions:
1. A physical WAN solution is not available for most of the sites.
2. The customer has a limited budget and a short time frame for implementation.
3. The backup link will have low bandwidth requirements.
4. Users will tolerate a WAN outage of up to 2 hours.
Which backup WAN link type should the engineer recommend?