Abstract
Cloud computing has a fundamental impact on information technology. It is a delivery model in which computing resources (such as computer networks, servers, storage, applications, and services) are made available as virtual resources in on-demanf manner. A major challenge for cloud computing suppliers is to provide adequate security levels to protect users' data. A lot of research has been carried out with this target. In this paper, we evaluated public cloud performance considering different security schemes of firewalls and VPNs c under four scenarios: no firewall no VPN, firewall-only, VPN-only and a combination of firewall and VPN. A simulated cloud model was created to evaluate the public cloud performance under the above scenarios. The results suggest that the cloud server throughput and point-to-point utilization are agnostic to the implemented security sheme. On the other hand, the queing delay is slightly affected when firewalls are used.