Firewalls

Correct Answer: Implementing a VPN

The best way to protect data transfer between two offices is by implementing a VPN. A Virtual Private Network (VPN) creates an encrypted connection over a less secure network, such as the internet. The data transmitted through this connection is protected from unauthorized access. Configuring DMZ (Demilitarized Zone) would not directly protect the data transfer between two offices, it is used to add an additional layer of security to an organization's Local Area Network (LAN). Enabling SPI (Stateful Packet Inspection) is a firewall security feature that checks the state of active connections, but it does not encrypt or protect the data itself during transfer. Finally, blocking all traffic would not meet the business requirement of enabling data transfer between two offices, because it would prevent all data transfers.

Correct Answer: Outbound access rule

The best rule to implement is the 'Outbound access rule’. This type of rule controls outbound traffic from the internal network to the external network, which is the scenario described in the question. It will restrict internal users from accessing external websites. On the other hand, 'Inbound access rule' controls inbound traffic from the external network to the internal network and does not impact the internal users' ability to access external websites. 'Stateful inspection rule' and 'Packet filtering rule' are also types of firewall rules, but they control traffic based on the state of connections and packet attributes respectively, not the specific direction of traffic as required in the question's scenario.

Correct Answer: Adaptive firewall

An adaptive firewall can identify abnormal traffic behavior and adjust its rules to respond dynamically, providing more effective protection for the network. Other firewalls do not have this adaptive behavior capability.