CCSA R81 156-215.81 Updated Exam

The TCP/IP model is made up of four layers: Application, Transport, Internet, and Network Interface1, p. 10. The TCP/IP model is a simplified version of the OSI model, which has seven layers: Application, Presentation, Session, Transport, Network, Data Link, and Physical. References: Check Point CCSA - R81: Practice Test & Explanation, [TCP/IP Model Explained]

 To make John’s changes available to other administrators, and to save the database before installing a policy, John must publish the session. Publishing the session saves the changes to the database and makes them visible to other administrators1. The other options do not achieve this goal. References: Publishing a Session

The Transport layer of the TCP/IP model is responsible for managing the flow of data between two hosts to ensure that the packets are correctly assembled and delivered to the target application. It also provides error detection and correction, flow control, and multiplexing. The Transport layer uses protocols such as TCP and UDP.

References: Check Point Security Engineering Study Guide, p. 10-11

The main difference between Static NAT and Hide NAT is that Static NAT allows incoming and outgoing connections, while Hide NAT only allows outgoing connections4. Static NAT translates a single IP address to another single IP address, while Hide NAT translates a group of IP addresses to a single IP address. Static NAT is used to expose internal servers to external networks, while Hide NAT is used to hide internal hosts from external networks. References: Check Point R81 Firewall Administration Guide