Exam CISA topic 1 question 1103 discussion

A. Gateway. A gateway is a networking device that acts as an entry and exit point between two networks, such as a corporate or home network and the Internet. In this context, it typically connects the internal network to the Internet, obtains a public IP address from the Internet Service Provider (ISP), and then assigns private IP addresses to devices within the internal network using Network Address Translation (NAT) or Dynamic Host Configuration Protocol (DHCP). This allows devices within the internal network to communicate with each other and access the Internet using private IP addresses, while the gateway handles the translation between private and public IP addresses.

The device that sits on the perimeter of a corporate or home network, obtains a public IP address, and generates private IP addresses internally is a Router. Routers are networking devices that connect different networks together, such as a local area network (LAN) to the Internet. They typically perform network address translation (NAT), allowing multiple devices within the internal network to share a single public IP address while using private IP addresses internally. This helps manage the flow of traffic between the internal network and the external network, providing security and enabling communication between devices on the local network and the Internet.