A … is often used with a … to hide the internal network’s IPaddress and present a single IP address (its own) to the outside world.24/30A … is often used with a … to hide the internal network’s IPaddress and present a single IP address (its own) to the outside world.router / switchhub / proxyproxy server / firewallIDS / DNS serverGiải thíchChọn đáp án C