IT Communications Progress Test 1 Practice

NAT sits at the gateway between a private network and the Internet and translates private addresses to a public one, along with port numbers, so many internal hosts can share a single public IP. In peer-to-peer connections, direct reachability is usually required: each peer needs to be reachable at a known address and port. But NAT hides those private addresses behind the public IP, so other peers on the Internet can’t initiate connections to them directly. That makes end-to-end connectivity difficult, because the true locations of the peers aren’t visible, and inbound connections can be blocked unless port forwarding or traversal techniques are used. This is why the statement describing end-to-end connectivity being hard due to private addresses hidden behind a single public IP is the best fit. NAT doesn’t improve transparency, it often reduces it; it doesn’t remove the need for firewalls, and it doesn’t guarantee that peer-to-peer connections will always succeed.