End-of-life documentation indicates the support status of a device, including whether updates and patches are still being released by the vendor.

The correct answer is B. PAT . Port Address Translation allows many internal devices that use private IP addresses to share a small number of public IP addresses when accessing the internet. In this case, the question says all users can access the internet using only two public IPs , which is exactly the kind of situation PAT is designed for. The device performing PAT keeps track of each connection by using source port numbers, so multiple internal sessions can be translated and maintained at the same time without requiring a unique public IP for every user.
The other options do not match this function. EIGRP and BGP are routing protocols used to exchange routing information, not to translate addresses for outbound internet traffic. VIP refers to a virtual IP address, commonly used in high availability or load-balancing scenarios, but it does not provide the many-to-one address translation behavior described in the question.
For Network+ exam purposes, when the scenario talks about conserving public IPv4 addresses and allowing many users to reach external networks through a very small number of public IPs, the expected answer is PAT
. This is one of the most common real-world uses of NAT technology at the network edge.

Using a /30 subnet mask is the most efficient way to conserve IP space for a point-to-point connection between two routers. A /30 subnet provides four IP addresses, two of which can be assigned to the router interfaces, one for the network address, and one for the broadcast address. This makes it ideal for point-to-point links where only two usable IP addresses are needed.
Reference: CompTIA Network+ study materials and subnetting principles.

MAC filtering is the simplest way to control wireless access making it the easiest NAC method to implement in a wireless environment.