1. Suppose you purchase a wireless router and connect it to your cable modem. Also suppose that your ISP dynamically assigns your connected device (that is, your wireless router) one IP address. In addition, suppose that you have five PCs at home that use 802.11 to wirelessly connect to your wireless router. How are IP addresses assigned to the five PCs

In this example, the wireless router uses NAT to allocate private IP addresses to five PC's and router interface, since only one IP address is assigned or given to the wireless router by the ISP.

Explanation:

Solution

The Dynamic Host Configuration Protocol server provides the IP addresses to clients, dynamically.

Generally a wireless router contains DHCP server. a wireless router can also  assign IP addresses dynamically to its clients.

So, the wireless router assigns IP addresses to five PC's and the router interface dynamically using the DHCP.

It is stated that the Internet Service Provider (ISP) assigns only one IP address to the wireless router. Here there are five PC's and one router interface need to be allocated IP addresses.

In such cases the NAT (Network Address Translation)protocol is important and allows all the clients of the home network to sue a single internet connection (IP address) assigned or given by the ISP.

NAT permits the router to allocate the private IP addresses to client from the private IP address space reserved for the private networks. these private IP addresses are valid only in the home or local network .

i think the answer is b.