MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

26-16 Chapter 26 Implementing, Managing, and Troubleshooting Network Protocols and Services
3. Correct Answers: C
A. Incorrect: The only aspect of this scenario that is not compatible with ICS is the
public IP addressing. ICS can function only when the client computers on the LAN
receive dynamically assigned IP addresses from the ICS computer. In this scenario,
each of the 100 systems can reach the Internet directly, without requiring the assistance
of ICS.
B. Incorrect: ICS is intended for use with small home networks and cable modems.
However, in this scenario, the ISP is providing a block of four public IP addresses.
Each system has its own IP address, so ICS is not needed for the systems to provide
access.
C. Correct: ICS is the ideal method for providing all four systems in this scenario
with Internet access. The computer that is connected to the dial-up connection
must have ICS enabled. As soon as ICS is enabled, that system’s LAN connection
is assigned the private IP address 192.168.0.1. DHCP services are automatically initiated
to assign the other systems IP addresses in the range 192.168.0.2 through
192.168.0.254. The next time the client computers reboot, they retrieve a DHCPassigned
IP address from the ICS system. When the ICS system connects to the
Internet, it performs NAT services to provide all systems on the network with
Internet access.
D. Incorrect: This scenario is perfect for ICS, except for one major detail: ICS can
assign IP addresses to only 253 computers. ICS is intended to be used on small
networks and is not designed to provide Internet access for larger quantities of
computers. A more robust NAT/DHCP solution is required.