判断如何添加静态路由

QUESTION NO: 242
You are the network administrator for TestKing. TestKing consists of four divisions: Marketing, Sales,
Finance, and Corporate. You divide your network into four subnets, one for each division. These subnets
are connected by three Windows 2000 Server computers, which are configured as network routers in a
default configuration. The relevant portion of your network configuration is shown in the following
diagram.

You need to enable all hosts on all subnets to communicate with each other. To accomplish this goal, you
plan to add one or more static route entries to one or more of your routers.
Which static route entry or entries should you add, and where?
To answer, click the Select and Place button, and then drag the correct route entry or entries to the
appropriate router or routers. Use the minimum number of necessary route entries and routers.




Explanation:
We must add a route for the 192.168.10.0/24 network to Router2.
If a client on the 192.168.10.0/24 subnet sends a packet to the 192.168.9.0/24 subnet, the packet will be sent to
Router1 which knows how to get to the 192.168.9.0/24 subnet because Router1 is directly connected to the
192.168.9.0/24 subnet.
If a client on the 192.168.10.0/24 subnet sends a packet to the 192.168.8.0/24 subnet, the packet will be sent to
Router1. Router1 doesn’t know how to get to the 192.168.8.0/24 subnet so Router1 will forward the packet to
it’s default gateway which is Router2. Router2 knows how to get to the 192.168.8.0/24 subnet because Router2
is directly connected to the 192.168.8.0/24 subnet.
A similar thing will happen when a client on the Corporate subnet sends a packet to the Finance subnet. The
problems will occur when a client on the Corporate subnet sends a packet to the Marketing subnet. If a client
on the Corporate subnet (192.168.7.0/24) sends a packet to the Marketing subnet (192.168.10.0/24), the packet
will be sent to Router3. Router3 doesn’t know how do get to the Marketing subnet, so Router3 sends the packet
to it’s default gateway which is Router2. Router2 doesn’t know how do get to the Marketing subnet, so Router2
sends the packet to it’s default gateway which is Router3. The packet will be bounced between Router2 and
Router3. Here we have a routing loop. To prevent this, we need to tell Router2 how to get to the Marketing
subnet (192.168.10.0/24).