Refer to the network diagram in the exhibit. Host A is configured with an incorrect default gateway. All other
computers and the Router are known to be configured correctly (Click the Exhibit(s) button.)

Which of the following statements is TRUE?

A.
Host C on Network A cannot communicate with Host A on Network A.

B.
Host A on Network A can communicate with all other hosts on Network A.

C.
Host A on Network A can communicate with Router R.

D.
Host C on Network A cannot communicate with Router R.

E.
Host D on Network B cannot communicate with Host B on Network A.

Explanation:
Host A on Network A can communicate with all other hosts on Network A and with Router R. To communicate
with local hosts and the interface of Router R (which are all in the same subnet) only a correct IP address is
reqired. If the default gateway of Host A is incorrect, then it will not be able to communicate with any host on the
other side of the router, which includes Network B in the diagram. Packets from hosts on Network B will reach
Host A on Network A without any problem, because they possess the correct address of the default gateway or
router, but Host A will send the packet to a dead end because Host A has an incorrect default gateway. On the
other hand, Host A does not require a default gateway to communicate with other hosts on same network.
Host C on Network A WILL be able to communicate with Host A on Network A , even though Host A has an
incorrect default gateway because Host A and C are in the same subnet, which requires no use of the of the
gateway or router..
Host C on Network A WILL be able to communicate with Router R because Host C has the correct default
gateway address which is the address of Router R.
Host D on Network B WILL be able to communicate with Host B on Network A because both hosts have a
correct default gateway address.
Objective:
Routing Fundamentals
Sub-Objective:
Troubleshoot basic Layer 3 end-to-end connectivity issuesReferences:
Cisco > Internetworking Technology Handbook > Internetworking Basics > Routing Basics
http://www.microsoft.com/technet/community/columns/cableguy/cg0903.mspx
http://kb.iu.edu/data/ajfx.html