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Question ID 9475

Route.com is a small IT corporation that is attempting to implement the network shown in the
exhibit. Currently the implementation is partially completed. OSPF has been configured on routers
Chicago and NewYork. The SO/O interface on Chicago and the SO/1 interface on NewYork are in
Area 0. The loopbackO interface on NewYork is in Area 1. However, they cannot ping from the
serial interface of the Seattle router to the loopback interface of the NewYork router. You have
been asked to complete the implementation to allow this ping.
ROUTE.com's corporate implementation guidelines require:
· The OSPF process ID for all routers must be 10.
· The routing protocol for each interface must be enabled under the routing process.
· The routing protocol must be enabled for each interface using the most specific wildcard mask
possible.
· The serial link between Seattle and Chicago must be in OSPF area 21.

· OSPF area 21 must not receive any inter-area or external routes.
Network Information
Seattle
S0/0 192.168.16.5/30 - Link between Seattle and Chicago
Secret Password: cisco
Chicago
S0/0 192.168.54.9/30 - Link between Chicago and NewYork

S0/1 192.168.16.6/30 - Link between Seattle and Chicago Secre
Password: cisco
NewYork
S0/1 192.168.54.10/30 - Link between Chicago and NewYork
Loopback0 172.16.189.189
Secret Password: cisco

Option A

Answer: Here is the solution below:
Explanation:
Note: In actual exam, the IP addressing, OSPF areas and process ID, and router hostnames may
change, but the overall solution is the same.
Seattle’s S0/0 IP Address is 192.168.16.5/30. So, we need to find the network address and

wildcard mask of 192.168.16.5/30 in order to configure the OSPF.
IP Address: 192.168.16.5 /30
Subnet Mask: 255.255.255.252
Here subtract 252 from 2565, 256-252 = 4, hence the subnets will increment by 4.
First, find the 4th octet of the Network Address:

The 4th octet of IP address (192.168.16.5) belongs to subnet 1 (4 to 7).
Network Address: 192.168.16.4
Broadcast Address: 192.168.16.7
Lets find the wildcard mask of /30.
Subnet Mask: (Network Bits – 1’s, Host Bits – 0’s)
Lets find the wildcard mask of /30:

Now we configure OSPF using process ID 10 (note the process ID may change to something else

in real exam).

Seattle>enable
Password:
Seattle#conf t
Seattle(config)#router ospf 10
Seattle(config-router)#network 192.168.16.4 0.0.0.3 area 21
One of the tasks states that area 21 should not receive any external or inter-area routes (except
the default route).
Seattle(config-router)#area 21 stub
Seattle(config-router)#end
Seattle#copy run start
Chicago Configuration:
Chicago>enable Password:
cisco Chicago#conf t
Chicago(config)#router
ospf 10
We need to add Chicago’s S0/1 interface to Area 21
Chicago(config-router)#network 192.168.16.4 0.0.0.3 area 21
Again, area 21 should not receive any external or inter-area routes (except the default route). In
order to accomplish this, we must stop LSA Type 5 if we don’t want to send external routes. And if
we don’t want to send inter-area routes, we have to stop LSA Type 3 and Type 4. Therefore we
want to configure area 21 as a totally stubby area.
Chicago(config-router)#area 21 stub no-summary
Chicago(config-router)#end
Chicago#copy run start
The other interface on the Chicago router is already configured correctly in this scenario, as well
as the New York router so there is nothing that needs to be done on that router.

Correct Answer A
Explanation


Question ID 9476

JS Industries has expanded their business with the addition of their first remote office. The remote
office router (R3) was previously configured and all corporate subnets were reachable from R3. JS
Industries is interested in using route summarization along with the EIGRP Stub Routing feature to
increase network stability while reducing the memory usage and bandwidth utilization to R3.
Another network professional was tasked with implementing this solution. However, in the process
of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been
lost.
Currently EIGRP is configured on all routers R2, R3, and R4 in the network. Your task is to
identify and resolve the cause of connectivity failure with the remote office router R3. Once the
issue has been resolved you should complete the task by configuring route summarization only to
the remote office router R3.
You have corrected the fault when pings from R2 to the R3 LAN interface are successful, and the
R3 IP routing table only contains 2 10.0.0.0 subnets.

% Some configuration options may have Changed
%LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to administratively dow
n %
LINK-3-UPDOWN: Interface FastEthernet0/0, Changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state t
Cr up
%LINK-3-UPDOWN: Interface Seria10/0, Changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Seria10/0, changed state to up
Press RETURN to get started!
R3>

Netuiallests
% Scme configuration options may have changed
%LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to administratively dow
%LINK-3-UPEOWN: Interface FastEthernet0/0, Changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed
state t Cr up
%LINK-3-UPDOWN: Interface Seria10/0, Changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Seria10/0, changed state
to up Press RETURN to get started!
R4>

 

Option A

Answer: Here are the solution as
below: Explanation:
First we have to figure out why R3 and R4 can not communicate with each other. Use the show
running-config command on router R3.

Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict
the router from sharing any of its routes with any other router in that EIGRP autonomous system.
This keyword will also prevent any type of route from being sent. Therefore we will remove this
command and replace it with the eigrp stub command:
R3# configure terminal R3(config)# router eigrp 123 R3(config-router)# no eigrp stub receive-only

R3(config-router)# eigrp stub

R3(config-router)# end
Now R3 will send updates containing its connected and summary routes to other routers. Notice
that the eigrp stub command equals to the eigrp stub connected summary because the connected
and summary options are enabled by default.
Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip
route command on R3 to view its routing table:

Because we want the routing table of R3 only have 2 subnets so we have to summary subnetworks
at the interface which is connected with R3, the s0/0 interface of R4.
There is one interesting thing about the output of the show ip route shown above: the 10.2.3.0/24,
which is a directly connected network of R3. We can’t get rid of it in the routing table no matter
what technique we use to summary the networks. Therefore, to make the routing table of R3 has
only 2 subnets we have to summary other subnets into one subnet.
In the output if we don’t see the summary line (like 10.0.0.0/8 is a summary...) then we should use
the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 so that all the ping can work
well.
In conclusion, we will use the ip summary-address eigrp 123 10.2.0.0 255.255.0.0 at the interface
s0/0 of R4 to summary.
R4> enable R4# conf t R4(config)# interface s0/0 R4(config-if)# ip summary-address eigrp 123 10.2.0.0 255.255.0.0
Now we jump back to R3 and use the show ip route command to verify the effect, the output is
shown below:

Note: Please notice that the IP addresses and the subnet masks in your real exam might be
different so you might use different ones to solve this question.
Just for your information, notice that if you use another network than 10.0.0.0/8 to summary, for
example, if you use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 you will
leave a /16 network in the output of the show ip route command.

But in your real exam, if you don’t see the line "10.0.0.0/8 is a summary, Null0" then you can
summarize using the network 10.2.0.0/16. This summarization is better because all the pings can
work well.
Finally don’t forget to use the copy run start command on routers R3 and R4 to save the
configurations. R3(config-if)# end
R3# copy run start R4(config-if)# end
R4# copy run start
If the “copy run start” command doesn’t work then use “write memory.”

Correct Answer A
Explanation

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