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Question ID 18371

You have been asked to evaluate how EIGRP is functioning in a customer network.

Traffic from R1 to R61 s Loopback address is load shared between R1-R2-R4-R6 and R1-
R3-R5-R6 paths. What is the ratio of traffic over each path?

Option A

1:1

Option B

1:5

Option C

6:8

Option D

19:80

Correct Answer D
Explanation


Question ID 18372

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 :

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. Seattles 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 1s, Host Bits 0s) 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 Chicagos 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 dont want to send external routes. And if we dont 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

Correct Answer A
Explanation

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