Cisco Certified Network Associate 0 (ccna)

Correct Answer: A
OSPF Configuration Sim


QUESTION 1
Guidelines
This is a lab item in which tasks will be performed on virtual devices.
+ Refer to the Tasks tab to view the tasks for this lab item.
+ Refer to the Topology tab to access the device console(s) and perform the tasks.
+ Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
+ All necessary preconfigurations have been applied.
+ Do not change the enable password or hostname for any device.
+ Save your configurations to NVRAM before moving to the next item.
+ Click Next at the bottom of the screen to submit this lab and move to the next question.
+ When Next is clicked, the lab closes and cannot be reopened. Topology

Tasks

IP connectivity between the three routers is configured. OSPF adjacencies must be established.

1. 
   Configure R1 and R2 Router IDs using the interface IP addresses from the link that is shared between them.
   
2. 
   Configure the R2 links with a max value facing R1 and R3. R2 must become the DR. R1 and R3 links facing R2 must remain with the default OSPF configuration for DR election. Verify the configuration after clearing the OSPF process.
   
3. 
   Using a host wildcard mask, configure all three routers to advertise their respective Loopback1 networks.
   
4. 
   Configure the link between R1 and R3 to disable their ability to add other OSPF routers.
   

A. Solution Task 1

R1(config)#router ospf 1
R1(config-router)#router-id 10.10.12.1

R2(config)#router ospf 1

R2(config-router)#router-id 10.10.12.2
Task 2 R2(config)#interface e0/0
R2(config-if)#ip ospf priority 255 R2(config-if)#interface e0/2 R2(config-if)#ip ospf priority 255 R2(config-if)#exit R2(config)#exit
R2#clear ip ospf process
R2#show ip ospf neighbor //check if R1 & R3 are not the DR R1,R3#show ip ospf neighbor //check if R2 is the DR

Task 3

This task requires to use “host wildcard mask” so we have to use “0.0.0.0” for the wildcard mask here. Notice that it is still correct and match the exact Loopback 1 IP addresses only.

R1(config)#router ospf 1

R1(config-router)#network 192.168.1.1 0.0.0.0 area 0

R2(config)#router ospf 1

R2(config-router)#network 192.168.2.2 0.0.0.0 area 0

R3(config)#router ospf 1

R3(config-router)#network 192.168.3.3 0.0.0.0 area 0

Task 4

Use these commands on both R1 & R3:

R1,R3(config)#interface e0/1 R1,R3(config)#ip ospf network point-to-point

Note: On point-to-point network, the DR/ BDR election process is unnecessary as there can only be two routers