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New CCNA ICND OSPF Sim Questions.

 
 

Question

LTC Company has decided to network three locations to improve efficiency in inventory control. The routers have been named to reflect the location: Idaho, Cologne, and Manchester.
 
 
 
ICND OSPF Sim 

The necessary networking has been completed at each location, and the routers have been configured with single area OSPF as the routing protocol. The Idaho router was recently installed but connectivity is not complete because of incomplete routing tables. Identify and correct any problem you see in the configuration.

Note: The OSPF process must be configured to allow interfaces in specific subnets to participate in the routing process.

 
Answer with brief Explanation:
 
According to the question Idaho router was not properly configured, to view and amend the configuration. Click on PC-B to gain access to the command line interface (CLI) and use the show running-config command:
OSPF Sim Exam
From the output above, you can see that the ip address 192.168.100.0 and mask of 0.0.0.3 (wildcard of 255.255.255.252) which belongs to 192.168.155.0 to 192.168.155.3 subnet range.

Looking back at the se0 interface IP of the Idaho router, the wrong configuration of IP address 192.168.100.5 was assigned which does not belong to the correct subnet range. The OSPF updates failed to recognise the interface se0 of the Idaho router as a part of the area 0.

To find out the subnet range the interface se0 of the Idaho router belongs to, we have to refer back to VLSM or subnetting.

Remember the cram table, as I’ve always mentioned, take time to write it out before you begin your exam. At this stage we don’t need Nostradamus to tell us that during CCNA and ICND 1&2 exam, IP addressing, subnetting and VLSM is a must!

Here we go:

Idaho router

 IP address of Se0 interface: 192.168.155.5/30
 Each time you come across a /30, it means four bits were borrowed or the Increment of 4. refer to table below.
 

Bit borrowed                 1     2      3     4       5      6        7     8

Bit value                      128   64   32    16      8      4       2     1

Subnet mask                128 192  224   240  248   252  254  255

Subnet prefix / CIDR   /25   /26 /27    /28   /29   /30

 

So, Idaho interface se0 belongs to Network address 192.168.100.4

 First Address: 192.168.100.5
 Last Address: 192.168.100.6
 Broadcast address: 192.168.100.7
 
Use the following command on Idaho se0 interface:
 

Idaho#configure terminal
Idaho(config)#router ospf 2
Idaho(config-router)#no network 192.168.155.0 0.0.0.3 area 0  (this command removes the former configuration)
Idaho(config-router)#network 192.168.155.4 0.0.0.3 area 0
Idaho(config-router)#end
Idaho#copy running-config startup-config   (don’t forget this bit)

 Verify connectivity by pinging from Idaho router to Manchester router to make sure it works well.
 

Idaho#ping 192.168.34.1



 
 
 


 
 
 
 
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