Routers R1 and R2 are being added to the network shown in the exhibit.

Last Updated on August 1, 2021 by Admin 1

Routers R1 and R2 are being added to the network shown in the exhibit.

300-410 Part 06 Q09 076
300-410 Part 06 Q09 076

The addresses of their respective interfaces have already been configured as follows:
R1: E0 192.168.4.5/30
R2: E0 192.168.4.6/30
R2: E1 192.168.72.6/30

You have been assigned to complete the following as a part of implementing OSPF area 5:
The E0 interface on R1 should be in area 5.
The E0 interface on R2 should be in area 5.
The mask used with the OSPF configuration should only include the addresses for R1 and R2.
Area 5 should not allow any external or inter-area routes (except for the default route).

Which commands are required to accomplish this set of requirements? (Choose all that apply.)

  • R1# configure terminal
    
    R1(config)# router OSPF 1
    
    R1(config-router)# network 192.168.4.4 0.0.0.3 area 5
    
    R1(config-router)# area 5 stub
    
    R1(config-router)# end
    
    R1# copy running-config startup-config
  • R1# configure terminal
    
    R1(config)# router OSPF 1
    
    R1(config-router)# network 192.168.4.4 0.0.0.3 area 5
    
    R1(config-router)# area 5 stub no-summary
    
    R1(config-router)# end
    
    R1#copy running-config startup-config
  • R1# configure terminal
    
    R1(config)# router OSPF 1
    
    R1(config-router)# network 192.168.4.4 0.0.0.4 area 5
    
    R1(config-router)# area 5 stub
    
    R1(config-router)# end
    
    R1# copy running-config startup-config
  • R2# configure terminal
    
    R2(config)# router OSPF 1
    
    R2(config-router)# network 192.168.4.4 0.0.0.3 area 5
    
    R2(config-router)# area 5 stub no-summary
    
    R2(config-router)# end
    
    R2# copy running-config startup-config
  • R2# configure terminal
    
    R2(config)# router OSPF 1
    
    R2(config-router)# network 192.168.4.4 0.0.0.3 area 0
    
    R2(config-router)# area 0 stub no-summary
    
    R2(config-router)# end
    
    R2# copy running-config startup-config
  • R2# configure terminal
    
    R2(config)# router OSPF 1
    
    R2(config-router)# network 192.168.4.4 0.0.0.3 area 5
    
    R2(config-router)# area 5 stub
    
    R2(config-router)# end
    
    R2# copy running-config startup-config
Explanation:
The following set of commands will configure R1 properly and satisfy the requirements:

R1# configure terminal
R1(config)# router OSPF 1
R1(config-router)# network 192.168.4.4 0.0.0.3 area 5
R1(config-router)# area 5 stub
R1(config-router)# end
R1# copy running-config startup-config

The configure terminal command enters global configuration mode, from which the router ospf 1 command can be executed to enable OSPF process 1. The network command allows the192.168.4.4/30 network to join OSPF area 5 and uses a wildcard mask (0.0.0.3) that only includes the E0 interfaces on R1 and R2. The area 5 stub command configures R1 as an internal router in a totally stubby area, which is necessary because no external or inter-area routes are allowed. The final two commands exit OSPF configuration mode and save the configuration.

The following set of commands will configure R2 properly and satisfy the requirements:

R2# configure terminal
R2(config)# router OSPF 1
R2(config-router)# network 192.168.4.4 0.0.0.3 area 5
R2(config-router)# area 5 stub no-summary
R2(config-router)# end
R2# copy running-config startup-config

The configure terminal command enters global configuration mode, from which the router ospf 1 command can be executed to enable OSPF process 1. The network command allows the192.168.4.4/30 network to join OSPF area 5, and uses a wildcard mask (0.0.0.3) that only includes the E0 interfaces on R1 and R2. The area 5 stub no-summary command configures R2 as an area border router (ABR) in a totally stubby area, which is necessary because no external or inter-area routes are allowed. The final two commands exit OSPF configuration mode and save the configuration.

The wildcard mask on both network statements, 0.0.0.3, is the wildcard equivalent of a 255.255.255.252 mask (/30). When used with the network address 192.168.4.4, this mask will only allow two addresses in the area, 192.168.4.5 and 192.168.4.6, as per the scenario requirements.

The command set that executes the area 5 stub no-summary command on router R1 is incorrect because R1 is an internal router and does not require the no-summary keyword. The no-summary keyword is only required on the ABR when configuring a totally stubby area.

The command set that executes the network 192.168.4.4 0.0.0.4 area 5 command on router R1 has the wrong wildcard mask.

The command set that executes the network 192.168.4.4 0.0.0.3 area 0 command on router R2 is incorrect because the area should be area 5, not area 0.

The command set that executes the area 5 stub command on router R2 is incorrect becauseR2 is an ABR router and requires the no-summary keyword when configuring a totally stubby area.

Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify network types, area types, and router types

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