C is the correct answer
You can configure ospf two ways,
Under global config:
router osfp 1
network ip wildcard-mask >> Attached via Network Statement
Under interface:
inter gi0/2#ip ospf 1 area 0 >> Attached via Interface Enable
cisco_R3#show ip ospf interface ethernet 0/0.50
Ethernet0/0.50 is up, line protocol is up
Internet Address 10.111.10.1/30, Area 22, Attached via Interface Enable <<<<<<<<<<<<<
Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 5, maximum is 6
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 5.5.5.5
Suppress hello for 0 neighbor(s)
cisco_R3#
cisco_R3#show runn interface ethernet 0/0.50
Building configuration...
Current configuration : 176 bytes
!
interface Ethernet0/0.50
encapsulation dot1Q 50
ip address 10.111.10.1 255.255.255.252
standby 40 ip 10.111.10.254
ip ospf network point-to-point
ip ospf 1 area 22
end
cisco_R3#show runn | s ospf
router ospf 1
area 22 filter-list prefix PL_3 in
passive-interface default
no passive-interface Ethernet0/0.10
no passive-interface Ethernet0/0.50
network 0.0.0.0 255.255.255.255 area 0
cisco_R3#
cisco_R3#show runn interface ethernet 0/0.10
interface Ethernet0/0.10
description to_sw1
encapsulation dot1Q 10
ip address 192.168.255.3 255.255.255.0
end
cisco_R3#show ip ospf interface ethernet 0/0.10
Ethernet0/0.10 is up, line protocol is up
Internet Address 192.168.255.3/24, Area 0, Attached via Network Statement <<<<<<<<<<<<<<
Process ID 1, Router ID 3.3.3.3, Network Type BROADCAST, Cost: 10 <<<<<<<<<<<<
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 192.168.255.2, Interface address 192.168.255.2
Backup Designated router (ID) 3.3.3.3, Interface address 192.168.255.3
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:04
...
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 192.168.255.2 (Designated Router)
cisco_R3#
When you ue the "show ip ospf interface intx/x/x" command, what difference will you see in the old vs new OSPFv2 config?
- One will say attached via Interface Enable, the other will say Attached via Network Statement
https://www.chegg.com/flashcards/chapter-20-implementing-ospf-61b573b4-141b-4f63-bac9-ee35462d315e/deck
Once again a trick Q, or one based on other implied info.
I am guessing the only reason 'C' is wrong, is somewhere in this output is an indication that the interface has been 'up' for some time - so the 'no shutdown' command was not needed.....
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