Refer to the exhibit. A network engineer started to configure two directly-connected routers as shown. Which command sequence must the engineer configure on R2 so that the two routers become OSPF neighbors?
A.
interface GigabitEthernet0/1 ip ospf 1 area 1
B.
router ospf 1 network 192.168.12.1 0.0.0.0 area 1
C.
interface GigabitEthernet0/1 ip ospf 1 area 0
D.
router ospf 1 network 192.168.12.0 0.0.0.127 area 0
Single Area Deployment (No Backbone Needed):
Multi-Area OSPF: (Backbone Needed) area0
----
OSPF:
enabling OSPF directly under an interface using the "ip ospf 1 area 1" , advertise its own netwrok automatically, seperate network command not required. this matches area and process ID to form OSPF adjacency.
--
key point for forming OSPF Adjancency:
Process ID
Area ID
Hello and Dead timer
network type (Loopback, Broadcast, Point-to-Point, NBMA)
Authentication
** loop back and point-to-point doesnt elect DR/BDR.
OSPF will be enable if one of the interfaces of the router matches the address-range specified by the network area command
OSPF can be enabled by specifying the exact interface in 2 ways:
either by using IP OSPF <process-id> area <area-id> command on interface level
or
by using the IPV4 address of the interface with all zero Wild-card mask
------
router OSPF <process-id>
network <IPV4 address for the einterface> area <area-id>
------
The 2 neighbors must have the same area id
so option C & D are incorrect (area mismatch)
option B is incorrect since no interface in R2 matches the IP address 192.168.12.1, so OSPF won't be enabled
option A is correct (we can also write router OSPF 1 network 192.168.12.2 0.0.0.0)
OSPF will be enable if one of the interfaces of the router matches the address-range specified by the network area command
OSPF can be enabled by specifying the exact interface in 2 ways:
either by using IP OSPF <process-id> area <area-id> command on interface level
or
by using the IPV4 address of the interface with all zero Wild-card mask
------
router OSPF <process-id>
network <IPV4 address for the einterface> area <area-id>
------
The 2 neighbors must have the same area id
so option C & D are incorrect (area mismatch)
option B is incorrect since no interface in R2 matches the IP address 192.168.12.1, so OSPF won't be enabled
option A is correct (we can also write router OSPF 1 network 192.168.12.2 0.0.0.0)
If option B is 'network 192.168.12.2 0.0.0.0 area 1', they will form a neighborship. The catch is that 192.168.12.1 doesn't match the IP of the int g0/1 on R2. So A is correct.
A and C are literally contain incorrect syntax commands. The correct syntax is Router OSPF (Priority Number), followed by Network (IP Address) (Wildcard Mask) (Area ID). The answer D indicates that this is a point to multipoint connection but the exhibit shows that it is a point to point network. Therefore, B seems to be the correct answer. The wildcard subnet mask must be the same for the two routers to establish a neighbor adjacency.
you can configure ospf on the interface, and the area shown in the exhibit is 1, the command is (ip ospf process-id area area number) A is correct
B can't be correct, because ospf uses a wild mask so in B it represents a host ip address, which is not the same as the interface's.
it is possible to enable OSPF on an interface.
Ip address is already configured. So it is just needed to put the interfece in the same area as the neighbor.
A is correct.
B isn't correct, they won't become neighbors.
Not even to mention C and D which use different area.
A is the only answer that establishes neighbor relationship.
I agree, answer A is the only which makes sense, BUT the question is IF this cmd also enables the ospf proces. without ospf routing protocol enabled it won't work. But i just dig to deep..Definitely the A answer is the one which has no errors.
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