Exam 200-301 topic 1 question 891 discussion

wrong answer as area is 0… answer A is correct

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.

it´s A B has wrong IP Adress and wrong Wild Card

it´s A

b doesnt match ip address on r2

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)

The Area number must much between two sides.

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.

D is incorrect because of area mismatch

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.

Ignore my earlier comment. OSPF can be enabled on an interface, so the correct answer is A

Definitely B

A is correct.

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.

To configure ospf in the interface ip ospf process-id area area-id so A is correct