HPE6-A73 Exam - Question 105

Question

Examine the network exhibit.

Examine Route r4's partial OSPF configuration:

router ospt 1

area 0

exit

interface vlan 100

ip ospf area 0

exit

interface vlan 40

ip ospf area 0

exit

interface 1/1/1

vlan access 100

mtu 9000

ip ospf heilo-interval 1

ip ospf dead-interval 4

ip ospf authentication simple-text

ip ospf authentication-key key 123

When executing the "show ip ospf neighbors" command, Router 4 is in a FULL state with Router 3 and Router 2, but a 2-WAY state with Routed.

What is causing the 2-WAY state with Router 1?

Examice · Accepted Answer

Router 4 and Router 1 are acting as DROTHERs. In OSPF (Open Shortest Path First) networks, the FULL state is typically achieved between the Designated Router (DR) and Backup Designated Router (BDR) with all other routers. DROTHERs, which are routers that are neither DR nor BDR, will only reach the 2-WAY state with each other. This explains why Router 4 forms a FULL state with Router 3 and Router 2 (potentially acting as DR and BDR) and only a 2-WAY state with Router 1, indicating that both are acting as DROTHERs.

SeidorBruno · Answer

Page 340 Study Guide:
The DR and BDR form a Full adjacency with all other routers.  Or you could say that all DROTHER routers from a full adjacency with the DR and BDR. DROTHER routes only reach the 2WAY state between each other.
[Aruba Networks]

spillo3000 · Answer

correct B - dr/bdr  + drother 2/wat is router 1

E_Nick · Answer

There is only a DR/BDR, so only two will be FULL

Redrum702 · Answer

A: During the 2-way state, OSPF routers exchange Hello packets and verify that they have bidirectional communication with each other. This state confirms that both routers are on the same subnet, have compatible OSPF parameters, and can establish a neighbor relationship.

johnhenri · Answer

INIT state if HELLO settings mismatched (like MTU size, timers, authentication method and key if used, ... ) so A, C & D are wrong
FULL state are between DR and BDR & 2WAY state for DRother so B is correct

HPE6-A73 Exam - Question 105

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