Refer to the graphic.

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for
this problem? (Choose two.)

A.
All of the routers need to be configured for backbone Area 1.

B.
R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.

C.
A static route has been configured from R1 to R3 and prevents the neighbor adjacency from
being established.

D.
The hello and dead interval timers are not set to the same values on R1 and R3.

E.
EIGRP is also configured on these routers with a lower administrative distance.

F.
R1 and R3 are configured in different areas.
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 2
10.4.4.4 10.4.4.4 776 0x80000004 0x005643 1
111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2
133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B
10.2.2.3 133.133.133.133 812 0x80000001 0x004BA9
10.4.4.1 111.111.111.111 755 0x80000001 0x007F16
10.4.4.3 133.133.133.133 775 0x80000001 0x00C31F

Explanation:
This question is to examine the conditions for OSPF to create neighborhood.
So as to make the two routers become neighbors, each router must be matched with the
following items:
1. The area ID and its types;
2. Hello and failure time interval timer;
3. OSPF Password (Optional);