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JN0-694 · Question #38

Referring to the exhibit, why are the OSPF routes missing from the routing table for this router? user@router> show ospf database Area 0.0.0.1 Type ID Adv Rtr Seq Age Opt Cksum Len Router…

The correct answer is A. mismatching OSPF interface type with the neighbor. See the full explanation below for the reasoning.

Question

Referring to the exhibit, why are the OSPF routes missing from the routing table for this router? user@router> show ospf database Area 0.0.0.1 Type ID Adv Rtr Seq Age Opt Cksum Len Router 172.24.255.1 172.24.255.1 0x800000d4 182 0x22 0x59f3 36 Router 172.24.255.2 172.24.255.2 0x800000d4 177 0x22 0x57f2 36 Router *172.24.255.4 172.24.255.4 0x800000dc 176 0x22 0x75fa 72 Network 172.24.124.2 172.24.255.2 0x80000007 177 0x22 0x7957 36 Summary 172.24.13.0 172.24.255.1 0x80000004 2370 0x22 0x3f62 28 Summary 172.24.23.0 172.24.255.1 0x80000002 471 0x22 0xdeb9 28 Summary 172.24.255.1 172.24.255.1 0x800000cb 2037 0x22 0x2bbb 28 Summary 172.24.255.2 172.24.255.2 0x800000cc 487 0x22 0x19ca 28 Summary 172.24.255.3 172.24.255.1 0x80000003 140 0x22 0xb2f9 28 OSPF AS SCOPE link state database Type ID Adv Rtr Seq Age Opt Cksum Len Extern *1.47.82.0 172.24.255.4 0x80000002 1037 0x22 0x4225 36 Extern *100.0.0.0 172.24.255.4 0x80000001 2643 0x22 0xfc88 36 user@router> show ospf neighbor Address Interface State ID Pri Dead 172.24.124.2 ge-0/0/1.0 Full 172.24.255.2 128 36 172.24.124.1 ge-0/0/1.0 Full 172.24.255.1 128 30 user@router> show ospf interface ge-0/0/1.0 extensive Interface State Area DR ID BDR ID Nbrs ge-0/0/1.0 PtToPt 0.0.0.1 0.0.0.0 0.0.0.0 2 Type: P2MP, Address: 172.24.124.4, Mask: 255.255.255.0, MTU: 1500, Cost: 1 Adj count: 2 Hello: 10, DeaD. 40, ReXmit: 5, Not Stub Auth type: None Protection type: None Topology default (ID 0) -> Cost: 1 user@router> show route protocol ospf table inet.0 inet.0: 11133 destinations, 11135 routes (11133 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 224.0.0.5/32 *[OSPF/10] 1w0d 00:01:14, metric 1 MultiRecv

Options

  • Amismatching OSPF interface type with the neighbor
  • BMTU mismatch with the neighbor
  • Cincorrect IP address configured on the interface
  • Dno Type 4 LSAs in the OSPF database

How the community answered

(29 responses)
  • A
    79% (23)
  • B
    14% (4)
  • C
    3% (1)
  • D
    3% (1)

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Full JN0-694 Practice