CCIE Pursuit Blog

April 2, 2009

Core Knowledge Question of the Day: 02 April 2009

Which OSPF area will int fa0/0 be assigned:

interface FastEthernet0/0
ip address
ip ospf 100 area 12

Rack1R1(configr)#router ospf 100
Rack1R1(config-router)#network area 21
Rack1R1(config-router)#network area 2
Rack1R1(config-router)#network area 3
Rack1R1(config-router)#network area 4

Highlight for answer: Area 12


  1. Area 12, I think the interface level area commands take precedence.

    Comment by Ryan — April 2, 2009 @ 9:39 am | Reply

    • interface Serial0/3/0
      ip address
      ip ospf 1 area 5

      router ospf 1
      auto-cost reference-bandwidth 20000
      area 0 authentication message-digest
      redistribute eigrp 100 subnets route-map EIGRP->OSPF
      network area 0
      network area 0

      Summary Net Link States (Area 0)

      Link ID ADV Router Age Seq# Checksum 1044 0x80000024 0x006CB7 217 0x80000001 0x004CF2

      Rack1R1#s ip os int s0/3/0
      Serial0/3/0 is up, line protocol is up
      Internet Address, Area 5

      So, interface is king, followed by most specific.

      Comment by Ryan — April 2, 2009 @ 9:47 am | Reply

  2. Hey I really enjoy these questions… Keep them coming 🙂

    Comment by Andrew — April 2, 2009 @ 1:36 pm | Reply

  3. These core knowledge questions are awesome, sincerely appreciated, and are acting to dampen my fears of the open ended questions section. As others have stated, please keep them coming! 😀

    Comment by ElectricJaguar — April 2, 2009 @ 2:06 pm | Reply

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