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| Question ID 6456 | Why do large OSPF networks use a hierarchical design? (Choose three.)
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| Option A | to decrease latency by increasing bandwidth
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| Option B | to reduce routing overhead
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| Option C | to speed up convergence
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| Option D | . to confine network instability to single areas of the network
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| Option E | to reduce the complexity of router configuration
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| Option F | to lower costs by replacing routers with distribution layer switches
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| Correct Answer | bcd |
Explanation OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. The hierarchical approach is used to achieve the following:
| Question ID 6457 | Which command is used to display the collection of OSPF link states?
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| Option A | show ip ospf link-state
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| Option B | show ip ospf lsa database
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| Option C | . show ip ospf neighbors
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| Option D | show ip ospf database
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| Correct Answer | d |
Explanation Explanation/Reference: The "show ip ospf database" command displays the link states. Here is an example: Here is the lsa database on R2. 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 count2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 210.4.4.4 10.4.4.4 776 0x80000004 0x005643 1111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B10.2.2.3 133.133.133.133 812 0x80000001 0x004BA910.4.4.1 111.111.111.111 755 0x80000001 0x007F1610.4.4.3 133.133.133.133 775 0x80000001 0x00C31F