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OSPF 2

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This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of …

This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of the CCNA, nor is it a “braindump” of questions and answers.

I sincerely hope that this document provides some assistance and clarity in your studies.


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  • 1. How Neighbor Table is created ? S1 S0 KOL E0 - 192.168.4.0 S1 S0 HYD S0 S1 10.0.0.0 E0 E0 - 192.168.1.0 1.150 S0 CHE S1 BAN 11.0.0.0 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Neighbor ID Int Neighbor ID Int Neighbor ID Int 192.168.2.150 S0 192.168.1.150 S1 192.168.2.150 S1 192.168.4.150 S1 192.168.3.150 S0 192.168.4.150 S0 LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 1
  • 2. How Topology Table is created ? S1 S0 KOL E0 - 192.168.4.0 S1 S0 HYD S0 S1 10.0.0.0 S0 CHE S1 BAN 11.0.0.0 E0 E0 - 192.168.1.0 1.150 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Link ID Link ID Link ID 192.168.4.150 192.168.4.150 192.168.1.150 192.168.1.150 192.168.1.150 192.168.3.150 192.168.2.150 192.168.2.150 192.168.2.150 192.168.3.150 192.168.3.150 192.168.4.150 LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 2
  • 3. How Routing Information Table is created ? S1 Cost = 10 S0 Cost = 15 KOL E0 - 192.168.4.0 S1 S0 HYD Cost = 10 S1 10.0.0.0 S0 CHE S0 Cost = 10 S1 BAN 11.0.0.0 E0 E0 - 192.168.1.0 1.150 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Best path Best path Best path 192.168.2.0 = H  C 192.168.1.0 = C  H 192.168.1.0 = B  C  H 192.168.3.0 = H  C  B 192.168.3.0 = C  B 192.168.2.0 = B  C 192.168.4.0 = H  K 192.168.4.0 = C  H  K 192.168.4.0 = B  K LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 3
  • 4. If, Link goes down ? S1 S0 KOL E0 - 192.168.4.0 S1 S0 HYD E0 1.150 S0 S1 10.0.0.0 LAN - 192.168.1.0/24 S0 CHE E0 2.150 S1 BAN 11.0.0.0 LAN - 192.168.2.0/24 E0 3.150 LAN - 192.168.3.0/24 4
  • 5. Effect on Neighbor Table ? S1 S0 KOL E0 - 192.168.4.0 S1 S0 HYD S0 S1 10.0.0.0 E0 E0 - 192.168.1.0 1.150 S0 CHE S1 BAN 11.0.0.0 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Neighbor ID Int Neighbor ID Int Neighbor ID Int 192.168.2.150 S0 192.168.1.150 S1 192.168.2.150 S1 192.168.4.150 S1 192.168.3.150 S0 192.168.4.150 S0 LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 5
  • 6. Effect on Topology Table ? S1 S0 KOL E0 - 192.168.4.0 S1 S0 HYD S0 S1 10.0.0.0 S0 CHE S1 BAN 11.0.0.0 E0 E0 - 192.168.1.0 1.150 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Link ID Link ID Link ID 192.168.4.150 192.168.4.150 192.168.4.150 192.168.1.150 192.168.1.150 192.168.3.150 192.168.2.150 192.168.2.150 192.168.2.150 192.168.3.150 192.168.3.150 192.168.1.150 LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 6
  • 7. Effect on Routing Information Table ? S1 Cost = 10 S0 Cost = 15 KOL E0 - 192.168.4.0 S1 S0 HYD Cost = 10 S1 10.0.0.0 S0 CHE S0 Cost = 10 S1 BAN 11.0.0.0 E0 E0 - 192.168.1.0 1.150 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Best path Best path Best path 192.168.2.0 = H  C 192.168.1.0 = C  H 192.168.1.0 = B  C  H 192.168.1.0 = B  C  H 192.168.3.0 = H  C  B 192.168.3.0 = C  B 192.168.2.0 = B  C 192.168.4.0 = H  K 192.168.4.0 = C  H  K 192.168.4.0 = B  K LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 7
  • 8. Effect on Routing Information Table ? S1 Cost = 10 S0 Cost = 15 KOL E0 - 192.168.4.0 S1 S0 HYD Cost = 10 S1 10.0.0.0 S0 CHE S0 Cost = 10 S1 BAN 11.0.0.0 E0 E0 - 192.168.1.0 1.150 E0 E0 - 192.168.2.0 2.150 E0 E0 - 192.168.3.0 3.150 Best path Best path Best path 192.168.2.0 = HKBC 192.168.1.0 = CBKH 192.168.1.0 = B  K  H 192.168.3.0 = H  K  B 192.168.3.0 = C  B 192.168.2.0 = B  C 192.168.4.0 = H  K 192.168.4.0 = C  B  K 192.168.4.0 = B  K LAN - 192.168.1.0/24 LAN - 192.168.2.0/24 LAN - 192.168.3.0/24 8