Refer to the exhibit. What is the OSPF cost to reach the West LAN 172.16.2.0/24 from East?

Last Updated: May 8, 2026
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Refer to the exhibit. What is the OSPF cost to reach the West LAN 172.16.2.0/24 from East?​

  • 782
  • 74
  • 128
  • 65

Explanation: The OSPF cost for a route is the accumulated value of all outgoing interfaces from the source router to the destination network. To reach the West LAN (172.16.2.0/24) from the East router, the packet must exit two interfaces:

  1. The Serial interface on the East router connecting to West (1544 Kbps): By default, OSPF calculates the cost for a T1 link as 64.
  2. The GigabitEthernet 0/0 interface on the West router leading to the LAN: The default OSPF cost for a Gigabit Ethernet interface is 1.

Adding these together (64+1), the total cumulative cost is 65.

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