The value of the OSPF port cost is related to the bandwidth of the port. The calculation formula is bandwidth-reference/bandwidth. The cost is only calculated by OSPF itself and cannot be changed…

Question

Options

• ATRUE
• BFALSE

• A
  26% (17)
• B
  74% (48)

Explanation

Option B is correct because while the first part of the statement is true - OSPF does calculate interface cost using the formula reference-bandwidth / interface-bandwidth (default reference is 100 Mbps) - the second part is false: OSPF cost can be manually overridden. Administrators can set a custom cost per-interface using the ip ospf cost <value> command (Cisco IOS) or equivalent vendor syntax, which takes precedence over the automatically calculated value. Option A is wrong because it treats the entire compound statement as true, ignoring that the "cannot be changed manually" clause is incorrect.

Memory tip: Think of OSPF cost like a GPS route estimate - the system calculates it automatically based on speed, but you can always manually "override" the route. Any time an exam says a networking parameter "cannot be changed manually," treat that as a red flag and verify it carefully.

No community discussion yet for this question.