Which feature is supported by EIGRP but is not supported by OSPF?

Question

Options

• Aequal-cost load balancing
• Broute filtering
• Cunequal-cost load balancing
• Droute summarization

• A
  5% (2)
• B
  3% (1)
• C
  90% (36)
• D
  3% (1)

Explanation

EIGRP vs. OSPF Load Balancing

Unequal-cost load balancing (C) is a distinctive feature exclusive to EIGRP, achieved through the variance command, which allows traffic to be distributed across paths with different metrics, as long as those paths meet the feasibility condition. OSPF, by contrast, can only perform equal-cost load balancing - it will only distribute traffic across paths that share the exact same metric.

Why the distractors are wrong:

• A (Equal-cost load balancing): Both EIGRP and OSPF support this feature, so it is not unique to EIGRP.
• B (Route filtering): Both protocols support route filtering using distribute-lists or prefix-lists, making this a shared capability.
• D (Route summarization): Both EIGRP and OSPF support manual route summarization, so this is also not exclusive to EIGRP.

Memory Tip: Think of EIGRP as the "flexible" routing protocol - the variance command is your clue. If you see unequal-cost load balancing on the exam, the answer is always EIGRP. No other IGP supports this feature, making it one of EIGRP's most tested distinguishing characteristics.

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