Which of the following routing protocols is less prone to routing loops and network reachability issues when used in discontiguous networks?
  1. IGRP
  2. CDP
  3. OSPF
  4. RIPv1
Explanation
Answer: C - OSPF is less prone to routing loops and network reachability issues when used in discontiguous networks.

Key Takeaway: OSPF is the best protocol for discontiguous networks because each area in an OSPF has a collection of networks and OSPF attaches a mask to each advertisement. Hence, it is less prone to routing loops and network reachability issues.
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