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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Correct Answer: C. Increase the NAT pool size to support 254 usable addresses. Explanation: This NAT config sets up dynamic NAT with route-map filtering. Here’s what’s happening: NAT Pool: ip nat pool Internet 10.10.10.1 10.10.10.100 defines a range of just 100 IPs. Access list + Route-map: The access list matches the entire 192.168.1.0/24 subnet (254 hosts). Mismatch Problem: You’ve got 254 internal hosts, but only 100 external IPs in the pool—some users won't get NATed if the pool runs out. Why the others are incorrect: A. NAT pools specify translated (public) addresses, not internal ranges. B. match-host isn't a NAT pool config—this is not relevant here. D. One-to-one NAT would require 254 public IPs—inefficient and unnecessary.
A. Incorrect, we need a public IP address in the external pool to access external networks. B. Incorrect, this will only work if the pool accommodates the entire host portion (192.168.1.1 - 192.168.1.253). D. Incorrect, this is static NAT, not dynamic NAT.
C. Increase the NAT pool size to support 254 usable addresses. This ensures that there are enough addresses in the NAT pool to accommodate all users from the 192.168.1.0/24 network.