Refer to the exhibit. An administrator troubleshoots intermittent connectivity from internal hosts to an external public server. Some internal hosts can connect to the server while others receive an ICMP Host Unreachable message, and these hosts change over time. What is the cause of this issue?
The issue arises because the NAT pool is not using address overloading. The NAT pool consists of just two IP addresses (198.51.100.5 and 198.51.100.6) and cannot handle all internal hosts needing to access the external server, leading to the exhaustion of the NAT pool as indicated by the error message 'NAT pool might be exhausted'. By enabling address overloading, many internal hosts could be mapped to a single or limited number of external IP addresses, thus resolving the intermittent connectivity issues.
Since only 2 NATs in pool, and more then 2 are needed. Then overloading may be the best NAT choice.
B is correct read the logs at the beginning NAT pool might be exhausted, in the example the way to fix it is with PAT A-doesn't matter C- the question mentioned "hosts changing over time" this eliminate C completely cause the example is not showing information about the ACL to refare to it D- not correct the pool is defined with start end IPs, mask doesn't matter here
the question is what's causing the problem based on the logs so the answer should be C.
My answer is B because it's not a solution, it's just a scenario that can be causing the problem. I'm not sure if you can tell from the logs what the NAT ACL is (please correct me if I'm wrong), but you CAN tell that the pool only allows for 2 NAT IP addresses: 198.51.100.5 and 198.51.100.6. Additionally, from the logs you can tell that the NAT Pool is exhausted and it's dropping ICMP polls from hosts that don't have a NAT mapping. Therefore, if you need more than 2 hosts to have access to the outside, you'd need more than the 2-IP NAT pool. "The NAT pool is too small" would be a fine answer if it was a choice, but the next best thing is to say the translation doesn't allow overloading, which would allow more hosts to be translated after the first 2 IPs in the pool are used up.
The question asks what is the cause and not what is the solution So I'd go with C as it does not match all internal hosts so also the extend of the pool is a solution as the mask of the pool is /24