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Refer to the exhibit. What is the cause of the communication failure between R1 and R4?
Correct Answer: C
The communication failure between R1 and R4 is caused by R4 denying ICMP. In the exhibit, it is shown that ICMP port unreachable received from 10.34.0.4 which indicates that R4 is configured to deny ICMP messages, leading to the communication failure. References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) study guide.