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    Question

    ICMP sends “Destination Unreachable – Fragmentation

    Needed” when:
    A TTL expires Correct Answer Incorrect Answer
    B MTU is smaller and DF flag is set Correct Answer Incorrect Answer
    C Packet checksum fails Correct Answer Incorrect Answer
    D Port is closed Correct Answer Incorrect Answer
    E Router queue is full Correct Answer Incorrect Answer

    Solution

    If a router cannot fragment due to the DF (Don’t Fragment) bit, it sends ICMP error with required MTU.

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