Which statements are true regarding ICMP packets?

The statement that is true regarding ICMP packets is that ICMP provides hosts with information about network problems. This is the primary function of ICMP (Internet Control Message Protocol), which is used by network devices to send error messages and operational information indicating success or failure when communicating with another IP address.

For example, if a router cannot forward a packet to a selected destination address, it sends an ICMP message back to the source to inform it of the issue, such as "Destination Unreachable." This capability aids in diagnosing network health and diagnosing issues.

The other statements do not accurately reflect the nature and purpose of ICMP. ICMP does not guarantee datagram delivery; it is an integral part of the Internet Protocol suite but does not ensure that the packets (datagrams) sent will reach their destination. Instead, it works alongside other protocols to report back on delivery success or failure. Additionally, while ICMP messages are indeed encapsulated within IP datagrams, the encapsulation itself is a detail of how ICMP operates rather than a standalone feature showcasing its utility as a protocol.

Thus, the statement correctly highlights ICMP's role in providing diagnostic information about network problems, which is its essential function.