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The echo reply is a component of which protocol?
TCP
UDP
ICMP
HTTP
One of the simplest tests that a user may wish to perform is verifying that a remote system is up and running on the network. Such a test may be required when basic connectivity appears to be failing.
ICMP provides two query messages that work together to provide just this service. The ICMP Echo Request query message is a probe sent by a user to a destination system, which responds with an ICMP Echo Reply query message.
RFC 1122 states that “every host must implement an ICMP Echo server.” Since this service is mandatory, any user should be able to send an ICMP Echo Request to any host on the Internet and receive an ICMP Echo Reply message in return. However, this is not always the case, as firewalls may be blocking the packets (for security reasons), or the packets may simply fail to be delivered.
Source: https://www.oreilly.com/library/view/internet-core-protocols/1565925726/ch05s01s04s01.html
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