The ping command is specifically designed to test network connectivity and reachability. Here's how

it works:

Echo Request: The ping command sends an ICMP (Internet Control Message Protocol) Echo Request

packet to a specified destination IP address or hostname.

Echo Response: If the target host is reachable, it will respond with an ICMP Echo Reply packet.

Analysis: The ping command measures the round-trip time (RTT) between the source and

destination. It also reports statistics like packet loss and response times.

Why other options are incorrect:

echo: In some command-line environments, the echo command is used to display text on the screen

and does not relate to network testing.

access: This is a general term and does not refer to a specific command for sending echo requests.

connect: Some tools use the connect command to establish a TCP connection to a remote host, but it

doesn't directly utilize ICMP echo packets like the ping command.

Reference:

ping (Wikipedia): https://en.wikipedia.org/wiki/Ping_(networking_utility)