pathping command 100% packet loss

Question

this is the real example of pathping command.

According to my knowledge:-

1. Source to here column :- it tells about number of packet loss out of 100 send directly to hop

2. Node/Link column. :- it tells about number of packet loss out of 100 which passed through this hop.

3. | :- tells about link congestion.

my doubt is in 2nd image how hop 4 how Node/Link column is 100% packet loss?

how is hop 5 getting ping packet if there is 100% loss in Node/Link column in hop 4?

I know for security reason some router don't respond to ICMP packet. So this is the reason for hop 4 Source to here column have 100% packet loss but why node/link column is not responding?

what if | (link congestion) is 100% what will happen?

Answer 1

You already know the answer:

I know for security reason some router don't respond to ICMP packet.

Please do not post images of text. copy and paste the text using the preformatted { } option.

Answer 2

Pathping uses incrementing TTL values to first probe a path and then pings (ICMP echo request) each of the path hops for a number of times.

If a hop doesn't respond to ping (100/100 lost) but hops beyond it are responding, then that hop forwards normally but doesn't respond to ICMP echo requests.

It's also quite possible that ping attempts on a hop show substantial loss with a (much) lower loss beyond the hop. That effect is due to ICMP rate limiting.