Testing Connectivity

Question 1

ping

Answer 1

Sends ICMP packet across network

• 4: ipv4
• 6: ipv6
• c: packet count.

Question 2

traceroute

Answer 2

Listing of hops packet traversed to get to destination. Verify network routing and breaks in network communication. Default packets in ICMP. 
!N: network unreachable.
*: no response.
-T: Use TCP packets.
-6: in ipv6

Question 3

tracepath

Answer 3

UDP packet default modern. also tracepath6.

Question 4

netstat

Answer 4

Net-tools package. Displays network connection and state on system. View routing table.
Can show protocol, local host, foreign address, state.
-l: listen.
-p: PID
-r: get IP routing table.
-t: TCP
-u: UDP

Question 5

ss

Answer 5

Modern netstat equivalent. Does not show routing table. Mostly the same switches as netstat.