Include the output you saved in this exercise.
What will be an ideal response?
```
PING 10.0.1.12 (10.0.1.12) from 10.0.1.11 56(84) bytes of data.
64 bytes from 10.0.1.12: icmp_seq=1 ttl=64 time=0.411 ms
64 bytes from 10.0.1.12: icmp_seq=2 ttl=64 time=0.192 ms
64 bytes from 10.0.1.12: icmp_seq=3 ttl=64 time=0.191 ms
64 bytes from 10.0.1.12: icmp_seq=4 ttl=64 time=0.197 ms
64 bytes from 10.0.1.12: icmp_seq=5 ttl=64 time=0.227 ms
--- 10.0.1.12 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3997ms
rtt min/avg/max/mdev = 0.191/0.243/0.411/0.086 ms
```
Explain the difference between pinging the local Ethernet interface and the loopback interface.
Specifically, on PC1, what is the difference between typing ping 10.0.1.11 and ping
127.0.0.1. (This is a conceptual question on the role of the loopback interface. The response to
the ping command does not provide you with the answer to this question.)
? Sol:
```
PING 10.0.1.11 (10.0.1.11) from 10.0.1.12 56(84) bytes of data.
64 bytes from 10.0.1.11: icmp_seq=1 ttl=64 time=0.220 ms
64 bytes from 10.0.1.11: icmp_seq=2 ttl=64 time=0.192 ms
64 bytes from 10.0.1.11: icmp_seq=3 ttl=64 time=0.201 ms
9
64 bytes from 10.0.1.11: icmp_seq=4 ttl=64 time=0.202 ms
64 bytes from 10.0.1.11: icmp_seq=5 ttl=64 time=0.237 ms
--- 10.0.1.11 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4012ms
rtt min/avg/max/mdev = 0.192/0.210/0.237/0.020
```
```
PING 127.0.0.1 (127.0.0.1) from 127.0.0.1 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.044 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.040 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.036 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.044 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.041 ms
--- 127.0.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4012ms
rtt min/avg/max/mdev = 0.036/0.041/0.044/0.003 ms
```
The name PING 127.0.0.1 is derived from the computer command PING. PING is a command that is
used on computer networks to verify connections to other computers. A computer on the network is
identified by what is known as an IP address. However, there is one address that cannot be used by any
computer in the world is 127.0.0.1, since this address has been reserved as what is known as the loopback
address. A loopback address is an address that tells the computer not to test its connections to another
computer, but to test its own basic network setup. 127.0.0.1 is a Class A address. 10.0.1.12 is called the
Ethernet address or IP address. It is the address by which communicating computers recognize each other
when using the IP protocol.
When pinging 127.0.0.1 the IP layer knows it is a loopback interface, so the packet is directly forwarded
back to the IP layer
When pinging PC!’s own IP address the IP layer has to check with each interface to see if the destination
is one of its own address. If it is true the packet will be forwarded back to IP layer
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