Learning by Doing: CISCO Certified Network ... - SCN Research

Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 1ms, Average = 1ms
C:\WINDOWS\Desktop>
Supplemental Lab or Challenge Activity:
1. When do you think you might use loopback interfaces?
2. How many loopback interfaces can you have on a router?
3. Why do you think you can use any IP address? Can you use 0.0.0.0? What is the
upper and lower limit to loopback addresses?
So What Have I Learned Here?
In this lab you learned how to configure a loopback adapter. These are actually pretty
cool. If we configured an Ethernet interface then we would have to have a cable and a
switch or something to be able to ping it. A loopback is a virtual interface so no cable is
needed. Later on, when you get up in your studies you will learn many more uses for
loopbacks. Let’s add a protocol inspector to our RIP network and look at the packets!
Guest Router Name Derivation
In 1876 Alexander Graham Bell invented the telephone. Would you believe the first
“hackers” came along a couple of years after that in 1878? Those first “phreakers”
played pranks by switching calls to places they were not suppose to go, disconnecting
some calls, and other pranks. Yup…it’s been around for a while now.
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