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Cisco Loopback Interfaces Tutorial



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In this tutorial, you’ll learn about loopback interfaces which are logical interfaces that allow you to assign an IP address to a router or a Layer 3 switch.

Visit https://www.flackbox.com/cisco-loopback-interfaces for the full blog post with text and screenshots.

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28 thoughts on “Cisco Loopback Interfaces Tutorial”

  • Thanks for this explanation! Very clear and easy to understand 🙂

  • Your explanation to topic, good for me get the concepts, good teacher

  • Thanks! It would help if you would highlight the stuff youre referring to.

  • Thank you sir, I finally got the point after so many years confused by this concept

  • Thank u, clearly and detailed. I've got a question 🙂, can we have loopback interface to be assigned an ip address via DHCP? if so what is the benefit…

  • Great video!!!
    I got a question, when/why would we assign the ip default route to a loopback ip of a neighbor router?

  • This was really awesome… Thanks for the detailed explanation…

  • I have a question, If you were using the physical interface on R1 instead of a loopback and the physical interface went down on R4 FE0/0, wouldn’t EIGRP fail over to the FE2/0 interface anyways even if a loopback wasn’t used on R1? Thanks

  • Thank you very much for valuable information 🙂

  • You're a fantastic teacher. Thank you for explaining these concepts so clearly and for providing a strong example!

  • Thank you. Needed to find out why we even use them You made it make so much sense!

  • Will this help from DDoss attacks ? And to do that I'd I follow your steps would it work ?

  • I bought your CCNA course from udemy and I'm so pumped! hopefully I can understand everything and pass the CCNA exam, also is there any way I can get like practice test to take before I take the CCNA exam?

  • Dear teacher that's great video. I have a questions and i would really appreciate if you can give some time and answer these questions .
    1)Can we assign an ip address to loopback interface other than /32 let say from the network 192.168.5.232/30 . If so can we assign any one 4 addresses available in this subnet including net id and broadcast id?
    2. Can we assign multiple ip addresses to a same loopback interface if so why will we do this? Thanks

  • Excellent Teaching. Making base and then explaination… i just wanna suggest you to keep following initial Topology Diagram. so learner can remind it while configuration of topology. Rest is Great. thumbs Up 10/10

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