# Interview questions!

**URL:** https://forum.networklessons.com/t/interview-questions/3656
**Category:** General
**Created:** [April 23, 2018, 5:46am UTC](https://forum.networklessons.com/t/interview-questions/3656 "2018-04-23T05:46:03Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [April 24, 2018, 10:09am UTC](https://forum.networklessons.com/t/interview-questions/3656/2 "2018-04-24T10:09:24Z")

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Hello Pavithra,

You can find the explanations here:

- [OSI model](https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/introduction-to-the-osi-model/)
- For a detailed walkthrough of how packet goes from one device to another. Take a look at this post: [End-to-End Packet Delivery Explanation - #2 by ReneMolenaar](https://forum.networklessons.com/t/end-to-end-packet-delivery-explanation/3347/2)
- If you request hostnames like [facebook.com](http://facebook.com) or [youtube.com](http://youtube.com) then we use DNS which is [explained here](https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/introduction-to-dns/).
- Ping and traceroute are explained in the [ICMP lesson](https://networklessons.com/cisco/ccnp-route/icmp-internet-control-message-protocol/).

If you still have questions after going through these lessons, let us know ok?

Rene

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