Free CCNA | DHCP Snooping | Day 50 | CCNA 200-301 Complete Course

In Day 50 of this free CCNA 200-301 complete course, you will learn about DHCP snooping.

In this FREE and COMPLETE CCNA 200-301 course you will find lecture videos covering all topics in Cisco official exam topics list, end-of-video quizzes to test your knowledge, flashcards to review, and practice labs to get hands-on experience.
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0:00 Introduction
0:51 Things we'll cover
1:18 DHCP Snooping intro
4:40 DHCP Starvation attack
6:20 DHCP Poisoning attack
9:20 DHCP messages
10:45 DHCP Snooping operations
12:46 DHCP Snooping configuration
14:55 DHCP Snooping rate-limiting
17:27 DHCP Option 82 (Information Option)
20:28 Command review
20:38 Things we covered
21:45 Quiz 1
22:26 Quiz 2
22:51 Quiz 3
23:26 Quiz 4
24:10 Quiz 5
24:51 Boson ExSim

#cisco #CCNA

[lja]

If you're reading this, you've made it to day 50. You might be feeling burnt out, but you're so close so don't give up!!!

[kensrensen]

7:35
A common attack is to combine DHCP starvation with DHCP poisoning.
First, the attacker will send spoofed DHCP discover messages until the pool is completely drained. They will then pose as a DHCP server. This way they can guarantee that the clients will receive addressing from them.

[lemm]

passed my CCNA today. Thank you so much Jeremy for your free course!! It really helps me a lot understanding CCNA in depth. Hands down the best for me.

[mohitram]

Your content is one of THE BEST on CCNA out there...
BIG THANK YOU !! from INDIA for making these videos available to the public via youtube.

[matthewgraham]

Thanks Jeremy for the course. I passed my CCNA exam today thanks to this course. I really appreciate it. The course has been so well put together

[erikcarlin]

🎯 Key Takeaways for quick navigation:

00:00 *📚 Introduction to DHCP Snooping*
- DHCP snooping overview and its importance in network security.
- Exam topic coverage of DHCP snooping along with related topics such as port security and dynamic ARP inspection.
- Planned structure of the video covering the introduction, working principles, configuration, and examples of DHCP snooping.
01:28 *🎯 Understanding Trusted and Untrusted Ports*
- Explanation of trusted and untrusted ports on Cisco switches in the context of DHCP snooping.
- Identification of uplink and downlink ports and their configuration as trusted and untrusted respectively.
- Importance of distinguishing between ports for network security purposes.
03:23 *🔄 Examples of DHCP Snooping Operation*
- Demonstration of DHCP message forwarding and inspection process on both trusted and untrusted ports.
- Illustration of scenarios where DHCP snooping inspects or discards DHCP messages based on port trust levels.
- Understanding the behavior of switches in different DHCP message reception situations.
04:41 *🔒 Protection Against DHCP-Based Attacks*
- Overview of DHCP starvation and poisoning attacks and their potential impacts on network performance.
- Explanation of how DHCP snooping mitigates these attacks by filtering malicious DHCP messages.
- Understanding the role of DHCP snooping in ensuring network security against common DHCP-based threats.
09:15 *📩 DHCP Message Types and Filtering*
- Classification of DHCP messages into server and client types for filtering purposes.
- Explanation of how DHCP snooping distinguishes between server and client messages to decide their fate.
- Importance of understanding DHCP message types for effective DHCP snooping configuration.
12:55 *⚙️ DHCP Snooping Configuration on Switches*
- Step-by-step guide to configuring DHCP snooping globally and per VLAN on Cisco switches.
- Explanation of trusted port configuration and its significance in DHCP snooping operations.
- Understanding the DHCP snooping binding table and its role in DHCP message validation.
15:12 *📈 Rate-Limiting for DHCP Messages*
- Introduction to rate-limiting functionality in DHCP snooping to prevent network congestion and attacks.
- Configuration steps for implementing rate-limiting on switch interfaces to control DHCP message influx.
- Understanding the significance of rate-limiting in maintaining network stability and security.
17:26 *🛑 Handling DHCP Option 82 Issues*
- Explanation of DHCP Option 82 and its potential impact on DHCP snooping operations.
- Demonstration of how to disable Option 82 to resolve compatibility issues in DHCP snooping deployments.
- Importance of addressing Option 82 concerns for seamless DHCP snooping functionality.
20:39 *🎓 Recap and Quiz Review*
- Summary of DHCP snooping concepts covered in the video.
- Review of quiz questions to reinforce understanding of DHCP snooping principles and configurations.
- Preparation for bonus practice question from Boson Software’s ExSim for CCNA.

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[tg]

Thank you Jeremy for all your hard work. You are the GOAT in IT tutoring. God bless you.

[edsonpaz]

DHCP snooping had been difficult for me! But now it's all clear!!!! Thank you so much.

[imupotmyname]

This guy have put so much effort in this series, if i ever get to pass the test it would be thanks to ur videos, im gonna do the test by the end of August, Thank u and don't stop we're about to finish.

[cesarbrenner]

Excellence in the matter those are my words for you. Jeremy, you are a Genius to get so many knowledge of computer network.

[Saytono]

Thank you so much for this free CCNA courses.. it really helping me a lot to have a better understanding on each topic/lessons you teach. We really appreciate all the efforts you are putting onto it and keep it on and HOPEFULLY, I will pass my CCNA too. Will update you once I passed it 😁🤞

[kimosaid]

I'm in day 20 Thank You so much dear Jeremey

[enochliu]

The DHCPDECLINE message is only used when the server is being declined because the address is already in use, and can only be sent after a DHCPACK. The broadcasted request message being not targeted at your server is the implict offer decline message.

[sudipsen]

From Day 1 to Day 50. Its a long journey . I hope soon I will cover the rest of the playlist.

[clays]

Great Job Jeremy. Your doing awesome. Keep up the hard work and bright perspective in helping others!

[NohorellisMariaCR]

Best videos to prepare to CCNA, Thanks a lot!

[vhomotlatsi]

Highly recommend this series and thank you Jeremy for this course. It helped me to learn more and get CCNA certified.

[razaq]

It's overwhelming but indeed well structured and understanding, thanks jeremy

[juanmartinayonacarrera]

Hi Jeremy, I learning with your videos. Thank you and God bless you.

[BankiHorvathGyorgy]

Hi Jeremy, exciting stuff! I have just one question to the "rate limiting" as an efficient way to protect against starvation (17:04): When the attacker sends hundreds of DISCOVERs with a delay of 2 seconds between each message... then it can still exhaust the pool in a few minutes, can´t he? What is the default reservation timeout on the dhcp server after an OFFER, when no REQUEST follows?