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MicroNuggets a Plenty!

CBTNuggets latest idea to love the world and spread the word has been a catalog of FREE MicroNuggets! These are really fun to make, but frankly, I'm out of ideas. I need ideas for Cisco concepts / configurations that I can cover in 5 minutes or so. I've been in Cisco so long that I miss a lot of the basic concepts that are difficult for folks to understand. Anyone have some thoughts or suggestions?

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Configuring a switch to use

Configuring a switch to use RADIUS authentication for management. That's something that I've always wanted to know.

STP, VTP, Initial Router

STP, VTP, Initial Router Configuration, Cables, Troubleshooting, etc, etc,

Troubleshooting with Wireshark

Hi Jeremy,
How about some quick tips using Wireshark to troubleshoot slow network connections, dropped packets, error messages, etc? Some things to look for, how to use the filters?

Ill second that Wireshark

Ill second that Wireshark idea! :)

Oh yeah, that would be awesome!

Wireshark can always help!

Or TCL scripting, you can do a lot of quick and easy scripts to do all sorts of things, but people seem intimated by them


Great idea... I'll "third" that!

Honestly I am not sure if

Honestly I am not sure if someone is able to cover Wireshark "in a quick fashion", there is whole 4-semester Wireshark University course on packet analysis. Not to mention first you need to have deep understanding of protocols themselves if you want to troubleshoot. Just TCP section itself is pretty huge. Hard to explain what are retransmits vs. fast retransmits statistics in 5 minutes before going into nitty gritty details about TCP itself in previous 60 minutes.


Hi Jeremy

I have viewed almost every nugget prepared by you and love you so much for them.
In my opinion, the best that can be covered in micro-nuggets of around 5-6 min is "Scenario based solutions".

Warm regards

MSTP basics & configuring

MSTP basics & configuring


How about:
- ACL's / Prefix Lists
- Redistribution / Route Summarization
- Telnet / SSH + ACL
- Useful Debug Commands
- Archieve Options
- Router on a stick
- IP Helper-Address
- TFTP server

HTH :)



These are great - prefix lists are definitely a stumper when you first see them.

mk's picture

My suggestions:

I think you could focus on things that are confusing for people at the CCNA level:

- native vlan
- default vlan
- STP bridge election



Based on your feedback, I've created the following MicroNuggets:

-Configuring Standard ACLs
-Configuring Extended ACLs
-Cisco Router Setup
-Understanding the Native VLAN
-Configuring NAT on a Cisco Router

...and I've learned to talk much faster than normal. :)

They should be posted to the MicroNugget channel soon - keep the suggestions coming; these are GREAT!!!


If you're looking for concept/configuration, may I suggest monitoring Cisco routers and switches using SNMP, IP SLA, and Netflow?


Hi Jeremy,

May be you can do some micro nuggets on troubleshooting scenarios for basic concepts at CCNA and NP level. Take some technology commonly used and you can shoot a micro nugget as to how to debug and troubleshoot the common problems. It will be like FAQs. :)

Few practical things

Password recovery
Bootup process in terms of where router looks for IOS and config
Quick setup of DHCP
Back-to-back frame-relay setup
Which cable is used where in some neat visual (rollover, straight-through, crossover,setting interfaces up, turning MDI/X on/off)
Difference between clock-rate, speed and bandwidth
Difference between default gateway, default network, candidate default and gateway of last resort

win2008 connected to etherchannel

I've tried to setup an etherchannel to connect to virtual win2008 server in GNS3 and it gave me some trouble...
These are the results that i had, but its a real mess and i can't figure out why is this happening. It might be impossible to accomplish in gns3 or i'm missing something :)


config files and wireshark capture:

check it out, if you have time...

MPLS Concept

The theory behind MPLS (you wouldn't have time for the practice.

IEEE 802.1aq ( SPB ), TRILL, IS-IS, Cisco FabricPath

It would be nice to have some information about:

- IS-IS, and namely on which layer of the OSI model it operate's;
- IEEE 802.1aq, Shortest Path Bridging, how it works and what the differences are with TRILL or any STP;
- TRILL, Transparant Interconnection of Lots of Links, how does it work and why has cisco chosen it over SPB;
- Cisco's FabrikPath, what makes it great and most of all different then Junipers QFabric, Brocade VCE, Avaya VENA;

llmathenjwa's picture

how about scenarios

Hi Jeremy,

how about you you make micro nuggets about real world scenarios and/or expectations of different companies for instance should a company required a form of service like WEB_BASED VPN or Tunnels through Firewalls, how to add VOIP in different scenarios and of course troubleshooting of all these scenarios.

plus this will help us get more advanced in our skills and keep you on alert about what kind of issues any Network Engineer might face, frankly i would like to see what kind of troubleshooting or configurations CCIE's do on a daily basis so i am aware and might try such myself

VPN Techno

Will be nice to have some comparison btw different VPN techno provide by cisco : GET VPN, DVPN, use of IKE2....

real world interface errors


I was thinking it would be useful to inlcude a MicroNugget that shows the interface commands and go over the likely causes that cause any interface errors and basic suggestions as to how to troubleshoot these errors in a live network environment.

Troubleshooting Logic

How about "general troubleshooting logic". For example, how one would approach troubleshooting a network issue like in the Cisco online demo for TSHOOT. Or how to approach troublshooting a phone that won't register to CUCM, or a firewall transversal problem, etc..

EEM Script

Script writing on a router is something new to me. I'd like to learn how we can write the script from scretch, for example, to shutdown an interface or make it passive under OSPF when the physical circuit on an interface is intermittent. Then bring it back up when the circuit is stable within a specified duration.

Truncation; difference between MSS and MTU

Hi Jeremy,

Loved your CCNA course, helped me pass it on the first go.
You're definitely one of the best teachers I've ever had!

I was thinking, what about MSS and MTU, I don't really know the difference between the two, it has something to do with truncation but that wasn't really clear.

What about that as a micronugget?


- Michael (Netherlands)

Hi Jeremy, As people wrote

Hi Jeremy,

As people wrote ideas about TCL scripting I was thinking of something related ... shell/batch scripting for automatic delivery of commands to multiple devices. That would be really helpful.


Suggestions !

Hello Jeremy,

First of all, i wanna thank you for what u doing for the networking community.

My suggestion for a micronugget or maybe a whole nuggets in a ccna in a realworld will be how to intergate cisco devices in a monitoring system lik PRTG for example or an open source one( i know you love PRTG :) ).
Second to focus on troubleshouting tips in some micronuggets.
And finally to intergate some Wireshark tips in your nuggets especially for voice track.

It's a very important to troubleshoot because this is a daily task once you finish the installation.

Thanks in advance


Automation is coming to Cisco's World
A micronugget about onePK would be great or more nuggets. On what kind of devices you can run it? How it works? How to set it up? How to make our first "Hello World" script.

A good Pattern Matching discussion

I was just going through your CCNP TSHOOT course and got to pipe to include, and I had never realized that it actually matches patterns. Infact it matches patterns very similar to the way shell scripts match pattern; so, I had a litte fun with it.

Below is the most screwed up pattern match I could think of, and it works. The below output will match any valid IP address in your running config.

show run | include ([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-9])\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-9])\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-9])\.([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-9])

I know this is simple, but most people I know who script "SUCK" at pattern matching; so, I am assuming the same is true in the Cisco world.

Just and Additional FYI: You can read the man page on a Linux/UNIX system for KSH and figure out the above pattern.


Default Gateway info doesn't match what I got from Subnetting.

I type in the command line IFCONFIG at work.
I get for my host IP address.
I get as the mask.
I get for my default gateway.

First, it is not true that every IP address has a mask after it as was taught unless this mask applies to both IP addresses. I really don't know what the mask is for my default gateway.
Second, I thought the default gateway was the subnet address, or the router address for all the subnets. It looks more like a server address with a 4th octet of .1. I don't think any network address can have a .1.
Maybe a micronugget would explain this.


The range of the subnet is - ( being the subnet address and the broadcast address). All other IPs in the range are usable for hosts.

Your gateway took the first available IP and that was (the default gateway is the address to which all packets are being sent unless there is not a more specific route, in your case everything that is not destined for your LAN range , the one mentioned above, will go to the address of the default gateway). The default gateway is an actual device, usually a router, a L3 switch, a firewall or a server that can do routing for your network.

inspect and Fixup

Difference beween inspect and fixups

difference between Establsihed ACL And CBAC and Reflexive ACL

How to build a 'Base Config'

Hi Jeremy

How about a short video on what to include in a base config (or lab config) for a switch/router..

I know when I started out, learning all the small commands to put into my lab devices, to make working on them easier and less frustrating (Stuff like 'no ip domain lookup'), was confusing...

jimjim84's picture

Alex - Try this guide for


- Try this guide for now:

Wish the author continued and added the rest of the commands. But this can get you started.


What about handling multicast traffic, using IGMP, for both switch and routers ?

SSH Tunnelling

If you can make a micro nugget on how we can stop users using ssh tunnelling that will be a treat.


Cisco Licensing

Discuss Cisco Univeral Images and Licensing installs


Hi Jeremy,
Always want to see something new from you like:
- Brief on wireless technology (WLC, AP's, discovery, security options)
- Data center Nexus and MDS switches (what are they, where they are used)
- The license files for the new routers, where they are saved, how to get them, how can they be deleted

AAA or mixed vendor MST

I have always found that all curricula is very light on AAA in general especially deeper application.

How many of us don't really use accounting and authorisation properly in my view. How many actually understand its correct use and application in a production environment, other than cut and paste of what was already there.?


How to integrate Cisco with other vendors at layer 2 in mixed scenarios. Have you ever migrated from a MST environment to PVST+, its all good fun.

Dr. Radut | blog