Posts from ‘VLANs’

Dec
01

Catalyst switch port security is so often recommended. This is because of a couple of important points:

  • There are many attacks that are simple to carry out at Layer 2
  • There tends to be a gross lack of security at Layer 2
  • Port Security can guard against so many different types of attacks such as MAC flooding, MAC spoofing, and rouge DHCP and APs, just to name a few

I find when it comes to port security, however, many students cannot seem to remember two main points:

  1. What in the world is Sticky Learning and how does it work?
  2. What is the difference between the different violation modes and how can I remember them?

Sticky Learning

Sticky learning is a convenient way to set static MAC address mappings for MAC addresses that you allow on your network. What you do is confirm that the correct devices are connected. You then turn on sticky learning and the port security feature itself, for example:

switchport port-security maximum 2
switchport port-security mac-address sticky
switchport port-security

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Sep
01

Are you a CCNP or CCIE student looking to challenge your perfect knowledge of Catalyst switchport commands?

Take the latest SWITCH Command Recall exam by clicking the link below. Good luck – and let us know how you scored in the comments area of this post.

Remember to read, AND TYPE, very carefully! I failed my first attempt due to just plain sloppiness. :-(

SWITCH Command Recall Exam – L2/L3 Ports

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Aug
18

As you may have noticed, INE does a wide variety of training in the Cisco space.  :)     This blog post goes out to all those folks who have recently begun their Cisco training.

This month we delivered new live classes on CCNA and CCNP. We are excited for and encourage our students at every level in their journey.   In that light, we have gathered a collection of Videos Answers, targeted at the CCNA level, with a few topics leaking into security and CCNP.   These videos were primarily created as quick (under 10 minutes each) Video Answers to questions that various learners have had.

Take a look at the list of topics, and if there are 1 or 2 you feel you would benefit from, feel free to enjoy them.

Here are a few of the topics (in no particular order):

  • How the network statement really works in IOS
  • Setting up SSH
  • Initial commands for sanity sake
  • NAT with overload
  • Router on a stick
  • VRFs Continue Reading

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Oct
20

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Sep
24

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Aug
13

Here is the latest (and previous) lessons of our upcoming CCNA course. Enjoy!

Module 1 Lesson 1 Advanced Switching Technology

Module 1 Lesson 2 VLANs

Module 1 Lesson 3 VLAN Configuration

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May
13

One of the biggest challenges for CCNA students (not to mention other Certification levels) is mastering Spanning Tree Protocol (STP). And the bad news for students is the fact that you no longer must master one version, but three versions of this critical protocol. Here is a quick review of the Spanning Tree Versions you want to be well-versed in for the CCNA, and beyond.

802.1D

Classic Spanning Tree Protocol possesses a standard designation of 802.1D. You need to memorize these standard identifiers. For classic STP, just think Dog-gone Slow. The convergence delays the classic version can present are unacceptable for modern LAN uses of today, like the transmission of Voice and Video traffic. There is plenty of excellent documentation about Classic Spanning Tree Protocol out there, and that is really beneficial since most environments are still using this approach (as of the time of this writing of course). We need to study 802.1D very carefully and with intensity. This protocol prevents Layer 2 loops, and its operation is still at the heart of the enhanced versions.

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