Introduction to Wireless LAN

This topic is to discuss the following lesson::

Simple yet effective explanation.thanks.

  1. Can you plz tell me where does these Access Points connect in an enterprise network. what extra feature is required on Accesslayer switches so that can support these LWAPs?
  2. Do These APs connect via a physical cable to AccessLayer switches ?

thanks
Abhishek

Hello Abhishek

Let me answer your second question first: Yes, the APs connect via a physical cable to the Access Layer switches.

Concerning your first question, don’t confuse the terms ACCESS point and ACCESS layer switch. They have different meanings. An Access Layer switch is a switch that resides on the access layer of the three tier network design model: Core, Distribution and Access. The access layer of this model is the portion of the network that connects to the end devices such as phones, PCs, access points and so on. (For more information about the three tier network design model, take a look at this link: http://www.cisco.com/web/learning/netacad/demos/CCNP1v30/ch1/1_1_1/index.html)

The main purpose of the Access Layer switches as far as the access points are concerned is to provide network connectivity to the enterprise network. Additional features that these switches provide for the access points are:

  1. Power over Ethernet to power the access points via the Ethernet cabling, so no mains or power supply is needed where the APs are being installed.
  2. Separation of each SSID into a separate VLAN
  3. QoS and port security features.

For the most part, these additional features are available not only to Access points but to all devices connecting to the Access Layer switches.

I hope this has been helpful!

Laz

Hello Rene,

Could you please let me know what is your suggestion for a good book for wireless (Beginner to intermediate level)? Thanks in advance.

Hi Wisam,

I can highly recommend all the CWNP material. CWNA is the “beginners” material. Take a look at this book:

CWNA: Certified Wireless Network Administrator Official Study Guide

It’s vendor neutral and explains all the L1/L2 wireless stuff in detail.

Thanks Rene,
I got it 2 days ago and it’s really good book.

Thanks a lot again Rene!

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Good to hear you like it!

If you want to look at wireless frames, keep in mind that Wireshark on Windows doesn’t show 802.11 frames. Most windows drivers for wireless adapters don’t support “monitor mode”. If you want to look at 802.11 frames, the best thing to do is to download Kali and use one of the supported wireless adapters:

http://www.wirelesshack.org/best-kali-linux-compatible-usb-adapter-dongles-2016.html

These support client mode, monitor mode but also packet injection which is great if you are diving into WEP/WPA(2) security and other wireless attacks.

could it be provisioned in collapsed core model too ?

Hello Juan.

Yes it could. The underlying physical architecture of the wired network is for the most part independant from the creation of CAPWAP tunnels and the provisioning of LWAP devices. That is the case as long as the network has been configured appropriately for the amount of traffic that is expected. What’s important for the CAPWAP tunnels is that the VLANs are configured correctly in the network so that the tunnels can form.

I hope this has been helpful!

Laz

Hello,
I hope you are well.
Rene,
I would like to know what image you used to make the laboratories that involve not only the WLC but also the AP.
In the eve-ng emulator I can’t add an image to emulate the AP, how do I do it?
Please help me.

Greetings,

Hello @nevescutambo ,

I used a physical WLC 2504 and physical AP for my examples. Cisco has a Cisco Virtual Wireless Controller but there aren’t any virtual APs.

Rene

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