1. CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino
4/17/2017
Wireless Chapter 7
CCNA Exploration Semester 3
Modified by Profs. Ward
and Cappellino
S Ward Abingdon and Witney College

2. Topics Components and basic operation of wireless LANs
Basic WLAN security
Configure and verify basic wireless LAN access
Troubleshoot wireless client access

3. Semester 3 LAN Design Basic Switch Concepts Wireless- Chp 7 STP VLANs
Inter-VLAN routing
VTP

4. 4/17/2017
Wireless Review
Wireless was covered in CSN208, therefore, only new material will be presented here
Must have understanding of entire chapter
Please see me, the curriculum or the CSN208 text with questions
Review- what is an AP?
Review- what is a wireless NIC?
S Ward Abingdon and Witney College

5. Wireless router Acts as:
4/17/2017
Wireless router
Acts as:
Router for use in ___________________
Ethernet ______________ and
wireless __________________________
Configuration on both the ____________________ is necessary
Parameters:
Mode refers to the a, b, g, or n
Configure SSID – what is the SSID?
Select channel within 2.4GHz band
_________________________ should be set to use _____________________________-
S Ward Abingdon and Witney College

6. 4/17/2017
Channel Graph
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7. Different 802.11 Wireless Topologies…
Ad Hoc
Basis Service Set (BSS)
Extended Service Set (ESS)
More to come on each of these…

8. ______________ topology
4/17/2017
______________ topology
WLAN operating with _________________
_________________
Negotiate parameters
Independent basic service set
Area covered is basic service area (_____)
S Ward Abingdon and Witney College

9. __________________ topology
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__________________ topology
_________________
Access point _________ _______________________________________ for clients
Uses _________ mode
Area covered is basic service area (_______).
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10. ________________ topology
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________________ topology
________________________________________
Access point manages parameters for clients
__________ mode used
Area covered is extended service area (_____).
A common distribution system allows multiple access points in an ESS to appear to be a single BSS.
S Ward Abingdon and Witney College

11. Components continued on next slide…
4/17/2017
Beacon and probe
Discovering a WLAN and connecting to it involves the following components:
________ - _________ used by the WLAN networks to _____________________
Access point may send out a beacon at regular intervals for ________________________
_________ - Frames _____________________ ________________________
Client sends a probe specifying the _____________ supported. ________________________
Client can send probe with no SSID to look for any network. Access point may be configured to respond, or not.
Components continued on next slide…
S Ward Abingdon and Witney College

12. Components continued on next slide…
4/17/2017
Authentication
Components cont…
______________ One of three ___________ __________________________
__________________________
____________________________
had two authentication mechanisms.
________ (Open Authentication) does not give privacy
Wired Equivalency Protection (__________)
Newer and more secure authentication method: Wi-Fi Protected Access (_________)
Components continued on next slide…
S Ward Abingdon and Witney College

13. Association Components cont…
4/17/2017
Association
Components cont…
_______________ - The process for _________ ___________________________________________________________________
Request from client and response.
Finalizes __________________
Finalizes ____________________
________________________
____________ the access point MAC address (_______)
Access point maps a logical port known as the association identifier (AID) to the WLAN client.
Traffic can then flow between the two devices
S Ward Abingdon and Witney College

14. 4/17/2017
Planning the WLAN
Implement a _____________________ prior to construction of a WLAN
RF is a shared medium so the ______________
______________________ for RF
Place AP:
Above obstructions/ at least 3 feet from metal obstructions
Vertically and high up/in the ceiling.
In locations where users will work.
Work out the coverage for each AP.
___________________________
S Ward Abingdon and Witney College

15. Wireless Security/Protocol review
4/17/2017
Wireless Security/Protocol review
These topics are also a review of the same material covered in CSN208
Review- what are some security threats?
Review- what are some disruptive attacks that could affect a business?
Review- what are some Wireless protocols we have studied?
Review- what type of encryption does Wireless use?
S Ward Abingdon and Witney College

16. Controlling Access to the Wireless LAN
4/17/2017
Controlling Access to the Wireless LAN
Possibilities for controlling access:
___________________ - __________________________ from access points
__________ considered a ___________________ since SSID can still be easily discovered
____________________ - Tables are manually constructed on the access point to _________________ __________________________________
_____________ considered a way to secure a WLAN since ______________________________
WLAN _____________________ - ________________
______________________________ of the AP
S Ward Abingdon and Witney College

17. Configuring Access Point
4/17/2017
Configuring Access Point
Remember:
To configure and test incrementally
Most access points have been _______________________ ______________________ with the default settings
________________________________!
S Ward Abingdon and Witney College

18. Basic Wireless Settings
_______________ – Lets you choose the right mode for your devices. B, G, N, mixed or BG mixed. You can disable wireless operation.
__________________ – should be changed from the default.
______________________________ on the network.
_____________ can be enabled or disabled.

19. More Basic Wireless Settings
Radio Band –
For best performance, keep the __________.
For Wireless-N devices only, select Wide - 40MHz Channel.
If you selected Wide for the Radio Band, Select a channel from the drop-down menu of the “Wide Channel” parameter
For Wireless-G and Wireless-B only, select Standard - 20MHz Channel.
If you selected Standard for the Radio Band, Select a channel from the drop-down menu of the “Standard Channel” parameter
See summary graphic next slide…

20. Summary of Linksys Settings

21. Configure Security on the Linksys
Security mode
Mode parameters
RADIUS Server IP address
RADIUS Server Port
Encryption
Pre-shared Key
Key Renewal

22. Configure Security on the Linksys cont…
4/17/2017
Configure Security on the Linksys cont…
Choose _____________________ if all client devices are able to use it.
If some older devices do not support WPA2 then choose the best security mode that is supported by all devices.
Encryption – _______________________. Use AES with WPA2.
S Ward Abingdon and Witney College

23. 4/17/2017
Configure the client
After the access point has been configured, you need to ___________________________________ to allow it to connect to the wireless network.
First, scan for available WLAN’s and SSID’s
If a WLAN does not show up on an auto scan- what could be the problem?
Proceed manually
Add a wireless network
Enter the SSID
Choose the authentication method
Choose the encryption method
Enter the network key.
Now confirm connectivity with the AP using ping
S Ward Abingdon and Witney College

24. Troubleshooting _____________
Generally start with the ___________________ __________________ the TCP/IP stack…
Check the ________________________ then
Update __________________

25. Troubleshooting – no connectivity
4/17/2017
Troubleshooting – no connectivity
Check that the PC has an ___________
Try connecting the PC to the wired network and ping a known address
Try a ___________________. Reload drivers as necessary.
Check the ______________________ settings on the client. Do they match the access point?
S Ward Abingdon and Witney College

26. Troubleshooting – poor connection
Check __________________
Check the ______________ on the client.
Check for devices that might be causing ______________ (cordless phone, microwave oven etc).

27. Troubleshooting – additional questions
4/17/2017
Troubleshooting – additional questions
Are all devices in place?
Are they all powered on?
Are wired links working correctly?
Is there a neighboring access point using an overlapping wave band?
Are access points badly placed?
S Ward Abingdon and Witney College