CCNA Wireless Official Exam Certification Guide part 20 potx

162 CCNA Wireless Official Exam Certification Guide
Exam Preparation Tasks
Review All the Key Concepts
Review the most important topics from this chapter, noted with the Key Topics icon in the
outer margin of the page. Table 9-5 lists a reference of these key topics and the page num-
ber where you can find each one.
Complete the Tables and Lists from Memory
Print a copy of Appendix B, “Memory Tables,” (found on the CD) or at least the section
for this chapter, and complete the tables and lists from memory. Appendix C, “Memory
Tables Answer Key,” also on the CD, includes completed tables and lists to check your
work.
Table 9-5 Key Topics for Chapter 9
Key Topic Item Description Page Number
Figure 9-3 ARPing for the gateway 149
Figure 9-4 ARP request 150
Figure 9-5 ARP forwarded in LWAPP frame 150
Figure 9-6 WLC forwarding the ARP toward the gateway 151
Figure 9-7 Gateway responds to ARP 152
Figure 9-8 WLC receives ARP reply from GW and con-
verts it to LWAPP
153
Figure 9-9 WLC forwards LWAPP frame to AP 154
Figure 9-10 Native VLAN mismatch 155
Table 9-2 VLAN creation commands 157
Example 9-2 Creating VLANs 159
Table 9-3 Port assignment commands 158
Example 9-3 Assigning a port to a VLAN 160
Table 9-4 Enable trunking commands 160
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Chapter 9: Delivering Packets from the Wireless to Wired Network 163
Table 9-6 Chapter 9 Command Reference

Command Description
vlan vlan-id Creates a VLAN
switchport mode access Configures a port as an access port
switchport access vlan vlan-id Assigns a VLAN to a port
switchport mode trunk Enables a port to act as a trunk port
switchport trunk native vlan vlan-id Sets the native VLAN on a trunk
show interface status Verifies VLAN assignments
show interface trunk Verifies trunk configurations
Definition of Key Terms
Define the following key terms from this chapter, and check your answers in the Glossary:
lightweight AP, WLC, ARP, SA, TA, RA, DA, LWAPP, VLAN, access port, trunk port,
802.1Q, native VLAN
Command Reference to Check Your Memory
This section includes the most important configuration and EXEC commands covered in
this chapter. To check to see how well you have memorized the commands as a side effect
of your other studies, cover the left side of Table 9-6 with a piece of paper, read the de-
scriptions on the right side, and see whether you remember the command.
End Notes
1
Configuring VLANs, />10_1587202115_ch09.qxp 9/29/08 2:39 PM Page 163
Cisco Published 640-721 IUWNE Exam Topics
Covered in This Part
Install a basic Cisco wireless LAN
■ Describe the basics of the Cisco Unified Wireless Network architecture (Split MAC,
LWAPP, stand-alone AP versus controller-based AP, specific hardware examples)
■ Describe the Cisco Mobility Express Wireless architecture (Smart Business
Communication System — SBCS, Cisco Config Agent — CCA, 526WLC, 521AP -
stand-alone and controller-based)
■ Describe the modes of controller-based AP deployment (local, monitor, HREAP,
sniffer, rogue detector, bridge)

■ Describe controller-based AP discovery and association (OTAP, DHCP, DNS,
Master-Controller, Primary-Secondary-Tertiary, n+1 redundancy)
■ Describe roaming (Layer 2 and Layer 3, intra-controller and inter-controller, mobility
groups)
■ Configure a WLAN controller and access points WLC: ports, interfaces, WLANs,
NTP, CLI and Web UI, CLI wizard, LAG AP: Channel, Power
■ Configure the basics of a stand-alone access point (no lab) (Express setup, basic
security)
■ Describe RRM
Install Wireless Clients
■ Describe client OS WLAN configuration (Windows, Apple, and Linux.)
■ Install Cisco ADU
■ Describe basic CSSC
■ Describe CCX versions 1 through 5
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Chapter 10 Cisco Wireless Networks Architecture
Chapter 11 Controller Discovery and Association
Chapter 12 Adding Mobility with Roaming
Chapter 13 Simple Network Configuration and Monitoring with the
Cisco Controller
Chapter 14 Migrating Standalone APs to LWAPP
Chapter 15 Cisco Mobility Express
Chapter 16 Wireless Clients
Part II: Cisco Wireless LANs
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This chapter covers the following subjects:
The Need for Centralized Control: Briefly dis-
cusses the need for centralized control in a wireless
deployment.
The Cisco Solution: Looks at the Cisco Unified

Wireless Network.
The CUWN Architecture: Covers the devices in a
Cisco Unified Wireless Network.
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CHAPTER 10
Cisco Wireless Networks
Architecture
Table 10-1 “Do I Know This Already?” Section-to-Question Mapping
Foundation Topics Section Questions
The Need for Centralized Control 1
The Cisco Solution 2–7
The CUWN Architecture 8–17
In the past, wireless networks were deployed on an AP-by-AP basis, and the configuration
for each AP was stored on the AP itself. Management solutions existed, but all in all this is
not a scalable solution. The Cisco Unified Wireless Solution involves an AP that is man-
aged by a controller device. The controller devices can manage multiple APs. The AP con-
figuration is performed on the controller, and each AP added to the network gets its
configuration from a controller. This makes it a more viable solution for large enterprise
networks.
You should do the “Do I Know This Already?” quiz first. If you score 80 percent or higher,
you might want to skip to the section “Exam Preparation Tasks.” If you score below 80
percent, you should review the entire chapter. Refer to Appendix A, “Answers to the ‘Do I
Know This Already?’ Quizzes,” to confirm your answers.
“Do I Know This Already?” Quiz
The “Do I Know This Already?” quiz helps you determine your level of knowledge of this
chapter’s topics before you begin. Table 10-1 details the major topics discussed in this
chapter and their corresponding quiz questions.
1. What kind of AP does a controller manage?
a. Lightweight AP
b. Managed AP

c. LDAP AP
d. Autonomous AP
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168 CCNA Wireless Official Exam Certification Guide
2. Which of the following is not a functional area of the Cisco Unified Wireless Net-
work?
a. AP
b. Controller
c. Client
d. ACS
3. Of all the Cisco Wireless LAN Controllers, what is the greatest number of APs you
can support?
a. Up to 50
b. Up to 150
c. Up to 300
d. Up to 30,000
4. What protocol is used for communication between an AP and a WLC?
a. STP
b. LWAPP
c. LDAP
d. TCP
5. Which of the following functions does the controller handle? (Choose all that apply.)
a. Association
b. Reassociation when you have clients that are roaming
c. The authentication process
d. Frame exchange and the handshake between the clients
6. Which of the following functions does the AP handle? (Choose all that apply.)
a. Buffer and transmit the frames for clients that are in power-save mode
b. Frame bridging
c. Send responses to probe requests from different clients on the network

d. Forward notifications of received probe requests to the controller
7. How many VLANs does an AP typically handle?
a. 13
b. 15
c. 16
d. 512
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Chapter 10: Cisco Wireless Networks Architecture 169
8. How many elements comprise the CUWN architecture?
a. 5
b. 10
c. 15
d. 20
9. Which of the following APs support 802.11a/b and g? (Choose all that apply.)
a. 1130AG
b. 1240AG
c. 1300 series
d. 1400 series
10. Which AP supports the 802.11n draft version 2.0?
a. 1250 series AP
b. 1240 AG
c. 1300 series
d. 1130 AG
11. When an AP operates in H-REAP mode, where would it be seen?
a. In a campus
b. At the remote edge of a WAN
c. In the data center
d. Bridging site-to-site
12. The 4400 series WLC, model AIR-WLC4404-100-K9, can support up to how many
APs?

a. 50
b. 100
c. 300
d. 600
13. True or false: An AP must run the same version of code as the controller.
a. True
b. False
14. What type of device is the 3750G series Wireless LAN Controller integrated into?
a. A router as a module
b. A router as part of the code
c. A 3750 series switch
d. It’s a blade for the 6500 series.
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170 CCNA Wireless Official Exam Certification Guide
15. How many APs can the Cisco WiSM manage?
a. 100
b. 150
c. 300
d. 600
16. How many lightweight APs can you have in a mobility domain?
a. 512
b. 1024
c. 3068
d. 7200
17. With wireless network management, what device is used to track more than one
device at a time?
a. WCS
b. WCS navigator
c. Location appliance
d. Rogue AP detector

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Chapter 10: Cisco Wireless Networks Architecture 171
Network
Management
Network
Services
Network
Unification
CUWN Functional Areas
Access
Points
Wireless
Clients
Figure 10-1 Quick Look at the CUWN
Foundation Topics
The Need for Centralized Control
There is certainly a need for centralized control in wireless deployments today. Initial
wireless deployments were based on standalone access points called autonomous access
or fat APs. An autonomous AP is one that does not rely on a central control device. Al-
though this is a great start, the problem lies in scalability. Eventually, you will have prob-
lems keeping your configurations consistent, monitoring the state of each AP, and actually
taking action when a change occurs. You end up with holes in your coverage area, and
there is no real dynamic method to recover from that. There is certainly a need for central-
ized control, and the Cisco Unified Wireless Network (CUWN) is based on centralized
control.
Eventually you will want or need to convert those standalone APs, if possible, to light-
weight APs. A lightweight AP is managed with a controller.
Traditionally after a site survey, you would deploy your wireless network based on the in-
formation you gathered. As time passes, the environment you did the original site survey
in will change. These changes, although sometimes subtle, will affect the wireless cover-

age. The CUWN addresses these issues.
An AP operating in lightweight mode gets its configuration from the controller. This
means that you will perform most of your configuration directly on the controller. It dy-
namically updates the AP as the environment changes. This also allows all the APs to share
a common configuration, increasing the uniformity of your wireless network and eliminat-
ing inconsistencies in your AP configurations.
The Cisco Solution
The CUWN solution is based on a centralized control model. Figure 10-1 illustrates the
numerous components of the CUWN.
As you can see, five functional areas exist:
■ Wireless clients
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