CCNA Wireless Official Exam Certification Guide part 22 pdf

Unauthorized use not permitted.Figure 10-8 Cisco 4400 Series Wireless LAN Controller that can be installed in 6500 series switches or in Integrated Services Routers ISR.. The Cisco 44xx

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-8 Cisco 4400 Series Wireless LAN Controller

that can be installed in 6500 series switches or in Integrated Services Routers (ISR) There are also appliance-based controllers, which include the 44xx series WLC as well as the

2100 series WLC Which controller you require depends on how many APs you need de-ployed This can be anywhere from six to 300 access points per controller This is a fixed value and can’t be upgraded via licensing If you need to support more APs, you need an-other controller or a controller that supports more APs

The Cisco 44xx Series WLC The Cisco 44xx series Wireless LAN Controller, shown in Figure 10-8, is a standalone ap-pliance

It is designed to take up one rack unit It has either two or four Gigabit Ethernet uplinks, and they use mini-GBIC FSG slots It can support 12, 25, 50, or 100 APs, depending on the model And it can support up to 5000 MAC addresses in its database

The 4400 series has a 10/100 interface called a service port; it is used for SSH and SSL connections for management purposes The service port can be used for out-of-band man-agement, but it is not required to manage the device You can manage the device via the controller’s logical management interface There is also a console port that you can use to connect via HyperTerminal or Teraterm Pro

Depending on the country you are in, power requirements vary, but the chassis has two power supply slots

The controller code version used for the CCNA Wireless exam is version 5.x, and the AP runs the same version It’s actually a requirement that they run the same version, so when

an AP joins with a controller, the controller upgrades or downgrades the AP The con-troller upgrades four APs at a time The 4400 series can support up to 100 access points

So, a 4400 would upgrade ten APs at a time until they are all upgraded

The 3750-G WLC The 3750-G Wireless LAN Controller, shown in Figure 10-9, is integrated into a switch There are two assemblies—the WS-C3750G-24PS-E and the AIR-WLC4402-*-K9 The two assemblies are connected to the SEPAPCB assembly, which has two Gigabit Ethernet links connecting through SFP cables and two GPIO control cables The major benefits of this integration into the switching platform include the following:

■ Conservation of space

Key

Topic

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-9 Cisco 3750-G Series Wireless LAN Controller

■ Integration of the backplane of the controller and switch

■ It saves ports The 3750G is stackable with the 3750G switches, so you can stack it with other 3750s that do not have the controller in them The features it supports are the same as with the

4402 controllers; the only difference is the physical ports

The Cisco WiSM The Cisco WiSM, shown in Figure 10-10, is a services module that installs in the 6500 se-ries switch or 7600 sese-ries router with the Cisco Supervisor Engine 720

It has the same functionality as the 4400 series standalone controllers; the difference is that it supports up to 300 APs The WiSM supports 150 access points per controller, with each blade having two controllers Thus, you can have a total of 300 access points You can also cluster 12 of them into a mobility domain This allows up to 7200 lightweight APs in a mobility domain

The Cisco 2106 WLC The Cisco 2106 Wireless LAN Controller, shown in Figure 10-11, is also a single-rack unit design with eight 10/100 Ethernet ports

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-10 Cisco WiSM

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-11 Cisco 2106 Series Wireless LAN Controller

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-12 Cisco WLCM

It can support up to six primary access points It has an RJ-45 console port and two RJ-45 ports that support PoE It has nearly all the same features as the 4400 series controllers but has eight built-in switch ports You can expect to see this controller in a small branch environment

The Cisco WLCM The Wireless LAN Controller Module (WLCM), shown in Figure 10-12, is designed for the ISR routers You would see this controller in a small office

It has the same functionality as the 2106, but it does not have the directly connected AP and console port It supports six APs The WLCM-Enhanced (WLCM-E) supports eight

or 12 APs, depending on which module you get

■ The ability to be a DHCP server

■ Layer 2 security

The differences are things such as the following:

■ Lack of PoE ports

■ The number of APs supported

■ The LWAPP modes supported

For these reasons, you see the WLCM deployed in smaller branches

Wireless LAN Controller Summary Table 10-3 summarizes the Cisco Wireless LAN Controller models

Wireless Network Management

In very large networks, a single wireless controller isn’t enough to manage all your APs

This type of scenario might call for the Cisco Wireless Control System (WCS) The WCS

is a single point of management for up to 3000 lightweight APs and 1250 autonomous APs The WCS runs on a Windows or Red Hat Linux server To scale beyond 3000 APs, you would need the WCS Navigator The WCS Navigator enables you to navigate between different wireless control systems It is a manager of managers, so to speak You can use the WCS Navigator to navigate between different WCS servers You can then scale it up

to 30,000 APs in a single deployment and support up to 20 WCS deployments, all within the WCS Navigator There is also an additional appliance you can use, called the Cisco Wireless Location Appliance, as shown in Figure 10-13

Table 10-3 Controller Summary

Controller Mode Number of APs Supported Environment Deployed In

WiSM 300 per WiSM, up to 3600 Enterprise (service module)

Courtesy of Cisco Systems, Inc Unauthorized use not permitted.

Figure 10-13 Cisco Location Appliance

This is designed to do location tracking for Wi-Fi devices and RFID tags It helps track thousands of devices

Table 10-4 Key Topics for Chapter 10

Paragraph from the section

“Features of the Cisco Controllers”

Lists detailing access point and Cisco controller responsibilities

172

List from the section

“Access Points”

Description of the two types

of access points

176

Paragraphs from the section

“The Cisco 44xx Series WLC”

Description of the specifications and capabilities of the Cisco 44xx series WLC

182

Review the most important topics from this chapter, denoted with the Key Topic icon

Table 10-4 lists these key topics and the page number where each one can be found

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

Definition of Key Terms

Define the following key terms from this chapter, and check your answers in the glossary:

Lightweight AP, Autonomous AP, WLCM, WLCS

References

Cisco Wireless Services Module (WiSM): http://tinyurl.com/6mngkj Migrate to the Cisco Unified Wireless Network: http://tinyurl.com/5uo78w Cisco Unified Wireless Network: Secure Wireless Access for Business-Critical Mobility:

http://tinyurl.com/687nff

This chapter covers the following subjects:

Understanding the Different LWAPP Modes: A discussion of Layer 2 and Layer 3 LWAPP

How an LWAPP AP Discovers a Controller: A discussion regarding the process that an AP goes through when finding a controller

How an LWAPP AP Chooses a Controller and Joins It: The process an AP takes when it chooses

a controller to join

How an LWAPP AP Receives Its Configuration: The process an AP takes when it retrieves its configuration

Redundancy for APs and Controllers: How to provide redundancy for your APs

The AP Is Joined, Now What?: A discussion on the different functions an AP can perform

Controller Discovery and Association

Table 11-1 “Do I Know This Already?” Section-to-Question Mapping

How an LWAPP AP Chooses a Controller and Joins It 6–8 How an LWAPP AP Receives Its Configuration 9

When a lightweight AP boots up, it cannot function without a controller In this chapter, you will learn about the Lightweight Access Point Protocol (LWAPP) and the modes in which it can operate You will also learn about how an AP finds controllers on the net-work, chooses one to join with, and then retrieves its configuration In addition, you will look at the ways to provide redundancy for your AP in the event that a controller goes down Finally, when an AP is joined with a controller, it can operate in certain modes that can be used for different reasons You will learn these operational modes and when they are used

You should do the “Do I Know This Already?” quiz first If you score 80 percent or higher, you may want to skip to the section “Exam Preparation Tasks.” If you score below 80 per-cent, you should spend the time reviewing the entire chapter Refer to Appendix A, “An-swers to the ‘Do I Know This Already?’ Quizzes,” to confirm your an“An-swers

“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 11-1 details the major topics discussed in this chapter and their corresponding quiz questions

1. What two modes can LWAPP operate in? (Choose two.)

a. Layer 2 LWAPP mode

b. Joint LWAPP mode

c. Autonomous LWAPP mode

d. Layer 3 LWAPP mode

2. When LWAPP communication between the access point and the wireless LAN con-troller happens in native, Layer 2 Ethernet frames, what is this known as?

a. EtherWAPP

b. Hybrid mode

c. Native mode LWAPP

d. Layer 2 LWAPP mode

3. What is the only requirement for Layer 3 LWAPP mode?

a. IP connectivity must be established between the access points and the WLC

b. You must know the IP addressing on the AP

c. Client devices must be in the same VLAN

d. Each device in the Layer 3 domain must be on the same subnet

4. Which state is not a valid state of an AP that is discovering and joining a controller?

a. Discover

b. Join

c. Image Data

d. Hybrid-REAP

5. What is the first step in a Layer 3 LWAPP discovery?

a. Priming

b. AP Join Request

c. Subnet broadcast of Layer 3 LWAPP discovery message

d. OATAP

6. AP-Priming is used for which of the following?

a. Prime an AP prior to bootup with complex algorithms

b. Deliver a list of controllers to the AP using a hunting process and discovery algo-rithm

c. Perform basic setup of controller configurations delivered to the AP

d. Provision an AP over the air

7. Which of the following is not contained in a join response message?

a. Type of controller

b. Interfaces in the controller

c. Number and type of radios

d. AP name

d. The AP is primed.

9. If no primed information is available, what does the AP look for next when trying to join a controller?

a. A master controller

b. A primer controller

c. A new controller

d. A new subnet

10. When an AP retrieves its configuration file, where is it applied?

a. RAM

b. ROM

d. Flash

11. How many backup controllers are in an N + 1 design?

a. 1

b. 2

c. 3

d. 4

12. Which method is considered the most redundant?

a. N + 1

b. N + N

c. N + N + 1

d. N * N + 1

13. Which AP mode can you use for site surveys?

a. Local mode

b. H-REAP mode

c. Bridge mode

d. Rogue Detection mode

14. In Monitor mode, which command can you use to change the value of the channels monitored?

a config advanced channel-list

b config advanced 802.11b channel-list monitor

c config advanced 802.11b monitor channel-list d.