Wireless

Question 1

What is the Law of Zero?

Answer 1

Law of Zero is a value of 0 dB which means the two absolute power values are equal.

Question 2

What is the Law of 3s?

Answer 2

Law of 3s is a value of 3dB which means that the power value of interest is double the reference value. -3 is half

Question 3

What is the Law of 10s?

Answer 3

Law of 10s is a value of 10dB which means that the power value of interest is 10 times the reference value.

Question 4

What is EIGP?

Answer 4

Effective isotropic radiated power (EIRP) is the actual power level that will be radiated from the antenna.

Question 5

Free space loss is a function of what two values?

Answer 5

Free space loss is a function of distance and frequency only.

Question 6

What is RSSI?

Answer 6

Received signal strength indicator (RSSI) is a receiver’s measured

Question 7

What device makes the decision for a wireless client to roam from one AP to another?

Answer 7

The Client device decides when to roam to another AP.

Question 8

What is the next step after an AP boots up?

Answer 8

The next step after an AP boots would be to discover a WLC.

Question 9

After an AP discovers the controller, what is the next step?

Answer 9

After an AP discovers a controller to join it attempts to build a CAPWAP tunnel with the controller.

Question 10

What are two client authentication modes that WPA supports?

Answer 10

WPA supports Pre-Shared Key (PSK) and 802.1x. These are also known as personal and enterprise modes respectively.

Question 11

With personal mode, a key string must be shared or configured on which devices on the network?

Answer 11

The key string must be shared or configured on every client and AP before the clients can connect to the wireless network.

Question 12

In EAP, what device is the middleman between the clients and the Authentication Server?

Answer 12

The WLC

Question 13

in 802.1x, what is the supplicant?

Answer 13

Supplicant is the client device that is requesting access.

Question 14

Who is the authenticator?

Answer 14

Authenticator is the network device that provides access to the network (usually a WLC)

Question 15

What is the Authentication server (AS)?

Answer 15

The Authentication server (AS) is a device that takes user or client credentials and permits or denies network access based on the database and policies (usually a RADIUS server).

Question 16

If a lightweight AP needs to download a new software image, how does it get the image?

Answer 16

AP gets the image from a WLC.

Question 17

What kind of gain and beamwidth does an omnidirectional antenna usually have?

Answer 17

Omidirectional antenna usually has low gain and large beamwidth.

Question 18

An AP in local mode does what?

Answer 18

Local mode is the default lighweight mode that offers one or more functioning BSSs on a specific channel. During times when not transmitting, the AP scans other channels to measure interference and other events,

Question 19

When a client moves its association from one autonomous AP to another, it is actually leaving and joining which one of the following?

Answer 19

BSS

Question 20

Ten lightweight APs are joined to a wireless LAN controller. If a client roams from one of the APs to another, which one of the following correctly describes the roam?

Answer 20

Intracontroller roaming

Question 21

Which of the following provides the most efficient means for roaming, as measured by the time to complete the roam?

Answer 21

Intracontroller roaming

Question 22

What authentication method does WPA2 personal mode use?

Answer 22

Pre-Shared Key

Question 23

What is the authentication method when 802.1x is used on a WLAN?

Answer 23

EAP

Question 24

A Cisco WLC is configured for 802.1x authentication, using an external RADIUS server. The controller takes on which one role?

Answer 24

WLC takes on the authenticator role.

Question 25

When PSK authentication is used on a WLAN, without the use of an ISE server, which devices need to be configured with the key string?

Answer 25

All wireless clients, APs, and WLCs.