Wired and Wireless Infrastructure

Question 1

Even though it is not best practice, you are tasked to mount a Cisco AP vertically on a wall. Which mounting brackets could you use?

Answer 1

AIR-AP-BRACKET-2 (also called the universal bracket)

Question 2

While PoE injectors do indeed not extend the maximum cable length restriction of 100m, they only support PoE (802.3af) and PoE+ (802.3at), which means up to 30W? True/False

Answer 2

True

Question 3

A Permanent license is a license that is programmed into nonvolatile memory at time of manufacturing. These licenses are not transferrable between WLCs? True/False

Answer 3

True

Question 4

Evaluation licenses can be used in demo deployments and are active for 90 days? True/False

Answer 4

True

Question 5

Adder licenses are additional AP licenses that can be activated on WLCs that have already been deployed in production environments. These licenses can also be transferred between controllers? True/False

Answer 5

True

Question 6

Smart Licensing is a cloud-based licensing model where a central pool of AP software licenses exist in a customer-defined Smart Account. These licenses can be transferred between controllers? True/False

Answer 6

True

Question 7

Catalyst 9800 controllers require mandatory Smart Licensing. This means that customers have a central pool of AP software licenses in their cloud-based Smart Account. These licenses can be used across multiple controllers and are not directly applied to a specific controller? True/False

Answer 7

True

Question 8

Neighbor Discovery Protocol (NDP) advertisements are always transmitted at the highest power for the channel and at the lowest data rate. By always using the highest power, the APs receiving the NDP advertisements can calculate the free space path loss. By using all data rates, the NDP advertisements can be demodulated from further away, reaching more APs? True/False

Answer 8

True

Question 9

The RF profile ‘Default-Profile’ does not exist. APs that are in the default group are applied the Global RRM Settings? True/False

Answer 9

True

Question 10

The metrics that affect the Cost Metric (CM) value of DCA by default is Cross Channel Interference CCI, 802.11 Interference, Non-802.11 noise? True/False

Answer 10

True

Question 11

The characteristics that is changed that affects RxSOP threshold are AP Receive Sensitivity and AP usable cell size? True/False

Answer 11

True

Question 12

RxSOP can lower CCI and lower the amount of sticky clients by ignoring frames that are received below a certain RSSI threshold. This effectively changes the receive sensitivity of the AP. It also changes the usable cell size of the AP because the client will need to be closer to the AP to make sure the AP receives their packets above the RSSI threshold. The transmit power of the AP stays the same? True/False

Answer 12

True

Question 13

As the RX-SOP value increase, only packets of a higher RSSI value are decoded by the AP’s radio. This decreases the cell size as shown in the figure above, but ensures that all clients are connected with a good RSSI value? True/False

Answer 13

True

Question 14

When an AP receives a wireless frame with an RSSI above its RxSOP threshold the AP demodulates the frame. Sending a disassociation frame to the client is only done by a Cisco feature called Optimized Roaming? True/False

Answer 14

True

Question 15

A client is referred as “Sticky Client” when it does not roam or move to a nearby AP connection that has stronger signal strength? True/False

Answer 15

True

Question 16

Cisco Optimized Roaming addresses the sticky client challenge by pro-actively disconnecting clients, thus enabling the clients to move to a nearby AP that offers stronger connectivity. It actively monitoring Data RSSI packets and enforces client disassociation when the RSSI is lower than the set threshold? True/False

Answer 16

True

Question 17

The amount of packet loss acceptable in data-only designs is 10%? True/False

Answer 17

True

Question 18

The data rates that you set as the basic rate on a wireless network that must support 802.11b devices are 1, 2, 5.5 and 11 Mbps? True/False

Answer 18

True

Question 19

The goal of a data-only wireless design is to provide adequate coverage and acceptable performance. High capacity and very high signal strength are not a concern? True/False

Answer 19

True

Question 20

The 802.11 standard used to minimize disruptive roaming events is 802.11r? True/False

Answer 20

True

Question 21

802.11r or Fast transition (FT) is designed to make roaming seamless by bypassing both the full 802.1X/EAP authentication and 4-way handshake? True/False

Answer 21

True

Question 22

The maximum amount of retransmissions (in percent) that Cisco recommends for voice deployments?

Answer 22

20%

Question 23

The gray area on the map most likely represents areas with a signal strength of less than -67 dBm. The value of -67 dBm is used as the minimum threshold because the wireless network must support voice? True/False

Answer 23

True

Question 24

Adding APs to the perimeter and corners of the buildings creates a convex hull where the location services work best? True/False

Answer 24

True

Question 25

When designing a high-density Wi-Fi network you reduce the APs’ cell size by using external directional antennas, increase mandatory minimum data rate, lower AP Tx Power and attenuate the signal within the room? True/False

Answer 25

True

Question 26

BandSelect is Cisco’s implementation of Band Steering, which encourages clients to connect with the 5 GHz network instead of 2.4 GHz? True/False

Answer 26

True

Question 27

Your main weapon when designing a high-density Wi-Fi network is to reduce the AP’s cell size? True/False

Answer 27

True

Question 28

The AP modes that are valid modes for MAPs participating in a mesh network are bridge mode and flex+bridge mode? True/False

Answer 28

True

Question 29

In a mesh environment the primary interfaces are also called the back-hauling interfaces. These interfaces act as trunks for traffic originating from the secondary interfaces, which are de physical Ethernet interfaces of the mesh AP? True/False

Answer 29

True

Question 30

There are 4 mesh MAC addresses used in a mesh packet? True/False

Answer 30

True

Question 31

The protocol that provides the necessary features for allowing multiple devices behind a WGB is the Internet Access Point Protocol IAPP? True/False

Answer 31

True

Question 32

The IAPP is used by a WGB to report the MAC addresses of wired clients to the mesh? True/False

Answer 32

True

Question 33

The maximum amount of clients one WGB can support is 20? True/False

Answer 33

True

Question 34

A universal WGB limits the number of devices you can use behind it to one? True/False

Answer 34

True

Question 35

In mesh networks the native VLAN for traffic coming from a WBG is the VLAN associated with the SSID the WGB is connected to? True/False

Answer 35

True

Question 36

If a wired client does not send traffic for an extended period of time, the WGB removes the client from its bridge table, even if traffic is continuously being sent to the wired client? True/False

Answer 36

True

Question 37

Features not supported by Wireless Group Bride are mac filtering, link test, idle timeout? True/False

Answer 37

True

Question 38

Wired clients behind a WGB cannot connect to a DMZ/Anchor controller. To enable wired clients behind a WGB to connect to an anchor controller in a DMZ, you must enable VLANs? True/False

Answer 38

True

Question 39

2.4 GHz has 3 non-overlapping channels and 5Ghz has (23)/25 non-overlapping channels? True/False

Answer 39

True

Question 40

Duty cycle is the time during which a given transmitter is transmitting and measured as of the total time available and relates directly to channel utilization. True/False?

Answer 40

True

Question 41

What increases the duty cycle is re-transmitting a frame or data rate shifting impacting the overall channel utilization? True/False?

Answer 41

True