CCNA 2 Module 13 Quiz – WLAN Configuration (Answers)

1. A user is configuring a wireless access point and wants to prevent any neighbors from discovering the network. What action does the user need to take?

  • Configure DMZ settings.
  • Configure a DNS server.
  • Disable SSID broadcast.
  • Enable WPA encryption.
Explanation: Disabling SSID broadcast prevents the access point from announcing the name of the network. Enabling WPA encryption, configuring DMZ settings, and configuring a DNS server will accomplish different tasks, but the name of the network will still be announced.

2. When a wireless network in a small office is being set up, which type of IP addressing is typically used on the networked devices?

  • network
  • public
  • wireless
  • private
Explanation: In setting up the wireless network in a small office, it is a best practice to use private IP addressing because of the flexibility and easy management it offers.

3. A user has just purchased a generic home router and would like to secure it. What should be done to help secure the wireless home router?

  • Change the default SSID.
  • Set a private IPv4 network for the internal network.
  • Allow only IPv6 traffic to enter the router.
  • Change the default administrator password.
Explanation: The home router allows a designated administrator to manage the network. Anyone who knows the account username and password can log into the router itself, which grants complete access to the features of the device and information about any devices that are connected. Most router manufacturers configure their new routers with the same default username and password and thus changing the default administrator password is a step towards securing the home router.

4. Which protocol could be used by a company to monitor devices such as a wireless LAN controller (WLC)?

  • SSH
  • NTP
  • PAT
  • SNMP
Explanation: The Simple Network Management Protocol (SNMP) is an application layer protocol used to monitor and manage the network. Network devices must be configured with a community name and IP address of the SNMP server.

5. When configuring a Cisco 3500 series wireless LAN controller (WLC) for a WPA2 Enterprise WLAN, what has to be created on the WLC before creating the new WLAN?

  • a security module
  • a new SSID
  • a VLAN for the wireless network
  • a security policy
Explanation: On a Cisco 3500 series wireless controller, a new interface for each new wireless network controlled by the WLC must be created. The interface and VLAN are created before configuring the wireless network.

6. What is a DHCP scope as it relates to a WLAN configured on the WLC controller?

  • a pool of IP addresses for WLAN clients
  • a corporate plan for allocation of IP addresses for wireless clients
  • security rules associated with DHCP for WLANs
  • the distance allotted for wireless clients that can receive IP addressing information
Explanation: When configuring a WLC controller as a DHCP server, use the DHCP Scope menu option to configure IP address-related settings such as the range of IP addresses to assign to WLAN devices, a DNS server address, and lease time.

7. Why would a technician configure a passphrase for a WLAN on a wireless router?

  • to protect someone from changing the configuration
  • to protect the SSID from being changed
  • to protect someone from cabling directly to the router and accessing the router
  • to configure wireless client authentication
Explanation: When a WLAN on a wireless router is being configured, a passphrase is used in the wireless security settings for a specific security mode. Clients must be configured for the same security mode and the same passphrase in order to access the WLAN.

8. A customer installs a wireless access point at home in the closet next to the kitchen. The customer mentions that the wireless communication performance seems degraded when the cordless phone or the microwave oven is in use. What is the possible reason for this degradation?

  • The surge of electricity when a microwave oven is in use disrupts the operation of the access point.
  • The cordless phone joins the WLAN and shares the available bandwidth.
  • The wireless signal is in the same radio frequency range as the household devices are in.
  • The access point is on the same electrical circuit as the phone base unit and microwave oven are.
  • The access point is close to walls.
Explanation: Because wireless networks use air as a medium, interference from other sources commonly cause degradation issues. Sources can include cordless phones, fluorescent lighting, microwave ovens, and other wireless devices that use the same frequencies.

9. What functionality is required on routers to provide remote workers with VoIP and videoconferencing capabilities?

  • IPsec
  • PPPoE
  • QoS
  • VPN
Explanation: Quality of service (QoS) needs to be enabled on routers to provide support for VoIP and videoconferencing. QoS refers to the capability of a network to provide better service to selected network traffic, as required by voice and video applications.

10. A wireless router is displaying the IP address of 192.168.0.1. What could this mean?

  • Dynamic IP address allocation has been configured on the router and is functioning correctly.
  • The wireless router has been configured to use the frequencies on channel 1.
  • The NAT function is not working on the wireless router.
  • The wireless router still has the factory default IP address.
Explanation: Wireless routers usually come with factory default settings. The IP address is often set to 192.168.0.1. The default username and password are often admin. The IP address, username, and password should all be modified to help secure the router.

11. A laptop cannot connect to a wireless access point. Which two troubleshooting steps should be taken first? (Choose two.)

  • Ensure that the wireless SSID is chosen.
  • Ensure that the correct network media is selected.
  • Ensure that the NIC is configured for the proper frequency.
  • Ensure that the laptop antenna is attached.
  • Ensure that the wireless NIC is enabled.
Explanation: A wireless laptop normally does not have an antenna attached unless a repair has recently been implemented. If the wireless NIC is enabled, the correct media, radio, will be used. When the NIC detects an access point, the correct frequency is automatically used.

12. In setting up a small office network, the network administrator decides to assign private IP addresses dynamically to workstations and mobile devices. Which feature must be enabled on the company router in order for office devices to access the internet?

  • UPnP
  • NAT
  • QoS
  • MAC filtering
Explanation: Network Address Translation (NAT) is the process used to convert private addresses to internet-routable addresses that allow office devices to access the internet.

13. What is a difference between autonomous APs that operate in a home environment and controller-based APs that operate in a corporate environment?

  • Controller-based APs can be automatically configured and managed by a WLAN controller.
  • Controller-based APs are known as lightweight APs and require an initial configuration to operate.
  • Autonomous APs do not support PoE.
  • Autonomous APs incorporate the functions of a router, switch, and AP into one device.
Explanation: Autonomous APs are standalone devices that are configured via Cisco CLI or a GUI. Controller-based APs are server-dependent devices that require no initial configuration to operate, because they are automatically configured and managed by a WLAN controller. Most autonomous and controller-based APs support PoE.

14. Which WLC tab would a network administrator typically use to see a summary view of the most heavily used WLANs including the number of clients using a particular WLAN?

  • Commands
  • Monitor
  • WLANs
  • Controller
Explanation: Use the Monitor tab and then the Summary option to see information about the WLC, including the IP address and system uptime as well as information associated with the top WLANs configured and active within the organization.

15. Users on an IEEE 802.11n network are complaining of slow speeds. The network administrator checks the AP and verifies it is operating properly. What can be done to improve the wireless performance in the network?

  • Switch to an 802.11g AP.
  • Split the wireless traffic between the 802.11n 2.4 GHz band and the 5 GHz band.
  • Set the AP to mixed mode.
  • Change the authentication method on the AP.
Explanation: The easiest way to improve wireless performance is to split the 802.11n wireless traffic between the 2.4 GHz band and the 5 GHz band. IEEE 802.11n networks can use the two bands as two separate wireless networks to help manage the traffic.

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