Topic 5 WLAN Concepts Flashcards
True or False: Laptops that do not have an integrated wireless NIC can only be attached to the network through a wired connection.
The correct answer is False. This is because laptops that do not have an integrated wireless NIC can use a USB wireless NIC to attach to the network.
Which of the following components are integrated into a wireless home router? (AP, Switch, Router, Range Extender)
Wireless home routers are integrated devices that include an AP, a switch for wired clients, and a router for connecting to another network, such as the Internet.
True or False: When you need to expand the coverage of a small network, the best solution is to use a range extender.
The correct answer is False: While range extenders are easy to set up and configure, the best solution would be to install another wireless access point to provide dedicated wireless access to the user devices.
Which of the following is a standalone device, like a home router, where the entire WLAN configuration resides on the device? (Range Extender, Autonomous AP, Controller-Based AP, USB Wireless NIC)
An autonomous AP is a standalone device, like a home router, where the entire WLAN configuration resides on the device.
Which of the following antennas provide 360 degrees of coverage? (Wireless NIC, Directional, OmniDirectional, MIMO)
An omnidirectional antenna provides 360 degrees of coverage.
3 802.11 Wireless Topology Modes
Ad hoc mode, Infrastructure Mode, Tethering
What is the 802.11 Frame Structure
Header, Payload, FCS.
The header contains:
Frame Control - This identifies the type of wireless frame and contains subfields for protocol version, frame type, address type, power management, and security settings.
Duration - This is typically used to indicate the remaining duration needed to receive the next frame transmission.
From a wireless device:
Address 1 Receiver Address - MAC address of the AP.
Address 2 Transmitter Address - MAC address of the sender.
Address 3 SA/DA/BSSID - MAC address of the destination which could be a wireless device or wired device.
From the AP:
Address 1 Receiver Address - MAC address of the sender.
Address 2 Transmitter Address - MAC address of the AP.
Address 3 SA/DA/BSSID - MAC address of the wireless destination.
Sequence Control - This contains information to control sequencing and fragmented frames.
Address4 - This usually missing because it is used only in ad hoc mode.
Payload - This contains the data for transmission.
FCS - This is used for Layer 2 error control.
Which wireless topology mode is used by two devices to connect in a peer-to-peer network? (Ad hoc, Infrastructure, Tethering)
Ad hoc mode is used when two devices connect wirelessly in a peer-to-peer (P2P) manner without using APs or wireless routers.
True or False: An ESS is created when two or more BSSs need to be joined to support roaming clients.
The correct answer is True: When two or more BSSs need to support roaming clients, they can be joined together to create an ESS.
How many address fields are in the 802.11 wireless frame?
4
What is the term for an AP that openly advertises its service periodically?
In passive mode, the AP openly advertises its service by periodically sending broadcast beacon frames containing the SSID, supported standards, and security settings.
What is the term for an AP that does not send a beacon, but waits for clients to send probes?
In active mode, wireless clients initiate the process by broadcasting a probe request frame with the SSID on multiple channels. APs configured with the SSID will send a probe response that includes the SSID, supported standards, and security settings.
What is the CAPWAP protocol?
Control and Provision Wireless Access Point Protocol
Name WLAN threats
DoS Attacks
Rogue Access Points
Man-in-the-middle Attack
Ways to secure WLAN
SSID Cloaking
MAC Address Filtering
Encryption
