Wireless Flashcards
What does WLC stand for?
Wireless LAN controller
What is a WLAN?
A wireless local network
What does IBSS stand for?
Independent basic service set
What is a service set?
In computer networking, a service set is a set consisting of all the devices associated with a consumer or enterprise IEEE 802.11 wireless local area network (WLAN). The Service set can be local, independent, extended or mesh.
Wikipedia
What does AP stand for and what is an AP?
In computer networking, a wireless Access Point (AP) is a device that allows wireless devices to connect to a wired network using Wi-Fi, or related standards.
What does ESS stand for?
Extended service set
What is an SSID and how is it chosen?
It is a series of 0 to 32 octets that identifies a basic or extended service set. It’s chosen by the client device that starts a wireless network.
What is the physical area of radio frequency coverage provided by an access point called?
The basic service area
What is created when multiple access points are combined to create a larger service area?
An Extended Service Area (ESA)
What are the required components for securing a WLAN?
- Encryption
- Authentication
- Intrusion prevention/detection
Which of the following is true?
Wireless networks use half duplex.
Wireless networks use full duplex.
Wireless networks use CSMA/CD.
Wireless networks are half duplex.
What type of collision-prevention do WLANs use? How does it work?
CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance). A node listens to the channel to determine whether it’s “idle” or “busy”. If the channel is idle, the node transmits the data. If busy, the node waits for a random interval and then listens again. If the channel has become idle, the device transmits the data. If it’s still busy, the device increments the wait timer and waits again, repeating the process until the channel is idle.
Which of these is a specified authentication type for 802.11 networks?
WPA2
802.1x Authentication
Open Authentication
WEP
Open Authentication
802.11 specifies two types of authentication: open and shared-key. This is only used for authentication between the client and the access point - it’s different from authentication used on the network.
What factor determines which access point a wireless client will associate with?
The client will associate with the access point from which it receives the strongest signal.
What is WEP and what is its purpose?
Wired equivalent of privacy – WEP is a security protocol that was introduced with 802.11 wireless networks. It was intended to provide data confidentiality equivalent to that on wired networks. (There have been serious weaknesses found in it.)
