Wireless LAN Topologies Flashcards
What are the 4 types of wireless networks?
WPAN (wireless personal-area network)
WLAN (wireless local-area network)
WMAN (wireless metropolitan-area network)
WWAN wireless wide-area network)
With WPAN, what IEEE standard is it based on and how large an area does it cover?
802.15 (includes technologies like bluetooth and zigbee)
Usually covers about 20 to 30 feet.
Wit WLAN, what IEEE standard is it based on and how large an area does it cover?
802.11
Covers up to 300 feet.
What frequencies are usually used for WPAN?
Unlicensed ISM frequencies including 2.4GHz.
With WMAN, what IEEE standard is it based on and what frequencies are commonly used?
802.16 (one example - WiMAX)
Licensed frequencies are commonly used.
What is the typical device used in WWAN?
Mobile phone
Wifi communications operate at what kind of duplex?
Half-duplex
What does BSS stand for and what is it?
Basic Service Set
Closed group of mobile devices that forms around a fixed device (AP)
What does BSA stand for and what is it?
Basic Service Area
Area where the AP’s signal is usable which is also referred to as a cell.
What does BSSID stand for and what is it?
Basic Service Set Identifier
AP uses a unique BSS identifier to advertise itself and it is based on the AP’s own radio MAC address.
What does SSID stand for and what is it?
Service Set Identifier
A non-unique, human-readable name that identifies a wireless service.
What is membership with the BSS called?
Association
What is a device that has associated to an AP called?
Client or 802.11 station (STA)
What is the upstream wired Ethernet for the wireless BSS called?
Distribution system (DS)
What does ESS stand for and what is it?
Extended Service Set
Multiple APs that are connected by a common switched infrastructure.
What does IBSS stand for and what is it?
Independent Basic Service Set
IBSS allows two or more wireless clients to communicate directly without an AP.
What is another name for IBSS?
Ad hoc network
What is the function of an AP configured for repeater mode?
It takes the signal it receives and repeats or retransmits it.
What does a workgroup bridge do?
Connects a device’s wired network adapter to a wireless network.
What are two types of workgroup bridges and how do they differ?
Universal workgroup bridge (uWGB - only allows a single wired device to be bridged - can associate with Cisco and non-Cisco access points)
Workgroup bridge (WGB - Cisco proprietary implementation that allows multiple wired devices to be bridged - only associate with Cisco access point)
How does a mesh network typically work?
Multiple AP leverage their dual radios to provide a wireless infrastructure. Clients may be associated using the 2.4GHz band while traffic is backhauled to APs with a wired infrastructure on the 5GHz bands.
