12. Wireless networking Flashcards
Which address should you ping when you want to verify whether a NIC card is working properly
the loopback address (127.0.0.1)
Which network configuration needs to be checked when you are not able to resolve a Web site by its URL, but you can browse the Internet by using IP addresses?
Domain Name System (DNS) server configuration
Which wireless mode requires that a wireless router is used
infrastructure mode
Which wireless mode allows devices to connect without the need of a wireless router
ad hoc mode
Which feature optimized network traffic on the network connection page
Quality of Service (QoS) Packet Scheduler
What is the purpose of MAC filtering on a wireless network
to prevent unauthorized devices from connecting to the wireless network
What is the purpose of Quality of Service (QoS)
It allows you to limit the bandwidth available for data based on the protocol used, the IP address, or other parameters
What must be different in the network configuration for each client if TCP/IP is used as the standard protocol
the IP address
Which component do you install in a computer to establish a phyiscal connection to the network media
Network Interface Card (NIC)
What does the aconym DMZ denote
demilitarized zone
What is the maximum transmission speed supported by 802.11b standard
11Mbps
What is the maximum transmission speed supported by 802.11g standard
54Mbps
What is the maximum transmission speed promised by 802.11n standard
600Mbps
What is the max transmission speed supproted by 802.11a
54Mbps
Which radio frequency band is used by microwaves and cordless telephones
2.4Ghz
Which Wi-Fi networking standards operate in the 5GHz frequency
- 802.11a
- 802.11ac
- 802.11n
Which three Wi-Fi networking standards operate within the 2.4 GHz radio frequency band
- 11b
- 11g
- 11n
At which band does Bluetooth technology operate
2.4GHz
ANT+
A 2.4 GHz radio protocol that operates at low speeds over distances up to 30 meters, and is used primarily to manage sensors such as fitness trackers, medical devices, and watches
Bluetooth
A standard designed for wireless PAN applications that operates in the same 2.4 GHz RF band used by Wi-Fi, and is commonly used to connect peripherals to computers and mobile devices
MIMO
Multiple-Input and Multiple-Output
Multiple-Input and Multiple-Output
A wireless technologu that uses multiple antennas to simultaneously transmit and receive separate data streams on the same channel
NFC
Near Feild Communication
Near Field Communication (NFC)
A set of standards used either for small amounts of data or else for configuration data that can bootstrap a faster bluetooth or WiFi Connection
RFID
Radio Frequency Identification
Radio Frequency Identification (RFID)
A technology that allows identification and communication between nodes using electromagnetic fields
Spread Spectrum
A wireless technology that breaks the transmission into a large number of subchannels on nearby frequencies
SSID
Service Set Identifier
Service Set Identifier (SSID)
A string of up to 32 octets that can be used to uniquely identify it to clients
WPS
Wi-Fi Protected Setup
Wi-Fi Protected Setup
A network security standard that allows non-technical users of home networks to easily control network access
MUMIMO
Multiple User MIMO
Multiple User Multiple Input Multiple Output
WLC
Wireless Lan Controller
Wireless Lan Controller (WLC)
a device that allows thin APs to be centrally managed , to share configuration data and function as a single layer network
WMN
wireless mesh network
wireless mesh network
- allows nodes to communicate and relay communications as peers rather than dividually connecting to a WAP as clients
- can also be used to join multiple compatible WAPs in a WiFi nework, giving the benefit of centrally managed APs, but with the extra benefit that not all APs need to have a connection to a wired internet
Z-Wave
- proprietary wireless standard maintained by Silicon Labs
- uses 800-900MHz ISM band
- 40knps over distances of 10-100m
- allows nodes to form a mesh network such that even if two nodes can’t directly communicate, they can relay data through intermediate nodes
- longer range than bluetooth with less power that WiFi.
- Commonly used for interoperable monitoring and remote control of home automation and lighting
ZigBee
- open standard based on IEE 802.15.4 PAN standards maintained by ZigBee Alliance
- uses a varierty of ISM bands, with 2.5Ghz and 915Mhz being the most common
- similar features and applications to Z-Wave
- Zigbee devices are available from more manufactures, but are also prone to compatibility issues
- allows nodes to form a mesh network such that even if two nodes can’t directly communicate, they can relay data through intermediate nodes
- longer range than bluetooth with less power that WiFi.
- Commonly used for interoperable monitoring and remote control of home automation and lighting
ISM band
Industrial, scientific and Medical Band
WEP
Wired Equivalent Privacy
Wired Equivalent Privacy (WEP)
- part of the original Wi-Fi standard
- Used RC4 encryption cipher
- Used 40bit key (WEP 128 used an effective 104 bit key)
- Flaws made it easy to compromise (in seconds)
- Removed from WiFi standard in 2004
WPA
- Wi-Fi Protected Access
- was in draft 802.11i standard, but rushed forward due to issues with WEP
- encrypts using Temporal Key Integrity Protocol
- 128bit
- each data packet sent using its own key
WPA2
- final version of WPA
- based on final 802.11i standard
- mandatory support for 128bit encryption
- uses Advance Encryption Standard (AES) cipher
Wi-Fi strongest security(high to low)
- WPA2 with AES
- WPA with AES
- WPA2 TKIP
- WPA TKIP
- WEP
- Nothing
