Wireless Networks [AS Level]

To access a wireless network, a device needs a wireless ___ connected to or built into it.

Imagine you are at a coffee shop and you want to connect your mobile device to the shop's Wi-Fi network. Which of the following pieces of information would you need?

• The shop's SSID and IP address

• The shop's SSID and Pre-Shared Key

• The IP address and Subnet mask of the shop's network

• The DNS and default gateway of the shop's network

WiFi is a facility allowing computers, smartphones, or other devices to connect to the internet or​ (a)   with one another ​ (b)   within a ​ (c)   area.

• communicate
• wirelessly
• particular
• large
• privately

Which of the following is needed to connect to a wireless network?

• NIC

• Ethernet Cable

• WAP

• Switch

• Router

An SSID identifies each network by a ​ (a)   name; it must be used by all devices on that ​ (b)   . It can be set manually or (c)   and can be hidden to make it harder to ​ (d)   . Finally, it can be set to ​ (e)   to wireless devices in range of an access point.

• unique
• network
• automatically
• detect
• broadcast
• identify
• transmit
• LAN
• specific

Match the following terms with their definition

• Wireless Access Point

• NIC

• Network Interface Card

• WPA/WPA2

• Encryption methods

• SSID

• The unique name of a network

• WAP

When you want to ​ (a)   to a ​ (b)   and select a ​ (c)   , you will be asked for a ​ (d)   or security key.

• connect
• network
• SSID
• password
• encryption key
• join
• LAN
• network name

Using CSMA/CA ​ (a)   are avoided by each station ​ (b)   only when the channel is ​ (c)   . The improved version is CSMA/CA using ​ (d)   which sends a request to transmit and awaits a message telling the node that the channel is ​ (e)   .

• collisions
• transmitting
• idle
• RTS & CTS
• clear
• empty
• sending
• WTS & RTS

Wireless networks can be secured using:

• SSID hiding

• MAC Address whitelists

• Encryption

• IP address whitelists

• User account control

The problems that can occur when ​ (a)   or more devices are transmitting over a wireless network can be described as the ​ (b)   node problem. This is when the ​ (c)   is at the centre of the ​ (d)   and the other nodes cannot see each other so the WAP becomes overloaded with ​ (e)   .

• two
• hidden
• WAP
• network
• traffic
• one
• secret
• router
• requests