Section 6 Chapter 34 - Wireless Networking, CSMA and SSID

Question 1

Wi-Fi

Answer 1

A local area wireless technology that allows a device to connect to the internet via a WAP

Question 2

Station

Answer 2

A combination of a computer and a wireless network interface controller.

Multiple stations share the same frequency channel

Question 3

Wireless network interface controller

Answer 3

A network interface card with wireless capabilities

Question 4

What is needed to connect to a wireless network (2)

Answer 4

• Wireless Network Interface Controller

- Wireless Access Point

Question 5

How does a WAP connect to the internet

Answer 5

With a router

Question 6

What does SSID stand for

Answer 6

Service Set IDentifier

Question 7

SSID

Answer 7

The informal ‘name’ of the network which can be used to identify it

Question 8

How to protect a wireless network (3)

Answer 8

• WPA or WPA2
• MAC whitelist
• SSID broadcast disabled

Question 9

What does CSMA/CA stand for

Answer 9

Carrier Sense Multiple Access with Collision Avoidance

Question 10

CSMA/CA

Answer 10

A protocol in which a node listens to the channel and waits until it is idle before transmitting it’s data. If the channel is active it waits a random amount of time before checking again.

Question 11

How to counteract the problem of hidden nodes

Answer 11

RTS/CTS (Request to send / Clear to send)

Question 12

RTS/CTS

Answer 12

Once the channel is idle the node transmits a RTS. If it then receives a CTS back it then sends its data

Question 13

Purpose of an SSID

Answer 13

It is usually a human readable string that acts as an informal name for the network so that it can be told apart from other networks