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Questions and Answers
In the context of 802.11, what does CSMA stand for?
In the context of 802.11, what does CSMA stand for?
- Clear-to-Send Multiple Access
- Carrier Sense Multiple Access (correct)
- Collision Sensing Multiple Allocation
- Controlled Subnet Management Approach
What is the main goal of the 802.11 CSMA/CA protocol?
What is the main goal of the 802.11 CSMA/CA protocol?
- To increase random backoff time
- To broadcast clear-to-send signals
- To sense channel idleness
- To avoid collisions (correct)
What type of frame does the base station transmit in response to a small request-to-send (RTS) packet from a sender in the 802.11 protocol?
What type of frame does the base station transmit in response to a small request-to-send (RTS) packet from a sender in the 802.11 protocol?
- Control frame
- Acknowledgement (ACK)
- Clear-to-Send (CTS) (correct)
- Data frame
What does the duration field in an 802.11 frame represent?
What does the duration field in an 802.11 frame represent?
In the 802.11 protocol, which MAC address is used only in ad hoc mode?
In the 802.11 protocol, which MAC address is used only in ad hoc mode?
What is the main purpose of rate adaptation in the 802.11 protocol?
What is the main purpose of rate adaptation in the 802.11 protocol?
What information does the beacon frame contain in 802.11 power management?
What information does the beacon frame contain in 802.11 power management?
What is the primary purpose of 802.15 personal area network (PAN)?
What is the primary purpose of 802.15 personal area network (PAN)?
In a wireless network infrastructure mode, how are mobiles connected to the wired network?
In a wireless network infrastructure mode, how are mobiles connected to the wired network?
What is the main characteristic of wireless network ad hoc mode?
What is the main characteristic of wireless network ad hoc mode?
What is the purpose of Code Division Multiple Access (CDMA) in wireless networks?
What is the purpose of Code Division Multiple Access (CDMA) in wireless networks?
What is the unlicensed spectrum range for IEEE 802.11 wireless LAN?
What is the unlicensed spectrum range for IEEE 802.11 wireless LAN?
How do hosts connect in the 802.11 LAN architecture infrastructure mode?
How do hosts connect in the 802.11 LAN architecture infrastructure mode?
What is the function of passive and active scanning methods in 802.11 networks?
What is the function of passive and active scanning methods in 802.11 networks?
What is the main purpose of handoff in a wireless network infrastructure mode?
What is the main purpose of handoff in a wireless network infrastructure mode?
What is the primary issue caused by the hidden terminal problem in wireless networks?
What is the primary issue caused by the hidden terminal problem in wireless networks?
What is the primary feature of IEEE 802.11 wireless LAN architecture?
What is the primary feature of IEEE 802.11 wireless LAN architecture?
What is the key function of CSMA/CA in IEEE 802.11 wireless LAN?
What is the key function of CSMA/CA in IEEE 802.11 wireless LAN?
What is the distinguishing feature of multiple hop networks in wireless taxonomy?
What is the distinguishing feature of multiple hop networks in wireless taxonomy?
What is a significant trend in wireless networks?
What is a significant trend in wireless networks?
Which element is responsible for sending packets between the wired network and wireless hosts in its 'area'?
Which element is responsible for sending packets between the wired network and wireless hosts in its 'area'?
What is the main function of a base station in a wireless network?
What is the main function of a base station in a wireless network?
What do wireless links typically connect?
What do wireless links typically connect?
What does the term 'wireless does not always mean mobility' imply?
What does the term 'wireless does not always mean mobility' imply?
What is the data rate for 802.11 wireless links?
What is the data rate for 802.11 wireless links?
What does a wireless host refer to in a wireless network?
What does a wireless host refer to in a wireless network?
What is the main challenge in handling the mobile user in wireless networks?
What is the main challenge in handling the mobile user in wireless networks?
What is an important role of the network infrastructure in a wireless network?
What is an important role of the network infrastructure in a wireless network?
Study Notes
- The text discusses various elements of wireless and mobile networks, including infrastructure and ad hoc modes, single and multiple hop networks, and wireless link characteristics.
- Wireless network infrastructure mode:
- Base station connects mobiles to wired network.
- Handoff allows mobile devices to change base stations and maintain connection.
- Wireless network ad hoc mode:
- No base stations, nodes only transmit to other nodes within link coverage.
- Nodes organize themselves into a network and route among themselves.
- Wireless network taxonomy:
- Single hop infrastructure networks: APs connect hosts to larger Internet.
- Multiple hop networks: hosts may have to relay through several wireless nodes to connect to larger Internet.
- Wireless network characteristics:
- Decreased signal strength due to path loss.
- Interference from other sources and multipath propagation.
- Hidden terminal problem: B, A and B, C cannot hear each other, causing interference.
- Code Division Multiple Access (CDMA):
- Unique codes assigned to each user.
- Multiple users can transmit simultaneously with minimal interference.
- IEEE 802.11 wireless LAN:
- 2.4-5 GHz unlicensed spectrum.
- Up to 54 Mbps in 802.11a, 54 Mbps in 802.11g, up to 200 Mbps in 802.11n.
- All versions use CSMA/CA for multiple access.
- 802.11 LAN architecture:
- Base station (access point) and wireless hosts communicate.
- In infrastructure mode, each BSS contains wireless hosts and an AP.
- Hosts must associate with an AP and perform authentication.
- 802.11: Channels, association:
- 11 channels at different frequencies for 802.11b.
- Hosts must associate with an AP and perform authentication.
- Passive and active scanning methods for joining an 802.11 network.
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Description
Test your knowledge on wireless and mobile networks with this quiz on wireless (mobile) phone subscribers, wireless Internet-connected devices, challenges in wireless communication, and handling mobile users.