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Questions and Answers
In the context of 802.11, what does CSMA stand for?
What is the main goal of the 802.11 CSMA/CA 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?
What does the duration field in an 802.11 frame represent?
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In the 802.11 protocol, which MAC address is used only in ad hoc mode?
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What is the main purpose of rate adaptation in the 802.11 protocol?
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What information does the beacon frame contain in 802.11 power management?
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What is the primary purpose of 802.15 personal area network (PAN)?
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In a wireless network infrastructure mode, how are mobiles connected to the wired network?
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What is the main characteristic of wireless network ad hoc mode?
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What is the purpose of Code Division Multiple Access (CDMA) in wireless networks?
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What is the unlicensed spectrum range for IEEE 802.11 wireless LAN?
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How do hosts connect in the 802.11 LAN architecture infrastructure mode?
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What is the function of passive and active scanning methods in 802.11 networks?
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What is the main purpose of handoff in a wireless network infrastructure mode?
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What is the primary issue caused by the hidden terminal problem in wireless networks?
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What is the primary feature of IEEE 802.11 wireless LAN architecture?
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What is the key function of CSMA/CA in IEEE 802.11 wireless LAN?
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What is the distinguishing feature of multiple hop networks in wireless taxonomy?
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What is a significant trend in wireless networks?
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Which element is responsible for sending packets between the wired network and wireless hosts in its 'area'?
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What is the main function of a base station in a wireless network?
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What do wireless links typically connect?
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What does the term 'wireless does not always mean mobility' imply?
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What is the data rate for 802.11 wireless links?
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What does a wireless host refer to in a wireless network?
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What is the main challenge in handling the mobile user in wireless networks?
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What is an important role of the network infrastructure in a wireless network?
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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.