7 - WLANs Flashcards Preview

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Flashcards in 7 - WLANs Deck (8):
1

What are three advantages of Wireless LAN?

- Convenient
- Fast installation
- User mobility

2

What are three disadvantages of Wireless LAN?

- Small bandwidth
- Interference/noise
- Broadcast medium can be intercepted

3

What is a LAN?

A low cost, high speed local area network, with almost error-free communications.

4

What are the two modes in WLAN Architecture?

- BSS (basic service set)
- Ad hoc network

5

What is an ESS?

Extended service set, formed by interconnecting BSSs via a distribution system.

6

What are some advantages to the infrared physical layer?

- Simple and inexpensive
- Constrained by walls, secured against eavesdropping

7

What are some disadvantages against the infrared physical layer?

- Interference from sunlight, indoor lighting
- Limited range

8

Why not use CSMA-CD in WLANs?

- Collision detection problem is half duplex and is therefore unable to transmit and sense simultaneously
- Hidden station problem