7 - WLANs Flashcards
1
Q
What are three advantages of Wireless LAN?
A
- Convenient
- Fast installation
- User mobility
2
Q
What are three disadvantages of Wireless LAN?
A
- Small bandwidth
- Interference/noise
- Broadcast medium can be intercepted
3
Q
What is a LAN?
A
A low cost, high speed local area network, with almost error-free communications.
4
Q
What are the two modes in WLAN Architecture?
A
- BSS (basic service set)
- Ad hoc network
5
Q
What is an ESS?
A
Extended service set, formed by interconnecting BSSs via a distribution system.
6
Q
What are some advantages to the infrared physical layer?
A
- Simple and inexpensive
- Constrained by walls, secured against eavesdropping
7
Q
What are some disadvantages against the infrared physical layer?
A
- Interference from sunlight, indoor lighting
- Limited range
8
Q
Why not use CSMA-CD in WLANs?
A
- Collision detection problem is half duplex and is therefore unable to transmit and sense simultaneously
- Hidden station problem
