Wireless Challenges(review) Need to share airwaves rather than wire Dont know what hosts are involved Host may not be using same link technology No fixed topology of interconnection ·| nterference Other hosts: collisions, capture, interference The environment(e.g, microwaves+ 802. 11) Mobility - Things change often Environmental changes do too How do microwaves work? Relate to 802. 11 absorption Other characteristics of wireless Noisy→ lots of losses ·S|ow Multipath interference Lecture25:11-302006 3Lecture 25:11-30-2006 3 Wireless Challenges (review) • Need to share airwaves rather than wire • Don’t know what hosts are involved • Host may not be using same link technology • No fixed topology of interconnection • Interference • Other hosts: collisions, capture, interference • The environment (e.g., microwaves + 802.11) • Mobility -> Things change often • Environmental changes do too • How do microwaves work? Relate to 802.11 absorption. • Other characteristics of wireless • Noisy → lots of losses • Slow • Multipath interference