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networking security high availability network network performance cisco network security router switch voice over ip voice over internet protocol network design lossless ubiquitous computing human computer interaction intelligent environments augmented reality pervasive computing hci ubiquitous codecs encoder video decode mpeg mp3 h.264 / mpeg4 avc mpeg4 divx x264 real video soren decoder text audio encode lossy encoding decoding codec voip phone context-aware pervasive systems profiling context awareness sentient computing ambient intelligence wireless ad-hoc network wearable computing mobile computing internet 2 internet2 vlan ip vtp subnet ipv6 fiber voip computer networks