1. Discussion Section Week 1 EE122: Introduction to Communication Networks Fall 2006

2. Delay and Bandwidth Delay Bandwidth HELLO H ELLO Transmit Time Speed of Light

3. Store and Forward There can be cut-through, but diverse reasons for store-and-forward –Example: screen bad words H E L LO Cut-through H E L LO Store-and-forward S U C 1. CESS2. *!

4. Store and Forward (Continued) H L EL O Propagation Delay Transmit Time H L EL O Propagation Delay Transmit Time H L EL O Latency = Propagation Delay 1 + Transmit Time 1 + Propagation Delay 2 + Transmit Time 2 + Queueing Delay RTT = Latency_Forward + Latency_Reverse