0. Logistics:
    --> Google hiring in networking
    --> Only 18 of you have started assignment 2 (and there's a midterm to prepare for).
1. Inter vs. intra-domain routing
    --> AS-level path vs. router level path
    --> Business interests (local preference) vs. user experience (path metric)
    --> Reachability vs. optimality.
2. Inter-domain routing: the border gateway protocol
    --> Protocol between different border gateways. Aside: what does the border gateway protocol use for communication?    --> eBGP: exchanging information between domains
    --> iBGP: propagation this information within a domain
3. Choosing between alternate paths
    --> Mechanism: local preference
    --> Policy governed by business relationships: Peering vs. transit
    --> How peering vs. transit affects local preference.
        --> Example 1: Toy example using lecture notes
        --> Example 2: Boomerang routing
4. Historical notes (if time permits)
    --> Flattening of the Internet
    --> YouTube outage