Chapter 13

13.1	We said that hosts schedule IGMP reports with random delays. How can the hosts on a LAN try to ensure that no two hosts generate the same random delay?
A:	Use some host-unique value when generating the random value. The IP address and link-layer address are two values that should differ on every host. The time-of-day is a bad choice, especially if all the hosts run a protocol such as NTP to synchronize their clocks.
13.2	In [Casner and Deering 1992] they mention that UDP lacks two features needed for sending audio samples across the MBONE: detection of packet reordering and detection of duplicate packets. How could you add these capabilities above UDP?
A:	They added an application protocol header that included a sequence number and a timestamp.