Give a "count-to-infinity" scenario involving three routers that can't be solved by the poison reverse approach.

1) In class, we mainly focused on wide area multicast algorithms, and ignored some interesting details like multicast addressing and Ethernet multicast. Please do some independent reading, and answer the following
questions:
a) What defines an IP multicast address? What is the scope of such an
address?
b) What prevents two different IP multicast groups (or applications) from
picking the same multicast address?
c) Ethernet is a pervasive link technology, and it has native support for
multicast.
- Given an IP multicast address, how is the corresponding Ethernet
multicast address determined? What is the advantage of such an address
mapping technique?
- Discuss how IGMP works to maintain multicast group membership in a
broadcast LAN, including Ethernet.
- Describe how an Ethernet multicast packet can be correctly delivered to
all the subscribing interfaces without transmitting multiple copies of
the packet.

2) (a) Describe how loops in paths can be detected in BGP. (b) What is AS path prepending? How can it be used for the purpose of traffic engineering?

3) K & R, Chapter 4, Problems 32, 34.

4) K & R, Chapter 5, Problems 5, 11, 13.