A "moderate" interpretation of the E2E argument is that, if hosts can implement

certain functionality correctly, then implement this functionality at lower layers only as

a performance enhancement, if doing so does not impose a burden on applications

that do not require it. Based on this interpretation, argue whether or not these

functionalities belong in the network:

-multicast

-routing

-quality of service (QoS)

-name resolution (DNS)

-web caches