First Intermediate Host

intermediate host

intermediate host reservoir

intermediate node

second intermediate host

HN Host Node

host node

host node cycle

host-host layer

host-host layer (in DPA architecture)

intermediate system to intermediate system

Intermediate System-Intermediate System

intermediate system-to-intermediate system protocol

intermediate system-to-intermediate system(IS-IS)

intermediate frequency generating station at intermediate voltage

HHC Host – to – Host Connection

Host exchange， Host

host to host

host to host traffic