+------------------------------------+ Interest | +------+ +------+ +------+ | +-----+ +-+ ---->| CS |---->| PIT |---->| FIB |--------->| CDN | | | | +------+ +------+ +------+ | +-----+ +-+ | | Add | Drop | | Forward MT <--------+ Intf v Nack v | Data | | +------------------------------------+ +------------------------------------+ +-+ | Forward +------+ | +-----+ | | <-------------------------------------| PIT |<---------| CDN | +-+ | | Cache +--+---+ | Data +-----+ MT | +--v---+ | | | | CS | v | | +------+ Discard | +------------------------------------+