The catchment population is, at any given time, the totality of those in the âwere -wouldâ state of: were the. illness now to occur, it would be âcaughtâ by that case identification scheme [Source: Miettinen OS, 2007] Study base , a. series of person-.
A tier 1 network is an Internet Protocol (IP) network that participates in the Internet solely via settlement-free interconnection, also known as settlement-free peering.y the strict definition of peering and the strict definition of a tier 1 network, a tier 1 network only peers with other tier 1 networks and has no transit routes going anywhere.
Client/Server and Peer-to-Peer LANs. A client/server LAN, sometimes called a two-tier LAN, is made up of powerful computers, known as servers, given the task of managing disk drives, printers and network traffic. The clients in this type of LAN are the personal computers, or workstations, that run applications.