The New Campus Model
11
Multiprotocol support
Campus networks must support multiple proto-
cols, both routed and routing protocols. Routed protocols are used to
send user data through the internetwork (for example, IP or IPX). Rout-
ing protocols are used to send network updates between routers, which
will in turn update their routing tables. Examples of routing protocols
include RIP, Enhanced Interior Gateway Routing Protocol (EIGRP), and
Open Shortest Path First (OSPF).
Multicasting
Multicasting is sending a broadcast to a defined subnet or
group of users. Users can be placed in multicast groups, for example, for
videoconferencing.
Network Services
The new campus model provides remote services quickly and easily to all
users. The users have no idea where the resources are located in the internet-
work, nor should they. There are three types of network services, which are
created and defined by the administrator and should appear to the users as
local services:
Local services
Remote services
Enterprise services
Local Services
Local services
are network services that are located on the same subnet or
network as the users accessing them. Users do not cross layer 3 devices and
the network services are in the same broadcast domain as the users. This type
of traffic never crosses the backbone.
Remote Services
Remote services
are close to users but not on the same network or subnet as
the users. The users would have to cross a layer 3 device to communicate
with the network services. However, they might not have to cross the
backbone.
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