Answer Posted / ashok kumar

BGP - When u have multiple ISP connection on same router it
will perform as loadbalancing and its coonect different
AS ,its slow convergence compare to OSPF and IGRP . it
using the TCP port-179 to exchange packets with neighbor.
Medium to Big Organisation

OSPF - OSPF is fast convergence link state routing
protocol, whcih connect different area with area0, where
area0 is core router. ABR and ASBR are connected to
Area0.its uses own L4 protocol to send hello packet. small
to meduim organisation

IGRP - Its a link-state cisco proprietry routing protocol.
where multi vendor product is not supported. its useful for
small to medum organisation.

Static route - Its best route path defined by network admin
for very small organisation , where n/w traffic will send
to remote n/w faster.

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