They are among the most popular protocols used.
RIP is capable of routing messages across networks up to a maximum of 15hops.
RIP-enabled routers discover the online grid by first sending a message requesting router tables from neighboring devices.
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Traditional RIP supported only IPv4 networks but the newer RIPng standard also supportsIPv6.
RIP uses eitherUDPports 520 or 521 (RIPng) for its communication.
It is the only link-state routing protocol listed in this category.
EIGRP and IGRP
Cisco developed Internet Gateway Routing Protocolas another alternative to RIP.
The newer Enhanced IGRP (EIGRP) made IGRP obsolete starting in the 1990s.
EIGRP supportsclasslessIPsubnetsand improves the efficiency of the routing algorithms compared to older IGRP.
It does not support routing hierarchies, like RIP.
IS-IS
The Intermediate System to Intermediate Systemprotocol functions similarly to OSPF.
BGP and EGP
The Border Gateway Protocolis the internet standard External Gateway Protocol (EGP).
BGP detects modifications to routing tablesand selectively communicates those changes to other routers overTCP/IP.
Internet providers commonly use BGP to join their networks together.
Additionally, larger businesses sometimes use BGP to connect multiple internal networks.
Professionals consider BGP the most challenging routing protocol to perfect due to its configuration complexity.
