01. RIP
RIP-enabled routers discover the network by first sending a message requesting router tables from neighboring devices. Neighbor routers running RIP respond by sending the full routing tables back to the requestor, whereupon the requestor follows an algorithm to merge all of these updates into its own table. At scheduled intervals, RIP routers then periodically send out their router tables to their neighbors so that any changes can be propagated across the network.
Traditional RIP supported only IPv4 networks but the newer RIPng standard also supports IPv6. RIP utilizes either UDP ports 520 or 521 (RIPng) for its communication.
02. OSPF
OSPF-enabled routers discover the network by sending identification messages to each other followed by messages that capture specific routing items rather than the entire routing table. It is the only link state routing protocol listed in this category.
03. EIGRP and IGRP
EIGRP, designed with the goals of easier configuration and better performance than OSPF. supports classless IP subnets and improves the efficiency of the routing algorithms compared to older IGRP. It does not support routing hierarchies, like RIP. Originally created as a proprietary protocol runnable only on Cisco family devices
04. IS-IS
The Intermediate System to Intermediate System protocol functions similarly to OSPF. While OSPF became the more popular choice overall, IS-IS remains in widespread use by service providers who have benefitted from the protocol being more easily adaptable to their specialized environments. Unlike the other protocols in this category, IS-IS does not run over Internet Protocol (IP) and uses its own addressing scheme.
05. BGP and EGP
The Border Gateway Protocol is the Internet standard External Gateway Protocol (EGP). BGP detects modifications to routing tables and selectively communicates those changes to other routers over TCP/IP.
Internet providers commonly use BGP to join their networks together. Additionally, larger business sometimes also use BGP to join together multiple of their internal networks.
RIP-enabled routers discover the network by first sending a message requesting router tables from neighboring devices. Neighbor routers running RIP respond by sending the full routing tables back to the requestor, whereupon the requestor follows an algorithm to merge all of these updates into its own table. At scheduled intervals, RIP routers then periodically send out their router tables to their neighbors so that any changes can be propagated across the network.
Traditional RIP supported only IPv4 networks but the newer RIPng standard also supports IPv6. RIP utilizes either UDP ports 520 or 521 (RIPng) for its communication.
02. OSPF
OSPF-enabled routers discover the network by sending identification messages to each other followed by messages that capture specific routing items rather than the entire routing table. It is the only link state routing protocol listed in this category.
03. EIGRP and IGRP
EIGRP, designed with the goals of easier configuration and better performance than OSPF. supports classless IP subnets and improves the efficiency of the routing algorithms compared to older IGRP. It does not support routing hierarchies, like RIP. Originally created as a proprietary protocol runnable only on Cisco family devices
04. IS-IS
The Intermediate System to Intermediate System protocol functions similarly to OSPF. While OSPF became the more popular choice overall, IS-IS remains in widespread use by service providers who have benefitted from the protocol being more easily adaptable to their specialized environments. Unlike the other protocols in this category, IS-IS does not run over Internet Protocol (IP) and uses its own addressing scheme.
05. BGP and EGP
The Border Gateway Protocol is the Internet standard External Gateway Protocol (EGP). BGP detects modifications to routing tables and selectively communicates those changes to other routers over TCP/IP.
Internet providers commonly use BGP to join their networks together. Additionally, larger business sometimes also use BGP to join together multiple of their internal networks.
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