Routing Protocols Flashcards
RIP
Router Information Protocol, not widely used. Interior gateway in autonomous system. Max hop count 15. Can be classful, only routing based on class system, or class-less and routes without any subnet mask. Interior Gateway Protocol
IGRP
Interior Gateway Routing Protocol, distance vector interior gateway protocol, not widely used anymore.
EIGRP
Enhanced Interior Gateway Routing Protocol. Interior gateway within autonomous system. Hybrid/Advanced distance vector, loop free. One of the most widely used protocols for interior gateway routing
Default metrics are bandwidth and delay
OSPF
Open Shortest Path First. Interior gateway w/ autonomous system protocol, link state. Link State. Metric: path cost
Link State
Autonomous System
Routers running the same Interior Gateway Routing Protocol are said to be in the same Autonomous system
Link-State
Find the path with the lowest costs between nodes, OSPF and IS-IS are examples of link state routing protocols
Distance Vector
Based on calculating the distance and direction (vector) to networks. Includes routing protocols like RIP, IGRP, and EIGRP
BGP
Border Gateway Protocol. Can be Exterior Gateway (outside autonomous system) or Interior Gateway (within autonomous system). Hybrid path vector and distance vector
EGP
Exterior Gateway Protocols, share routes between autonomous systems. Protocols include BGP and EGP (not used anymore.
AD Administrative Distance
A number used to rank directly connected routes, static routes and dynamic routes.
Uses numbers - to 255 with 0 being the most trust worthy
The most trusted route with the lowest AD distance will be chosen if there are multiple routes.
Static Routing
Manually configured routes. Sufficient in small networks.
Overrides dynamically learned routes. Not fault tolerant on its own
Dynamic Routing
Routing protocols that allow routers to dynamically learn and share routes with one another, and adds fault tolerance
Uses Interior Gateway Protocols (IGP) and Exterior Gateway Protocols (EGP)
