OBJ 2.2 X Flashcards
Dynamic routing
▪ More than one route can exist for a network
▪ Different protocols consider different criteria when deciding which route
to give preference
▪ Based on number of hops (hop count in RIP), link bandwidths (OSPF), or
other criteria
Routing Internet Protocol (RIP)
▪ Interior Gateway Protocol
▪ Distance-vector protocol using hop count
▪ Maximum hops of 15, 16 is infinite
▪ Oldest dynamic routing protocol, provides updates every 30 seconds
▪ Easy to configure and runs over UDP
Open Shortest
Path First (OSPF)
▪ Interior Gateway Protocol
▪ Link-state protocol using cost
▪ Cost is based on link speed between routers
Enhanced Interior Gateway Routing Protocol
(EIGRP)
▪ Interior Gateway Protocol
▪ Advanced distance-vector protocol using bandwidth and delay making it
a hybrid of distance-vector and link-state
▪ Proprietary Cisco protocol that is popular in Cisco-only networks
Border Gateway
Protocol (BGP)]
▪ External Gateway Protocol
▪ Path vector using the number of autonomous system hops instead of
router hops
▪ Widespread utilization, this protocol runs the backbone of the Internet
▪ Does not converge quickly, though, when the topology changes
Link state vs. distance
vector vs. hybrid
Communicates whether a given interface has a cable connected to it and
a valid protocol to use for communication
Static routing
● Manually configured by an administrator
● Default static route (0.0.0.0/0) is a special case
o “If I don’t know where, then send out default static route.”
Default route
▪ Route that takes effect when no other route is available for an IP
destination address
Administrative distance
Index of believability. If a route has a lower the administrative distance (AD), the route is more
believable
Exterior vs. interior
Interior Gateway Protocols (IGP)
● Operate within an autonomous system
Exterior Gateway Protocols (EGP)
● Operated between autonomous systems
Time to live
Traffic shaping
