Flashcards in Chapter 10 - Supplement - Sheet1 Deck (46)
Interior Gateway Protocols. Used to exchange routing information with routers in the same autonomous sytem.
Autonomous system. Colection of networks under a common administrative domain.
Exeterior gateway protocols. Used to communicate between multiple autonomous systems
Two types of dynamic routing
Two types of IGP
Distance Vector, Link State
Administrative Distance. Used to rate the trustworthiness of routing information received on one router from its neighboring router. Integer from 0 - 255.
AD = 0
Most trusted route
AD = 255
Least trusted route. No traffic is allowed to be passed via this route.
Default AD of a connected interface
Default AD of a static route source
Default AD of EIGRP route source
Default AD of IGRP route source
Default AD of OSPF route source
Default AD of RIPv1 and RIPv2 route source
Default AD of external EIGRP route source
Default AD if route source is unknown
Distance Vector Protocols
Finds the best path to a remote network by judging distance in hops. Fewest hops = best route
Examples of vector protocols
RIP, RIPv2, Interior Gateway Routing Protocol (IGRP)
Link State Protocols
Classess protocol. Routers have three tables, 1 for directly attached neighbors, 1 for topology of entire internetwork, 1 is actual routing table. Has more information about a network than any distance vector protocol
Examples of link state protocols
OSPF and IS-IS
Routing by Rumor
Distance vector protocol has routers pass on their routing tables to their neighbors, which combine the data with their own table and pass that on to their neighbors. All routers believe the info without verification.
3 Metrics kept by converged routers
Remote network number, interface used to send packets, hop count to the network
Distance Vector protocol Routers are considered converged when their routing tables are complete
Distance vector protocol. Sends complete routing table every 30 seconds. Uses hop count.
Max allowable hop for RIP
Differences between RIPv1 and RIPv2
RIPv2 is classless (sends subnet info w/each update so can be used with devices on different subnets), uses multicase instead of broadcasts, supports VLSM networks, allows MD5 auth, supports discontiguous networks, RIPv1 sends broadcasts every 30 seconds. RIPv2 sends multicasts.
Variable length subnet masking. Allows for different subnet masks for different router interfaces.
Routers update without the subnet mask. For example, a network 172.16.0.0 could be 172.16.10.0/24 and another could be 172.16.20.0/24. With classful routing, the routers don't consider subnet mask, creating potential confusion.
Routers update with the subnet mask.