BB Net+ Ch10 Flashcards
What are the two types of routing protocols that are used in internetworks? Pg 299
Interior Gateway Protocols(IGPs) and Exterior Gateway Protocols(EGPs)
What are IGPs used for? Pg 299
Used to exchange routing information with routers in the same AS.
What is AS? Pg 299
Autonomous system, a collection of networks under a common administrative domain (all routers that share the same routing table information).
Describe AD and what it is used to determine. Pg 300
the Administrative Distance is an integer from 0 to 255 that is used to rate trustworthiness of a neighboring router where 0 is the most trusted and 255 is the least. A value of 255 essentially means that “no traffic is allowed to be passed via this route.”
If a router receives two updates to the routing table listing the same remote network, what other things does it check in order to decide which of the advertised routes to take? Pg 300
It will choose the route with the lower AD. If both the routes have the same AD it will look at metrics like hop count or the amount of bandwidth on the lines. If all the metrics and AD are the same then the router will load-balance to the remote network.
What is load balancing when determining the best routing path? Pg 300
Sending packets down each link to test for the best one to add to the router table.
What are the default administrative distances for static route, connected interface, and internal BGP? Pg 301-302
1, 0, and 200
T/F Even if you configure a static route, the router will still use the dynamic route by default. Pg 302
False. Static routes have a default AD of 1, thus are chosen by the router to be the best route unless the AD is changed.
What are some examples of distance routing protocols and how do they work? Pg 302
RIP, RIPv2, and Interior Gateway Routing Protocol (IGRP) are examples of distance vector protocols. Distance vector protocols find the best path to a remote network by judging distance.
What is another name of link state protocols? Describe the 3 routing tables that the routers create when using link state protocols and what are 2 complete link state protocols? Pg 302-303
AKA shortest path first protocols. One table keeps track of directly attached neighbors, one determines topology of the entire internetwork, and one is used as the actual routing table. OSPF and IS-IS are link state protocols.
What are some examples of hybrid protocols. Pg 303
EIGRP and BGP(EGP and iBGP)
What is routing by rumor? Pg 303
A router receives an update to their routing table from a neighboring router but trust the word of this router without verifying for itself.
