Name:_____________________________________________
CNI Quiz #7
Graded By:______________________________________________
1.
Define what split horizon means. Does this apply to both distance vector and link state algorithms?
Answer: Routing updates sent out an interface do not contain routing information about subnets learned
from updates entering the same interface. This is only used with distance vector routing protocols.
2.
Name three features of RIPv2 that are not features of RIPv1.
Answer: subnet masks (VLSM), authentication, next hop router IP addresses in routing update, external
route tags, and mulicast routing updates
3.
List the interior IP routing protocols that have autosummarization enabled by default.
Answer: RIPv1, IGRP, EIGRP, RIPv2.
4.
Describe the purpose and meaning of route poisoning.
Answer: Distance vector routing protocol feature in which a newly bad route is advertised with an infinite
metric. Routers receiving this information then can mark the route as a bad route immediately. Prevents
routing loops.
5.
Describe the meaning and purpose of triggered updates.
Answer: update sent immediately when new routing information is learned rather than waiting on a timer.
6.
List the 5 components of an IGRP route metric.
Answer: bw, delay, reliability, load, MTU.
7.
How often does RIP send updates by default? IGRP?
Answer: RIP- 30 seconds, IGRP 90 seconds.
8.
In RIP, if route updates are not received for a network, how long before the routes are considered
invalid by default?
Answer: 180 seconds
9.
Of the following routing protocols which support VLSM – RIPv1, RIPv2, IGRP, EIGRP, OSPF
Answer: OSPF, EIGRP, RIPv2
10. When a route is marked as invalid, what prevents the route from being reinserted into the routing
table?
Answer: hold down timer
Bonus Questions
1.
Define administrative distance.
Answer:
Two different routing protocols may have a route to the same destination. Cisco routers assign each
routing protocol an administrative distance. If 2 or more protocols have routes to the same destination, the
protocol with the lowest administrative distance will be used.
2.
Given the IP address 140.1.1.1 and mask of 255.255.255.248, what is the broadcast address?
Answer: 140.1.1.7
3.
Given the IP address 200.1.1.130 and the mask 255.255.255.224 what are the assignable IP addresses
in this subnet?
Answer: 200.1.1.129 – 200.1.1.158.