10 - Advanced Routing Concepts

Question 1

What are the three common characteristics of dynamic routes?

Answer 1

IGP or EGP
classful or classless routing updates
distance-vector or link state routing protocols

Question 2

What is the collection of all networks managed by a single organization?

Answer 2

Autonomous System

Question 3

What are IGPs?

Answer 3

routing protocols that dynamically share routing information within an AS

Question 4

What are EGPs?

Answer 4

routing protocols that dynamically share routing information between multiple ASs

Question 5

What are the common IGPs in todays networks?

Answer 5

RIP
EIGRP
OSPF

Question 6

What are the common EGPs in today network?

Answer 6

BGP

Question 7

What do classful routing protocols do?

Answer 7

1. transmit network addresses but not subnet masks

2. automatically summarize networks on their classful bit boundaries

Question 8

What do classless routing protocols do?

Answer 8

1. transmit network addresses and subnet masks

2. enables the use of VLSMs

Question 9

What happens when ip classless is disabled on a router?

Answer 9

Disables the support of vlsm on classless routing protocols

Question 10

Is ip classless enabled by default?

Answer 10

yes

Question 11

What is an example of distance-vector routing protocol?

Answer 11

RIP

Question 12

What is an example of link-state routing protocol?

Answer 12

OSPF

Question 13

What is an example of a hybrid routing protocol?

Answer 13

EIGRP

Question 14

Routers that run distant-vector routing protocol exchange routing updates with ______________?

Answer 14

directly connected neighbors

Question 15

Routers that use link-state routing protocol flood the network with ___________ packets every time a topology change occurs?

Answer 15

LSA or link state advertisements

Question 16

What algorithm is used by RIP?

Answer 16

Bellman Ford

Question 17

What metric is used by RIP?

Answer 17

hop count

Question 18

What is the hop count limit for RIP?

Answer 18

15

Question 19

What is the default timer for RIP to send advertisements?

Answer 19

30 seconds

Question 20

What mechanisms does RIP use to prevent loops?

Answer 20

split horizion
poison reverse
hold-down timers
triggered updates

Question 21

What is the default time for the hold-down timers?

Answer 21

60 seconds

Question 22

What version of RIP is classless?

Answer 22

version 2

Question 23

What version of RIP is classful?

Answer 23

version 1

Question 24

What is shown in the output of show ip protocols?

Answer 24

How frequently routing updates are sent
which networks are being advertised
whether automatic summarization is enabled

Question 25

What are the four timers of RIP?

Answer 25

routing updates- every 30 seconds Invalid- every 180 seconds hold-down- every 180 seconds flush-every 240 seconds

Question 26

How do you modify the timers in RIP?

Answer 26

using the timers basic 30 180 180 240

Question 27

What are the best practices for modifying the timers in RIP?

Answer 27

the invalid and hold-down timers should be three times the value of the update timer, the flush timer should be greater than the sum of the update timer and the hold down timer

Question 28

How do you modify the RIP timers for a particular interface?

Answer 28

ip rip advertise

Question 29

How do you determine the configuration of automatic summarization on a router for RIP?

Answer 29

show ip rip database

Question 30

can you disable automatic summarization in RIP version 1?

Answer 30

no

Question 31

How do you disable automatic summarization in RIP version 2?

Answer 31

no auto-summary in RIP router configuration mode

Question 32

How do you inject a default route into RIP?

Answer 32

default-information originate command

Question 33

Where do you use the default-information originate command?

Answer 33

only on the router that has been configured with the default route

Question 34

What is the passive-interface default command used for in RIP?

Answer 34

Is used to prevent interfaces from participating in RIP advertisements. You have to issue the no passive-interface fa0/0 command to allow updates on that interface. You could also just issue the passive-interface fa0/0 command to keep that one interface from participating in RIP

Question 35

How do you determine a route in the routing table is a rip route?

Answer 35

R preceeds the route in the routing table

Question 36

What command is used to determine rip is receiving routes?

Answer 36

show ip rip database