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ICND1 – IP Routing 4

June 14th, 2017 in ICND1 100-105 Go to comments

Note: The ICND1 exam requires candidates to understand basic knowledge of dynamic routing protocols (RIP, EIGRP, OSPF).

Question 1

Question 2

Question 3


A and E are correct according to the theory of RIP.

RIP version 1 updates are broadcasts, and RIP version 2 updates are multicast to -> B is not correct.

RIP v1 is a classful routing protocol but RIP v2 is a classless routing protocol -> C is correct.

RIPv1 and RIPv2 have the same default administrative distance of 120 -> D is not correct.

RIPv2 is a classless routing protocol so it does send the subnet mask in updates -> F is not correct.

Question 4


Host1 can ping the Serial interface of R2 because R1 has the network of as directly connected route. But R1 does not know how to route to the network of Host2 ( so R1 will drop that ping without trying to send it out S0/0 interface. To make the ping work, we have to configure a route pointing to that network (for example: ip route s0/0 on R1).

Question 5


The route currently has the metric of 15 so this router will add 1 hop count before sending out to its neighboring router. With RIP, a metric of 16 means that network is down -> it will not be installed in the routing table of the neighboring router.

Question 6

Question 7


The passive interface only prevents routing updates from being sent and received on that interface. It does not affect the default route. But if we configure a default route like this:

Router(config)#ip route

Then if the next-hop address is down (unreachable) then this default route would be removed from the routing table.

Question 8

Question 9

Comments (1) Comments
  1. Anonymous
    August 18th, 2017

    There is a question in http://www.9tut.net/final_flash/ICND1v3/All_Questions_3/quiz.html
    (Question 11)
    Which information is used to install the best route to a destination in IP routing table?
    a: the Predix Length
    b: the interface number
    c: the autonomous system
    d: the tunnel ID.
    the correct answer from the quiz is a: the prefix length.

    however, my understanding is: prefix length decided the network mask, like /24 is the

    why not the answer b? my understanding is:
    after configured, each interface has its IP address. the router will know which interface to send out the packet.