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ICND2 – IP Routing Questions

October 16th, 2017 in ICND2 200-105 Go to comments

Question 1

Explanation

Host Z will use ARP to get the MAC address of the interface on R1 that connects to it and use this MAC as the destination MAC address. It use the IP address of the storage server as the destination IP address.

For example in the topology below, host A will use the MAC address of E0 interface of the router as its destination MAC address to reach the Email Server.

destination_addresses.jpg

Question 2

Explanation

Static routes remain in the routing table even if the specified gateway becomes unavailable. If the specified gateway becomes unavailable, you need to remove the static route from the routing table manually. However, static routes are removed from the routing table if the specified interface goes down, and are reinstated when the interface comes back up.

Therefore the static route will only be removed from the routing table if the S0/0 interface on RTA is shutdown.

(Reference: http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/route_static.html)

Question 3

Question 4

Explanation

By default a static route has the Administrative Distance (AD) of 1, which is always preferred to dynamic routing protocols. In some cases we may want to use dynamic routing protocols and set static routes as a backup route when the “dynamic” routes fail -> we can increase the AD of that static route to a higher value than the AD of the dynamic routing protocols.

Question 5

Question 6

Explanation

Discontiguous networks are networks that have subnets of a major network separated by a different major network. Below is an example of discontiguous networks where subnets 10.10.1.0/24 and 10.10.2.0/24 are separated by a 2.0.0.0/8 network.

EIGRP_discontiguous_network_1.jpg

If we configure automatic summarization at classful boundaries, users on network 10.10.1.0/24 cannot communicate with users on network 10.10.2.0/24.

If you are not clear about automatic summarization please read the last part of this tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial.

Question 7

Explanation

Static routing can only be configured for each route manually so it is more secure than dynamic routing which only needs to declare which networks to run -> A is correct.

Also static route does not use any complex algorithm to find out the best path so no routing updates need to be sent out -> reduce routing traffic load. Static routing is useful especially in stub network links.

Note: Stub network (or stub router) is used to describe a network (or router) that does not have any information about other networks except a default route. This type of network (or router) usually has only one connection to the outside.

Question 8

Explanation

Host1 can ping the Serial interface of R2 because R1 has the network of 192.168.1.4/30 as directly connected route. But R1 does not know how to route to the network of Host2 (192.168.1.128/26) 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 192.168.1.128 255.255.255.192 s0/0 on R1).

Question 9

Question 10

Comments (11) Comments
  1. NFK
    April 20th, 2017

    Why would the answer to question 2 not be B? If the interface is shut down as the question said, I thought the route is removed until the interface is reinstated. In that case, why wouldn’t RTA just drop the packet because it would not have the route from RTB anymore?

  2. NFK
    April 20th, 2017

    Nevermind, I just realized the error in my thinking.

  3. Sunset
    May 22nd, 2017

    can someone elaborate the answer to question 9?

  4. besti
    July 14th, 2017

    is this still updated?

  5. s3xs1
    July 19th, 2017

    Question 9

    A. It discards the packet.

    If the router has the default gateway defined, then this route will also be present in the routing table, thus by saying that this destination network is missing from the routing table would imply answer A, since the router sends an icmp message for the source and drops the package.

  6. paradise
    August 7th, 2017

    I do not understand why at question 9 the answer is C.
    We don’t know if there is configure a default route or not. I think is not configured. So, if there is no default route, the correct answer is A. If the default route was configured, then yes, answer C is correct.
    At the second thought … I really don’t know what is the correct answer. :))

  7. Paz
    August 30th, 2017

    9tut Please answer the question 9
    I think that the answer is A->”It discards the packet” because not in any time the default route is configured and i think the question is talk usually about on the default case

  8. 9tut
    September 3rd, 2017

    @Paz: We are not sure about Q.9 either as Cisco did not indicate if there is a default route configured or not.

  9. Alexis
    September 15th, 2017

    please what do they mean by configure a static route using an intermediate address

  10. sunrise
    September 19th, 2017

    The answer to question# 9 is A

  11. CCNA Test Taker
    November 13th, 2017

    Personally I think Q. 9 is a bit of a trick question. It states, “whose destination network is missing”. To me this means there is no configuration whatsoever in the routing table, including default route, that tells the packet where to go. In that case it would be discarded. If there were a default route, then yes, it would be sent to default route. You can’t presume anything into the question if it isn’t stated in the question.