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IP Routing

May 12th, 2017 Go to comments

Question 1

Explanation

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below:

EIGRP_Administrative Distances_popular_routing_protocols.jpg

Question 2

Explanation

The simple syntax of static route:

ip route destination-network-address subnet-mask {next-hop-IP-address | exit-interface}
+ destination-network-address: destination network address of the remote network
+ subnet mask: subnet mask of the destination network
+ next-hop-IP-address: the IP address of the receiving interface on the next-hop router
+ exit-interface: the local interface of this router where the packets will go out

In the statement “ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1″:

+ 192.168.0.0 255.255.240.0: the destination network
+ GigabitEthernet0/1: the exit-interface

Question 3

Question 4

Explanation

The static routing specifies a fixed destination so it is “consistent”. It is best used for small-scaled places where there are a few routers only. When links fail, static route cannot automatically find an alternative path like dynamic routing so routing is disrupted.

Question 5

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 6

Explanation

The Administrative Distance (AD) of popular routing protocols is shown below. You should learn them by heart:

EIGRP_Administrative Distances_popular_routing_protocols.jpg

Note: The AD of iBGP is 200

The smaller the AD is, the better it is. The router will choose the routing protocol with smallest AD.

In this case EIGRP with AD of 90 is the smallest one.

Question 7

Question 8

Question 9

Explanation

The Layer 2 information (source and destination MAC) would be changed when passing through each router. The Layer 3 information (source and destination IP addresses) remains unchanged.

Question 10

Question 11

Comments (23) Comments
  1. Ppetro
    February 7th, 2017

    Question 9 – correct answer is B. Router works in layer 3 and makes changes in Layer 3 IP address.
    In question we can find word ” packet ” so for me is also a tip which indicates B as correct answer

  2. Tepi
    February 8th, 2017

    Q9 .. the question is not well worded. I think it is using “packet’ in its general sense (datagram) so answer A would be correct (Layer 2 frame header and trailer). Also the router does not “replace the Layer 3 IP address” – the IP address of the packet is untouched.

  3. Tepi
    February 8th, 2017

    Q8 … “Which component of a routing table entry represents the subnet mask?” The routing table does not mention the network mask only the prefix .. so I think B is the correct answer ?

    10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
    C 10.0.0.0/30 is directly connected, GigabitEthernet0/0
    L 10.0.0.1/32 is directly connected, GigabitEthernet0/0
    192.168.0.0/24 is variably subnetted, 4 subnets, 2 masks
    C 192.168.0.0/28 is directly connected, Loopback0
    L 192.168.0.1/32 is directly connected, Loopback0
    C 192.168.0.48/28 is directly connected, Loopback1
    L 192.168.0.49/32 is directly connected, Loopback1

  4. Ppetro
    February 8th, 2017

    @Tepi – I read this question once again and… yeap – you have right. Correct answer is A.
    I thought is a tricky question :P

  5. Ppetro
    February 8th, 2017

    @Tepi – I believe you have right regarding to Q8 – correct answer should be B

  6. Star
    February 21st, 2017

    Regarding Q8 . I agree with @Tepi it should be B

  7. Anonymous
    March 2nd, 2017

    Where are question?

  8. jasin
    March 8th, 2017

    hi basically when you click on link to check your knowledge that time it show only 4 questions on this particular tab ip- routing check it out thanks

  9. Yo
    March 11th, 2017

    Yep, that’s what I thought guys, question 8 should be B, but maybe we’re missing something. Can anyone correct us and explain if we’re wrong? Thank you..

  10. AS1997
    March 20th, 2017

    im a premium member and when i click on the link for the questions there are only four questions coming up while there is 15 questions on the 9tut for ip routing is there any specific reason for this 9tut???

  11. Mhnd85
    March 20th, 2017

    The same question has been asked from AS1997

  12. hjkgjk
    March 29th, 2017

    kkjbkjbkj

  13. daheraya
    March 29th, 2017

    fix Q8 should be B

  14. Anymous777
    May 3rd, 2017

    Q8. I have a doc about the routing table, it interchangeably uses the terms “prefix”, “prefix-length”, “mask” and “subnet mask” and “network”. A network mask could mean a classful mask or it could also be used to denote a subnet mask. A subnet mask can be anything between /0 and /32. A prefix could denote an entire ip address with mask or it could just be an expression for cidr notation (i.e. that which comes after the “/”). Hard to say what cisco would be expecting as an answer. I googled this question and every site that I have seen is saying that the answer is D (network mask).

  15. Anonymous
    May 8th, 2017

    recent dumps please email to {email not allowed}

  16. Me
    May 10th, 2017

    How does a router handle an incoming packet whose destination network is missing from the routing
    table?
    A. it broadcast the packet to each interface on the router
    B. it discards the packet
    C. it broadcasts the packet to each network on the router
    D. it routes the packet to the default

    dump said the answer is B. why not D? any one can answer with resource that can i check with plzzzzzzzzzzzz

  17. MUhammad Mohyuddin
    May 16th, 2017

    How does a router handle an incoming packet whose destination network is missing from the routing
    table?

    B. it discards the packet

  18. Anonymous
    May 24th, 2017

    there are only answer where to get the question

  19. Kory
    June 13th, 2017
  20. Anonymous
    June 13th, 2017

    Hello!

    In question 8

    The correct answer is B?

    There is no subnet mask in the routing table, only prefix.

    Weird…

  21. @Anon
    July 8th, 2017

    Prefix is more that CIR that is basically network mask that can be classless.

    example:
    Prefix 10.1.1.0/24 <- you got information about network and it's mask
    Network mask 255.255.255.0 or /24 <- only information about network mask

  22. Mykolizal
    July 17th, 2017

    FFS Q8 is B. Fix that SHIfT already.

  23. Mykolizal
    July 17th, 2017

    Since i have read the comments it is a freaking Cisco “show me the money” question. Could be both ….