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IP Address Questions

November 21st, 2017 Go to comments

Question 1

Explanation

IP multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to potentially thousands of corporate recipients and homes.

IP multicast delivers application source traffic to multiple receivers without burdening the source or the receivers while using a minimum of network bandwidth.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_ovr.html

Question 2

Question 3

Question 4

Explanation

In order to send traffic to multiple devices (not all) across different subnets we need to use multicast addresses, which are in the range 224.0.0.0 through 239.255.255.255 -> D is correct.

Question 5

Explanation

The RFC 1518 is Classless Interdomain Routing (CIDR), which is created to save the IPv4 addresses because we can now assign IP addresses classless. Therefore, instead of assigning the whole block of a class B or C address, now smaller blocks of a class can be assigned. For example, instead of assigning a whole block of 200.1.45.0/24, a smaller block, like 200.1.45.0/27 or 200.1.45.32/27, can be assigned.

The RFC 1918 is Address Allocation for Private Internets, which reserves IP addresses for private and internal use. These addresses can be used for networks that do not need to connect to the Internet.

Therefore the RFC 1918 is the best choice to “alleviate the depletion of IPv4 public addresses”.

Question 6

Explanation

Only three connection types are commonly known and used in Internet Protocol version four (IPv4) networks: unicast, multicast and broadcast. A fourth connection type, Anycast, was unknown until IPv6 made it a standard connection type. Anycast is not standardized in IPv4 but can be emulated. IPv4 Anycast addressing is a good solution to provide localization for services and servers in order to obtain robustness, redundancy and resiliency.

The basic idea of Anycast is very simple: multiple servers, which share the same IP address, host the same service. The routing infrastructure sends IP packets to the nearest server (according to the metric of the routing protocol used). The major benefits of employing Anycast in IPv4 are improved latency times, server load balancing, and improved security.

Reference: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.116.6367&rep=rep1&type=pdf

Question 7

Explanation

Usually using private IPv4 addresses in a organization is free so surely they are less costly than public IP addresses which you have to buy -> B is correct.

Also we can use private IPv4 addresses to devices that do not need to connect to the Internet because Internet requires public IPv4 addresses -> C is correct.

Answer D is not correct as we still need to use NAT policies to limit which private IPv4 addresses in our company can access our resources.

Question 8

Question 9

Explanation

This is a tricky question if you don’t have a close look on the network. The first octet is 191, not 192 so it belongs to class B, not class C.

Question 10

Question 11

Question 12

Explanation

The Internet authorities have reserved the multicast address range of 01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF for Ethernet and Fiber Distributed Data Interface (FDDI) media access control (MAC) addresses.

Comments (50) Comments
  1. Ppetro
    February 6th, 2017

    Q1 – correct answer are B&E

  2. 9tut
    February 7th, 2017

    @Ppetro: Thanks for your information. We have just fixed it!

  3. junan
    February 7th, 2017

    plz show the questions

  4. BigP
    March 21st, 2017

    Question 5 RFC 1918 is the correct answer. The Motivation of RFC 1918

    ” The Internet has grown beyond anyone’s expectations. Sustained exponential growth continues to introduce new challenges. One challenge is a concern within the community that globally unique address space will be exhausted.”

  5. Armo
    March 31st, 2017

    Q5 – Correct Answer is 1918 according to ICND 1 (100-105) Chapter 13: Perspectives on IPV4 Subnetting – Private IP Networks.

    I didnt find any section related to RFC 1518 neither in ICND 1 & 2

  6. Manson
    May 1st, 2017

    Q1 – correct answer are D&E

  7. Rahul
    May 4th, 2017

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  8. Anonymous
    May 17th, 2017

    Está errada a resposta da questão 5. A resposta correta é RFC 1918 (D).
    It’s wrong the answer of question 5. The right answer is RFC 1918 (D).

  9. Anonymous
    June 3rd, 2017

    1518 – CIDR (An Architecture for IP Address Allocation with CIDR) (https://tools.ietf.org/html/rfc1518)
    1918 – Address Allocation for Private Internets (https://tools.ietf.org/html/rfc1918)

  10. zebra
    June 9th, 2017

    where are the questions??

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    June 13th, 2017

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    June 14th, 2017

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  13. RM
    June 27th, 2017

    Question 5

    Which RFC was created to alleviate the depletion of IPv4 public addresses?
    A. RFC 4193
    B. RFC 1519
    C. RFC 1518
    D. RFC 1918

    Where can I find the RFC answers in the Cisco test books?
    In the Cisco exam books, the RFC 1918 is mentioned, no matter what context! RFC 1518/1519 is not mentioned in any examination manual!

    Answer RFC 1918 is correct!

  14. Crack
    July 25th, 2017

    Q5
    I would go with C
    http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=4

    “CIDR is a mechanism developed to help alleviate the problem of exhaustion of IP addresses and growth of routing tables.”

  15. Jessy
    July 28th, 2017

    RFC 1918 defines the set of PRIVATE IP networks, not PUBLIC, so answer D is incorrect.

  16. MKH_TX
    August 26th, 2017

    For Q5 I would go for RFC 1518.
    I read about the RFC 1518, its about the CIDR, VLSM which actually helps reduce the IP space in public domain.
    RFC 1918 is about Private IP address.

  17. Pablix_10
    August 27th, 2017

    I think @9TUT that Question 8 is wrong

    What are two benefits of private IPv4 addresses? (Choose two)

    A. they can be implemented without requiring admin to coordinate with IANA
    B. they are managed by IANA
    C. increase the flexibility of network design
    D. provide network isolation from the internet
    E. they are routable over internet

    9 TUT Answers: A D

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    September 6th, 2017

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    September 9th, 2017

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    November 7th, 2017

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  28. dogville
    December 17th, 2017

    Q 5: right answer C. (CIDR)
    From W. Odom Exam guide (pag. 675):
    “The IETF came up with several short-term solutions to make IPv4 addresses last longer, and
    one long-term solution: IPv6. NAT and CIDR helped extend IPv4’s life another couple of decades.”

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    December 17th, 2017

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  30. ykj
    December 18th, 2017

    How many primary IPv4 addresses can be assigned to an interface?
    A. unlimited
    B. 8
    C. 2
    D. 1

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    December 24th, 2017

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  44. cthelite
    March 29th, 2018

    Q10:
    Which 2 options are the best reasons to use an IPV4 private IP space? (Choose Two)
    A) to enable intra-enterprise communications
    B) to conserve global address space
    C) to manage routing overhead
    D) to connect applications
    E) to implement NAT

    anyone…? anyone…?
    A – could be IF implemented w/NAT, but “intra” seems to indicate PUBLIC, so seems like a “NO”
    B – ABSOLUTELY YES
    C – CIDR yes, private IPs no
    D – wha???
    E – this is certainly not a reason to USE private address space, just a necessity if you do…

    Maybe D should be “to connect enterprise applications”?
    Then I could say B and D. But as is… something ain’t right.
    Am I missing something?

  45. REDGES
    April 4th, 2018

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    July 27th, 2018

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  47. Majid
    August 28th, 2018

    I don’t see any questions in all the sections. Only the answers are visible, but no questions exist for the same.

  48. InfiniteMaster
    September 18th, 2018

    why private less cost than public ip address agik :)

  49. Mian
    September 18th, 2018

    Private address space cost nothing

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