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Basic Questions

February 6th, 2017 Go to comments

Question 1


Star topology is the most popular topology for the network which allows all traffic to flow through a central device.


Question 2


Carrier sense multiple access with collision detection (CSMA/CD) is a media access control method used most notably in early Ethernet (IEEE 802.3) technology for local area networking. When collision detection (CD) observes a collision (excess current above what it is generating, i.e. > 24 mA for coaxial Ethernet), it stops transmission immediately and instead transmits a 32-bit jam sequence.

Note: CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission used in wireless networks. Unlike CSMA/CD (Carrier Sense Multiple Access/Collision Detect) which deals with transmissions after a collision has occurred, CSMA/CA acts to prevent collisions before they happen.

Question 3


Each port of a router is a broadcast domain. This router has 2 ports so it has 2 broadcast domains.

Question 4

Question 5


Ethernet frame size refers to the whole Ethernet frame, including the header and the trailer while MTU size refers only to Ethernet payload. Baby giant frames refer to Ethernet frame size up to 1600 bytes, and jumbo frame refers to Ethernet frame size up to 9216 bytes (according to this link: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html)

For example, standard Ethernet frame MTU is 1500 bytes. This does not include the Ethernet header and Cyclic Redundancy Check (CRC) trailer, which is 18 bytes in length, to make the total Ethernet frame size of 1518.

So according to strict definition, MTU size of 1600 cannot be classified as baby giant frames as the whole Ethernet frames will surely larger than 1600 -> Answer C is not correct.

Answer D is a better choice as the MTU is 1518, so the whole Ethernet frame would be 1536 (1518 + 18 Ethernet header and CRC trailer). This satisfies the requirement of baby giant frames “Baby giant frames refer to Ethernet frame size up to 1600 bytes”.

Question 6


To understand more about TCP please read our TCP and UDP tutorial.

Note: Answer F is not correct because TCP does not require applications to determine the retranmission. TCP itself will determine if the data packets should be retransmitted or not.

Question 7


Only router can break up broadcast domains so in the exhibit there are 2 broadcast domains: from e0 interface to the left is a broadcast domain and from e1 interface to the right is another broadcast domain -> A is correct.

Both router and switch can break up collision domains so there is only 1 collision domain on the left of the router (because hub doesn’t break up collision domain) and there are 6 collision domains on the right of the router (1 collision domain from e1 interface to the switch + 5 collision domains for 5 PCs in Production) -> F is correct.

Question 8


Modern Ethernet networks built with switches and full-duplex connections no longer utilize CSMA/CD. CSMA/CD is only used in obsolete shared media Ethernet (which uses repeater or hub).

Question 9


Each port of a switch is a separate collision domain. This switch uses two ports (for 5 hosts) so there are two collision domains in total.

Question 10


At the end of each frame there is a Frame Check Sequence (FCS) field. FCS can be analyzed to determine if errors have occurred. FCS uses cyclic redundancy check (CRC) algorithm to detect errors in the transmitted frames. Before sending data, the sending host generates a CRC based on the header and data of that frame. When this frame arrives, the receiving host uses the same algorithm to generate its own CRC and compare them. If they do not match then a CRC error will occur.


Preamble is used to indicate the start of the frame by arranging the first 62 bits as alternating “1/0s” and the last two bits as “1”s. Like so, 010101010101010………………………10101011. Therefore when the receiving end sees the “11” it knows where the actual Ethernet header starts. The alternating 1s and 0s will also allow the two endpoints to sync their internal clocks. In summary, preamble is used for synchronization.

The “Type/Length” field is used to indicate the “Type”of the payload (Layer 3 protocol) which is indicated as a Hexadecimal value.

Note: Ethernet II uses “Type” while the old Ethernet version use “Length”

Question 11


MDI stands for “Medium Dependent Interface”. MDI is a type of Ethernet port found on network devices. When connecting two devices with MDI ports (two hosts, for example) an Ethernet crossover cable is required. The crossover cable switches the send and receive ports on the two connectors, allowing data to flow correctly between two MDI ports.

Comments (40) Comments
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  1. Ghouri
    April 10th, 2017

    I have gone through with both 191q and 223q. following questions are same in both but with different answers. Will somebody help.
    Q58 of 223 and q161 of 191.
    q150 of 223 and 154 of 191
    q159 of 223 and q163 of 191
    q163 of 223 and q167 of 191
    q172 of 223 and q177 of 191
    q173 of 223 and q178 of 191

  2. shenitly_bee@hotmail.com
    April 11th, 2017

    can someone send me the latest dump and question please

  3. Alexius
    April 12th, 2017

    Hi @Ghouri,can you share the latest dump and question 191q and 223q please?

  4. Anonymous
    April 12th, 2017


    remove the (dot) with (.) and (_) with (/)
    i studied this. it contains
    best of luck guys

  5. sam
    April 13th, 2017

    O que garante que estas questões irão cair na prova?

  6. fed
    April 13th, 2017

    Can someone please share the 571q, 545q or at least tell me where to get it? thanks heaps in advance.

  7. Musa
    April 14th, 2017

    Here is the New 266 Q&As

    DOWNLOAD Files at below link url

  8. s.m
    April 15th, 2017


  9. Alex
    April 15th, 2017

    I’ve exam in may, i m studying question 545q,171q,191q.
    Are these dumps valid? thanks

  10. Anonymous
    April 17th, 2017

    Download all dumps………….. only we have correct dumps

  11. smap
    April 18th, 2017

    @Anonymous I cannot see dumps

  12. RHD
    April 21st, 2017

    You can see all document and dumps what i use to pass . good luck

  13. Vicky
    April 22nd, 2017

    From where i can download the questions?

  14. alpesh
    April 22nd, 2017

    where are the questions?

  15. Cosmo
    April 23rd, 2017

    Hello everybody,
    If you’re interested in more CCNA Q&A dumps this website http://www.exam-labs.com/info/200-125 have them as well

  16. which answer is correct?
    April 24th, 2017

    191 is the sequel of 171 so choose 191 from both to prepare for the exam.

  17. lisa.sweeheat.ccna@gmail.com
    April 24th, 2017

    Hi guys pls send the updated questions 266q pretty plz…
    To lisa.sweeheart.ccna (at) gmail.com

  18. carlosm1795
    April 26th, 2017

    Hello is there any difference between 9tut.net and 9tut.com?

  19. Micky mouse
    April 28th, 2017


  20. katty p
    April 28th, 2017

    good day
    can someone send me updated questions plz

  21. soni
    May 3rd, 2017

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    May 3rd, 2017

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  23. CCNA exam dump
    May 6th, 2017

    Check the Q&A from the CCNA exam here http://www.exam-labs.com/info/200-125

  24. ray
    May 10th, 2017

    could anyone provide the latest dump for CCNA 200-125?

  25. sida
    May 10th, 2017

    please advice, is this DUMP still valid !!
    266Q CCNA_200_125 4_4_2017 v1


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    May 11th, 2017

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  27. NAIF
    May 13th, 2017

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    May 13th, 2017

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  29. Anonymous
    May 16th, 2017

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    May 16th, 2017

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    May 18th, 2017

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    May 22nd, 2017


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  33. WZM
    May 22nd, 2017

    Please anyone explain this. God bless you. Thanks in advance.

    Which condition does the err-disabled status indicate on an Ethernet interface?
    A. There is a duplex mismatch.
    B. The device at the other end of the connection is powered off.
    C. The serial interface is disabled.
    D. The interface is configured with the shutdown command.
    E. Port security has disabled the interface. (Security violation)
    F. The interface is fully functioning.

    I think A and D are Correct. But 9tut PDF says its E.

  34. Anonymous
    May 25th, 2017


  35. Anonymous
    May 27th, 2017

    When a router is unable to find a known route in the routing table, how does it handle the packet?

    A. It discards the packet
    B. It sends the packet over the route with the best metric
    C. It sends the packet to the next hop address
    D. It sends the packet to the gateway of last resort

    which one is correct option,please about this

  36. PP
    May 27th, 2017

    When a router is unable to find a known route in the routing table, how does it handle the packet?
    A. It discards the packet
    B. It sends the packet over the route with the best metric
    C. It sends the packet to the next hop address
    D. It sends the packet to the gateway of last resort
    which one is correct option,please about this
    Answer – A

  37. Shantanu
    May 28th, 2017

    Guys can you please share latest CCNA dumps.
    {email not allowed}

  38. Shantanu
    May 28th, 2017

    Guys can you please share latest CCNA dumps.

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