Home > ICND1 – Basic Questions 2

ICND1 – Basic Questions 2

June 26th, 2017 in ICND1 100-105 Go to comments

Question 1


Only a router or a Layer 3 switch can mitigate a broadcast storm because they separate broadcast domains -> B and D are correct.

Question 2


AREA 1 has “multiple collision domains” so Network Device A must be a device operating in Layer 2 or above (a router or switch) -> A & E are correct.

AREA 2 only has “single collision domain” so Network Device B must be a device operating in Layer 1 (a hub or repeater) -> D is correct.

Question 3


The “Ctrl-Shift-6” and “x” is used to suspend the telnet session. In this case, the telnet session from Router1 to Router2 will be suspended.

If we enter the keyword “resume”, Router1 will try to resume the telnet session to Router2 (you will see the line [Resuming connection 1 to … ]) and we will get back the Router2> prompt.

Question 4


In the topology above only routers and switches are used so for each link we have one collision domains. In the picture below each pink ellipse represents for one collision domain.


Question 5


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


Question 6

Question 7


Carrier Sense Multiple Access with Collision Detection (CSMA/CD) is the LAN access method used in Ethernet. When a device wants to gain access to the network, it checks to see if the network is free. If the network is not free, the device waits a random amount of time before retrying. If the network is free and two devices access the line at exactly the same time, their signals collide. When the collision is detected, they both back off and wait a random amount of time before retrying.

CSMA/CD is used with devices operating in half-duplex mode only. CSMA/CD helps devices connecting to half-duplex switch ports operate correctly.

Question 8


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 9

Question 10

Question 11


To remember which type of cable you should use, follow these tips:

– To connect two serial interfaces of 2 routers we use serial cable
– To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable

For example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… and we use crossover cable to connect switch to switch, switch to hub, router to router, host to host… )

Notice in this question, connecting to the Frame Relay means connecting to another router. Also we must use serial cable (or Fiber Optic cable) because the distance to the Frame Relay is far so we can’t use Ethernet cables.

Rollover cable can be used to connect a computer terminal to a network router’s console port. This is often used when we turn on the router for the first time.

Question 12

Question 13

Question 14

Question 15


Both switch and router separate collision domains. In other words, each port of the switch and router creates one collision domain so we have 15 collision domains in this topology.

Comments (100) Comments
Comment pages
1 2 324
  1. Router47
    October 20th, 2013

    Thanks for the new ICND1 info.

  2. Router47
    October 20th, 2013

    Thank you for the explanation for the answer of Question # 3 about the x and “resume” commands.

    Never heard of those before.

  3. Victorino
    October 21st, 2013

    Thanks a lot for the interesting questions, and good explanation

  4. MTISolutions
    October 24th, 2013

    This is good review before studying for ICND2 200-101. Took 802-816 on the day it retired and failed-score 776. Kinda feel like I’m starting all over…again!

  5. jp.ccna
    October 24th, 2013

    The explanation for Question 1 is wrong. Layer 2 switches do not break up broadcast domains by default. They can breakup broadcast domains via VLANS, however.
    Layer 3 switches, on the other hand, do break up broadcast domains on any ports that have been defined as layer 3 ports.

  6. polkk
    October 25th, 2013
  7. 9tutq
    October 26th, 2013

    @jp.ccna: Yes, you are correct. In that question we want to mention about Layer 3 switch which functions as a router. Thanks for your detection, we updated the explanation!

  8. kammal
    October 28th, 2013

    @9tur.ccna thanks for the notes and explanstiob. please wich lab sims are included in the exam for icnd1 thanks again.

  9. sinmal
    October 30th, 2013

    Thanks for these questions they sharpen our understanding. we are able to notice our weaknesses.

  10. ronnie
    November 19th, 2013

    I love this work man! keep it up !

  11. tester
    November 21st, 2013

    its easier than the old icnd1 …i havent seen anything new

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    January 22nd, 2014

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  19. CCENT Someday
    January 31st, 2014


    I plan on taking exam next week. What other sims/labs did you get besides the OSPF 6 router?

    Thanks in Advance!

  20. Donathien Lagloire
    January 31st, 2014

    plus que quelque jour avant l’examen y’a t’il d’autre labsims?

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    February 2nd, 2014

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    February 7th, 2014

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  24. Mahbub
    February 8th, 2014

    Guys, practice only 9tut questions, you’ll pass

  25. hamis
    February 18th, 2014

    hello i want 2 know ccna when it be expired coz i want do exam zc month.thanx

  26. DJDEE
    April 17th, 2014

    does anybody know where i can register icnd 1 and 2 or ccna exam in nyc (preferably manhattan). thank you

  27. fez
    April 24th, 2014

    Passed my 100-101 exam today and question 2 and 3 was there.. all the best.

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    May 1st, 2014

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  29. Manohar Tn
    May 16th, 2014

    Got 986/1000 Marks, {5/16/2014} 50 Questions, Ospf Sim, Security simlet, and Router and switch Simlet Was also there…..All questions From 9tut. and Examcollections…..Now Heading For Icnd2 And Blogging…..

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  30. failsauce
    May 20th, 2014

    I am concerned about the answer on Q. 3 being c. When I do this in my simulation it put me in #privlaged mode. I wonder if it shouldn’t be D.

  31. ipvcloud
    May 29th, 2014

    Failsauce, it happened the same for me in question 3, but try one more time and then press enter or type resume and you will see, it works!!.

  32. Black Soul
    May 30th, 2014

    In q3,
    i have complicated for why router2> is shown
    i think it is router1#

  33. Mimmy
    June 2nd, 2014

    Q. 3 should be Router 2#. When I do this in my simulation it puts me in #privileged mode. The answer should be D

  34. ragnar
    June 16th, 2014

    The answer in Q.3 is correct. When the connection from Router 2 is suspended it is in user exec mode Router2>, so when you resume the connection you will be placed in user exec mode again. You would only be placed back in to enable mode Router2# if that was the mode you were in when suspending the session.

  35. Sandy
    June 25th, 2014

    Informative post. Thanks much!!!

  36. Ibtu
    July 2nd, 2014

    #Mimmy is correct about Q. 3
    Thanks 9tut for making exam workload simple

  37. Anonymous
    July 7th, 2014

    i plan to give ccna give please help.

  38. BrOwNiEee
    August 5th, 2014

    Just passed my exam today. All the same questions as mentioned here. I had 2 houres that’s more then enough.

    thanks 9tut

  39. Fmonz
    August 20th, 2014

    Hey guys, take a look at this.
    The answer to question 3, should not be the D?

    Trying …Open

    User Access Verification


  40. Fmonz
    August 21st, 2014

    Lo siento, olvide aclarar que CBA es el 2º router, y en CBA>yo ejecuté ctrl+shift+6 x

  41. Fmonz
    August 21st, 2014

    Sorry, I forgot to clarify that CBA is the 2nd router, and CBA> I ran ctrl + shift + 6 x.

  42. TSgt Ciz
    August 27th, 2014

    I hate Question 4. CISCO keeps acting as if 99.9% of links aren’t full duplex these days. In that network with all links being Full duplex there are ZERO collision domains as every link can TX and RX at the same time.

  43. Saudi Mizer
    September 6th, 2014

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    October 7th, 2014

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    October 28th, 2014

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  46. Legend
    October 28th, 2014
  47. Addie
    October 28th, 2014

    Q3 Resume command entered after telnet suspended

    All please pay CLOSE attention to the wording in the questions: AS explained in the answer explanation.
    Q3 clearly states:
    ” If the resume command is entered after the sequence that is shown in the exhibit, which router prompt will be displayed?”

    “if the RESUME command is entered.”

    so after CTL + shift 6 suspends telnet.
    entering the resume command will Resume Telnet so the prompt would be
    back to Router2>

    so the correct answer is C.

    Mahalo 9Tut….

  48. beatrice
    November 9th, 2014

    i don’t understand qn4. Why can’t it be 14 instead of 15?? According to what i know switches provide multiple collision domain and router provide broadcast domain! Anyone Help

  49. Yahia Tariq
    November 22nd, 2014

    Question 1 were in exam on 20/11/2014, more than 45 questions were from 9tut !

  50. Trekker14
    November 29th, 2014


    The link between routers is considered a collision domain.

  51. shadrack tanui
    December 1st, 2014

    thanks…..the questions were very resourceful.the resume command is new to me tho

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  54. Vic
    January 25th, 2015

    @beatrice. I don’t think “provide” is the best word. Switches break or separate collision domains, and so do routers. Routers break or separate broadcast domains by default. Switches don’t break broadcast domains by default. Easy way to figure it out, count the cables and that’s the total collision domains…as long as there are no hubs.

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    July 13th, 2015

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  84. Anonymous
    July 13th, 2015



  85. Anonymous
    July 15th, 2015

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    July 24th, 2015

    15 collision domain

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    December 26th, 2015

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    January 20th, 2016

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    January 24th, 2016


  97. axam
    January 29th, 2016

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  98. Davison
    February 22nd, 2016

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  99. Anonymous
    March 14th, 2016

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  100. mery
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