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ICND1 – Basic Questions

December 26th, 2016 in ICND1 100-105 Go to comments

Question 1


CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection. In an Ethernet LAN, before transmitting, a computer first listens to the network media. If the media is idle, the computer sends its data. If the media is not idle (another station is talking), the computer must wait for some time.

When a station transmits, the signal is referred to as a carrier. Carrier Sense means that before a station can send data onto an Ethernet wire, it have to listen to see if another “carrier” (of another station) is present. If another station is talking, this station will wait until there is no carrier present.

Multiple Access means that stations can access the network at any time. It is opposed to Token-Ring network where a station must have the “token” so that it can send data.

Although Carrier Sense help two stations not send data at the same time but sometimes two stations still send data at the same time! This is because two stations listen for network traffic, hear none, and transmit simultaneously -> a collision occurs and both stations must retransmit at some later time. Collision Detection is the ability of the media to detect collisions to know that they must retransmit.

Basically, the CSMA/CD algorithm can be summarized as follows:

+ A device that wants to send a frame must wait until the LAN is silent (no one is “talking”)
+ If a collision still occurs, the devices that caused the collision wait a random amount of time and then try to send data again.

Note: A switch separates each station into its own collision domain. It means that station can send data without worrying its data is collided with the data of other stations. It is as opposed to a hub which can cause collision between stations connected to it.

Question 2


Only two commands “show interfaces” and “show ip interface brief” reveal the status of router interfaces (up/up, for example).

The outputs of two commands are shown below:



Question 3


HTTP is based on TCP connection so a TCP connection must be established first between the workstation and the web server.

Question 4


Hubs do not separate collision domains so if hub is used in the topology above, we will have only 1 collision domain. Switches do separate collision domains so if hubs are replaced by switches, we would have 22 collision domains (19 collision domains for hosts and 3 collision domains among three switches. Please notice that the WAN (serial) connection is not counted as a collision (or broadcast) domain.

Question 5


A broadcast storm can cause congestion within a network. For more information about broadcast storm please read my STP tutorial.

Question 6


Before a host can send ICMP (ping) packets to another device, it needs to learn the MAC address of the destination device so it first sends out an ARP Request. In fact, the first ping packet is dropped because the router cannot create a complete packet without learning the destination MAC address.

Question 7


The “show running-config” command displays active configuration in memory.

Question 8

Question 9

Question 10


Full-duplex communication allows both sending and receiving of data simultaneously. Switches provide full-duplex communication capability. Half-duplex communication only allows data transmission in only one direction at a time (either sending or receiving).

Comments (26) Comments
Comment pages
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  1. Jerry
    March 9th, 2017

    Passed today, a few new questions.
    Used the 285 dump, 45/50 were cover in the dump.

    Good Luck all !

  2. Hey Jerry
    March 9th, 2017

    What is the 285 dump and where did you get it?

  3. Rob
    March 10th, 2017

    Everyone, please read this.

    I’m really sick of these test dump sites that charges you $50 for wrong answers! They all say “Pass or money back” but if you read the fine print, that will never happen.

    So, I have compiled my test dump with the user ANSWERS to make 1 big document. You will see a lot of repetitive questions and some that have different answers.. that’s because I couldnt find the definitive answer. All I can tell you is that I pass with a 900/1000 just by studying this file. This mean that I DO have some wrong answers.

    Here is the link to your free test dump!


  4. Ch
    March 11th, 2017

    Thanks Rob for the link. Are you sure that these are valid dumps? I am appearing for exam next week

  5. Rob
    March 13th, 2017

    @Ch ..its the best I could do.. I tried to correct all the wrong answers from DUMPS4DOWNLOAD.. I got 900 by using this which means there are some wrong answers

  6. karim
    March 14th, 2017

    Hi Guys can you please send me ICND1 dump {email not allowed}

  7. karim
    March 14th, 2017

    {email not allowed}

  8. Anonymous
    March 14th, 2017

    Rob, you are a legend.

  9. nobs
    March 16th, 2017

    Hey Jerry, how many simulations were in icnd1. Congratulations on your achievements.

  10. Fakefake
    March 16th, 2017

    Hey @Rob thanks very much for the dump, Did you take the exam recently? and did this dump reflect the questions that were on there.

  11. Anonnymous
    March 20th, 2017

    Por favor compartir examen my email: {email not allowed}

  12. Anonymous
    March 20th, 2017

    thanks Rob! you r rock

  13. Nickname
    March 20th, 2017

    Guys; please send here the link with 284 dumps or any dump with more than 221 questions. this is the only one i find on other free sites

  14. Fling
    March 21st, 2017

    Hi Rob, I am going to be sitting for the exam soon but wanted to know how to get the dump.

  15. Fling
    March 21st, 2017

    Rob, disregard my question. I found it. Thanks for your help.

  16. Tazz
    March 27th, 2017

    Hi guys i am writting icdn1 sometime this week please help with dump link

  17. Tokkie
    April 5th, 2017

    I see expanations but no questions. Where can I found the content of the questions ? Sorry but newbie here.

  18. Fazz
    April 16th, 2017

    Am gonna write ICND1 on 18th of this April . Any suggestions ? Any of u wrote the exam in this month ?

  19. Anonymous
    April 19th, 2017

    ospf is not part of icnd1 100-105 as per cisco website…why we have so many questions on ospf in dumps.Are these dumps real?

  20. Anonymous
    April 19th, 2017

    ^Was thinking the same dam thing. Wth is up with all the OSPF?!?!

  21. Anonymous
    April 22nd, 2017

    If any of you guys had the lastest dumps or anything please could you share , I’ve come short twice with this exam (788,813) I really want to just pass 🙁

  22. Easy
    April 24th, 2017

    Just failed the exam today..had 801

  23. Anonymous
    April 25th, 2017

    Any recent dumps?

  24. Anonymous
    April 25th, 2017

    taking the exam in May is there a more recent dump?

  25. Anonymous
    April 26th, 2017

    Hey I will take a test next week. But I need to learn that how to find dumps form link below;

    I haven’t seen this.Do I need to sign in?

  26. Cat
    April 29th, 2017

    I have taken the exam twice and I am falling short 790/810. Where can I find the dump questions?

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