Home > ICND1 – Basic Questions

ICND1 – Basic Questions

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

Question 1

Explanation

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

Explanation

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:

show_config_question_answer_2.jpg

show_ip_interface_brief.jpg

Question 3

Explanation

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

Question 4

Explanation

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

Explanation

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

Question 6

Explanation

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

Explanation

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

Question 8

Question 9

Question 10

Explanation

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 (100) Comments
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  1. Shaun L
    October 19th, 2013

    AWESOME!! How close are these to the actual exam from the 100-101 question bank? Also, are there additional questions that aren’t in here?

  2. Shaun L
    October 19th, 2013

    Just wanted to be more clear on prior question. Do I need to go over the question bank from prior exam version as well as this new exam? Also, has the labs changed at all from the prior exam version? If so, how soon will that be on here? Thanks again and great job!

  3. kamal
    October 19th, 2013

    I wonder do new exam don’t have lab sim, only question and selections of answer, so cisco have remove any sin lab?

  4. jp.ccna
    October 24th, 2013

    There are Lab Sims. If you go to examcollection.com and read the responses to the vce downloads, you will see information on the types of sims people are getting.

  5. shuiyy
    October 25th, 2013
  6. jp.ccna
    October 29th, 2013

    I tested 10-25-13. There were 3 sims. None of them required configuration. The only commands I had to run were show run and show ip ospf interface

  7. r4 logiciel
    October 31st, 2013

    Very very good prepared post. It will be supportive to anybody who makes use of it, which includes me. Maintain performing what you are undertaking a?? cana??r hold out to read far more posts.
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  8. Shaun L
    November 8th, 2013

    @9tut. How many of these questions of the 100-101 are current for exam? See throughout bank of questions, that most of these are from recent version of exam.

  9. Anonymous
    November 12th, 2013

    is this Really the questions of the exam 100-101?

  10. tom
    November 23rd, 2013

    i’ve licenses for pass4sure engines. i bought them for 126 and would sell for 50. just wanna share my cost. if anyone interested email me at zatia10@yahoo.com

  11. Stephen H
    December 10th, 2013

    I took the exam on 12-06-13 and passed with 867. The questions are nearly identical to the ones posted here. No IPv6 on the exam at all. Sims consist of only “show” commands. If you know all the questions here, you will pass.

  12. tendy
    December 20th, 2013

    i took the exam today nd iscored 986, thnx 9tut

  13. CCENT someday
    December 23rd, 2013

    Q4:

    Question 4

    Refer to the exhibit. If the hubs in the graphic were replaced by switches, what would be virtually eliminated?

    A. broadcast domains
    B. repeater domains
    C. Ethernet collisions
    D. signal amplification
    E. Ethernet broadcasts

    On another website I’ve read it was (E) Ethernet broadcasts. How can I tell the difference? Both sound good.

  14. Anadi
    January 20th, 2014

    having CCENT @ 22 Jan……Wish me luck guys hope 9tut helps….

  15. CiscoVanPrep
    January 21st, 2014

    Hey Anadi, Good Luck! nail the exam.

  16. ANDILE
    January 24th, 2014

    HEY ANADI HOW DID U GO?

  17. CCENT Someday
    January 31st, 2014

    Anyone,

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

    Thanks in Advance!

  18. Donathien Lagloire
    January 31st, 2014

    je passe l’exam le 8 fevrièr quels sont les labsim?

  19. What to Ask
    February 2nd, 2014

    Can anyone please tell me if the content on here are the latest and up to date material? having exam soon

  20. Mahbub
    February 2nd, 2014

    Is it enough to practice this webpage exam for ICND1 ? i like to take the exam next week. please give me some hints.

  21. Mahbub
    February 8th, 2014

    Thank God. I Passed today ICND1 960/100. From this section I got 2, 3, 5, 6, 7, 9

  22. xxz
    March 14th, 2014

    Dear 9tut,

    Where are the old ICND1 contents? More specifically wireless questions and their explanations..

  23. 9tut
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    @xxz: We are sorry but we have removed the old ICND1&2 content so that our readers will not be confused when learning for the new exams.

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    Has anyone had IPv6 questions on their exams????

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    August 23rd, 2014

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