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ICND1 – Switch Questions

December 16th, 2016 in ICND1 100-105 Go to comments

Question 1

Explanation

Each port on a switch is a collision domain while each VLAN is a broadcast domain because broadcast is only forwarded within that VLAN so we have 48 collision domains and 4 broadcast domains on this switch (if all ports are used).

Question 2

Question 3

Explanation

When a switch receives a frame, it first checks for the destination MAC address and tries to find a matching entry in its MAC address table. If found, the switch then forwards that frame on the corresponding port associated with that MAC address. If no entry is found, the switch will flood that frame out of all (active) ports except the port that sent it.

Question 4

Question 5

Question 6

Explanation

A hub is not as “intelligent” as a switch because a hub does not try to remember anything passing to it. It just floods out all the ports (except the one that sent it) when it receives a frame.

Question 7

Explanation

When a switch receives a frame, it first checks for the destination MAC address and tries to find a matching entry in its MAC address table. If found, the switch then forwards that frame on the corresponding port associated with that MAC address. If no entry is found, the switch will flood that frame out of all active ports except the port that sent it. In this case, the destination MAC address 0000.00dd.dddd has not been in the MAC address table so the switch will flood the frame out all of its ports except fa0/0 (the port that it received the frame) -> D is correct.

Also, the switch learns that the MAC address 0000.00aa.aaaa is received on fa0/0 -> the switch adds 0000.00aa.aaaa and its corresponding port fa0/0 to the MAC address table -> A is correct.

Question 8

Explanation

The destination MAC address is ffff.ffff.ffff so this is a broadcast frame so the switch will forward the frame out all active switch ports except for port fa0/0.

Question 9

Explanation

In this case the destination MAC address has been learned so the switch just forwards the frame to the corresponding port. It also learn that the source MAC address of host A has not been existed in the MAC address table so it will add it (and port fa0/3) to its MAC address table.

Question 10

Question 11

Comments (63) Comments
  1. Raymon
    October 22nd, 2013

    answer question 11 is E

  2. Router47
    October 22nd, 2013

    Raymon, I disagree.

    B is the correct answer because the Switch already has the Destination MAC in its MAC address table.

  3. Mike
    October 23rd, 2013

    I agree the router47, the switch is already aware of the Mac Address

  4. Kam
    October 24th, 2013

    I know why Raymon said ans is E for Q11, in pass4sure it is incorrect and the answer is E there, but correct answer is B

  5. Dav
    November 6th, 2013

    Yes Kam, I agree with you,
    answer for this question in pass4sure dump from Spike is incorrect (E) although his explanation is correct when we click on “Show Answer” button.

  6. Dav
    November 7th, 2013

    In regards with Question 11, another similar question exists with same Mac address table but, frame received by Switch A has Destination Mac 00b0.d0da.895a.

    Question is :
    “SwitchA receives the frame with the addressing shown in the exhibit. According to the command output also shown in the exhibit, how will SwitchA handle this frame?”

    Answers proposed are :
    “A – It will drop the frame
    B – It will forward the frame out port Fa0/3 only
    C – It will flood the frame out all ports
    D – It will flood the frame out all ports except Fa0/3.”

    Then, D is the correct answer for this question.

  7. Marco
    December 8th, 2013

    Of course 11 is B. Why do people learn answers by heart and also always trust them? Read the material, learn the material, watch CBT Nuggets etc etc….instead of saying it’s E just because pass4sure says it is. Not trying to be rude, but for the love of God use your brain. We have too many people at work that got their exams just by learning answers, and the result is terrible, since they don’t know sh**!!! 😛

  8. Marco
    December 12th, 2013

    Of course I didn’t pass CCNA by using this site. I’m only here to troll you.

  9. 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!

  10. Alex
    February 6th, 2014

    Of course the answer for question 11 is B, because the switch know the port of destination mac address

  11. Randy
    February 9th, 2014

    Question 10, b and d is the same thing? ARP request is a broadcast to all but the source.

  12. fructal
    February 26th, 2014

    Randy, I think the point is that switches do not send ARP requests – PCs do.

  13. JamesK
    March 4th, 2014

    Question 6 answer B says the switch remembers the MAC of directly connected devices. That is not correct. It remembers the MAC of all devices that can be reached through that port. So, if there is a switch or hub connected to that port, it will remember the MACs of all devices attached to that switch or hub as well as those beyond. If this were not the case, it would not be possible to have more than one switch in a network, as the switch wouldn’t know how to reach anything beyond the next switch.

  14. Pretty smart guy
    March 5th, 2014

    Randy and fructal,

    b and d are not the same thing. Fructal kind of has it right. The pc has already performed an arp request, that’s how he knows what to put as the destination MAC address in the frame. And as he also said, switches do not perform ARP requests. They simply forward a frame out all ports except the receiving port if they do not have an entry in their MAC tables for that specific MAC address. The question asks how will the switch handle the frame, and since the switch has no entry in it’s MAC table for that destination address, it will forward that frame out of all of its active ports except for the port that it received the frame on.

  15. JoseD
    March 22nd, 2014

    B is correct

    Source MAC:
    Hello SWITCH A, I have a frame delivery for 00b0.d0da.cb56

    SWITCH A:
    Let me check my MAC Table here…
    AHA! I have a MAC entry here for 0b0.d0da.cb56 already and I will forward the frame out to port FA0/6 only.

    NOTE:No need to shout/flood/broadcast to all ports. Hey all ports!(except source port) Do you own this mac address 00b0.d0da.cb56?
    Since we have the destination mac address already on the MAC Table, answer is B

  16. shyamal
    April 11th, 2014

    I Agree with JoseD…What does switch do…It learns the mac address. If the switch has the entry in mac table..then switch will just forward it to that port, and will not flood all the port.

    Shyamal

  17. Mustafa
    April 20th, 2014

    Yes its B sure 100%, the scenario is the switch getting the frame from port 3 and forward it to port 6 its simple as that, its really disaster if pass4sure did it the wrong answer.

  18. fez
    April 24th, 2014

    Passed my 100-101 exam today and question 2,3,4,5,7,8 and 9 were there.. all the best

  19. 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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  20. KL
    May 20th, 2014

    I passed the exam last week, many question from 9tut,as from this chapter were in the exam.
    Thnx 9tut 😉

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    May 29th, 2014

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  22. CCNA/CISSP Dreams
    June 26th, 2014

    Thank you Jose D. Your example was awesome.

  23. Jo
    July 1st, 2014

    regarding question 8: Frame will be forwarded to all ports, “Because it’s a broadcast frame”.

    I didn’t even know about this thing called broadcast frame, so looked it up.
    kuddo’s to the great and complete explanations

  24. Anonymous
    July 8th, 2014

    For question #1 i think A and B are both correct cause you didn’t specify respectively or not,
    for A is 4 broadcast domains because of those 4 Vlans and 48 collision domains and B is viceversa

  25. sanjay
    August 14th, 2014

    pls tell me on exam short commands are working or not .. i mean ro#sh

  26. sanjay
    August 14th, 2014

    pls tell me on exam short commands are working or not .. i mean ro#sh run ,int fa 0/0 like that pls tell me on 18 i want to take exam …

  27. Anonymous
    September 14th, 2014

    Can anyone tell me why option “B” is not correct in question 7. Why switch will not add the destination MAC address 0000.00dd.dddd. Does it need the full path to the destination before it add the destination MAC address to the table?

  28. Anonymous
    September 15th, 2014

    It adds the source MAC, not the destination.

  29. Mioks1
    September 30th, 2014

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  30. Norna
    October 4th, 2014

    @Raymon : the Switch is not Lazy like you, why does it have to shout/flood/broadcast to all ports.
    Antention all ports!(except source port) Do you own this mac address 00b0.d0da.cb56?
    While on the look up table ther’s Destination
    And comeon on Networking u don’t memorize answers……ds site explains

  31. TOM
    October 7th, 2014

    Aren’t there any VLAN or VLAN trunking questions on the current ICND 1 exam?

  32. KIDDY Cyber
    October 9th, 2014

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  33. Jay
    October 18th, 2014

    need icnd1 dump, please help jjay_001@yahoo.com, thank you

  34. Marco
    November 11th, 2014

    Correct me if I’m wrong: it is not complete to say that “A switch tracks MAC addresses of directly-connected devices” because it also tracks MAC addresses of NIC that are attached to non directly-connected devices.

  35. Yahia Tariq
    November 22nd, 2014

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  37. Vic
    January 25th, 2015

    @Marco. I also dislike this question. Technically a Switch can have many devices directly attached and not know their mac addresses. Not until they send something that is.

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    February 11th, 2015

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    February 26th, 2015

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  40. pgcdp
    February 27th, 2015

    Questions 1, 3, 4, 5, 6, 7 and 8 were on the exam. Good luck!

  41. Ahmed
    March 28th, 2015

    q1,4, 5, 7 and 8 in icnd1 exam

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    April 9th, 2015

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  45. Anonymous
    April 15th, 2015

    hi guys just took the exam and Q2,3,4,7 and 9 were there.

  46. Future Networking Pro
    April 25th, 2015

    11 is not E or D its B. because both source and destination MAC address are in the MAC address table and so when the switch receive a frame destined for a port and address thats is already in the MAC table, the switch forwards to that address and the port only. in order for the switch to forward to all ports except the port in which the frame was received on, the frame has to be addressed to all FFFFFFFf which is for broadcast. Another instance in which a switch will forward to all port except the port in which the frame was received on, the Destination address has to be missing from the MAC table and the the switch will send it to all port. If you arrant sure about the answer, please don’t confuse others.

    Refer to the exhibit. SwitchA receives the frame with the addressing shown in the exhibit. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

    A. It will drop the frame.
    B . It will forward the frame out port Fa0/6 only.
    C. It will forward the frame out port Fa0/3 only.
    D. It will flood the frame out all ports.
    E. It will flood the frame out all ports except Fa0/3.

  47. G-10
    April 26th, 2015

    Q 1,2,4,5,6,8,10,11 is were in the exam, i take it the last friday

  48. Jigplate
    April 29th, 2015

    regarding Q7, I have an issue with the answer given. In the question, the MAC address table shows that the MAC addresses for PC B and C are already known ( ports fa0/1 and fa0/2). If a frame from PC A destined for PC D arrives at the switch, BOTH the source and destination MAC’s will be added to the table, In addition, the frame will be forwarded out of all ports except the one it came in on ( fa0/1, 0/2 and 0/3). It seems this question really has 3 correct answers. Any comments?

  49. Tom Engelke
    April 29th, 2015

    Switches only remember source mac addresses when frames arrive. This is because it is 100% certain which port has that device is connected to. The switch does not record the destination mac address because it cannot be 100% certain which port the device is connected to. Therefore the switch will foward the frame to all other ports except the port tge frame arrived on. Reason for this is if the destination device is on the same port on the switch then the switch does not need to foward the frame. Once the destination device responds to the frame the switch will record the mac address on the port the reply was received on. Once again because tge switch is 100% certain the port the device is connected to. I guess you could say that devices on a network needs to be certain of where devices are located otgerwise a broadcast is used to locate them. Review, switches only used source mac address when recording where devices are connected.

  50. Jigplate
    May 1st, 2015

    Tom,
    Both in Packet tracer, and on live equipment, the MAC address table starts out empty. If one host pings another, Both the source and the destination MAC address of the 2 hosts will then populate the table. As to Q7 then, A and B are both technically correct.

  51. jimi
    May 10th, 2015

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  52. anasty
    May 30th, 2015

    Thanks

  53. Hemal
    June 21st, 2015

    Hi JigPlate

    Regarding Q7 :- B is not correct answer .

    Switch will only add mac address of PC D in MAC Table when PC D responds to broadcast frame .

    Check ICND1 book . Page 192 figure 6.6 for explanation. Hope it helps

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    November 8th, 2015

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  60. Asmara
    November 29th, 2016

    as long as we are aware of the source and destination MAC address, no need for the switch to flood frames to the rest of active ports but Fa0/6

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