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Basic Questions

November 30th, 2017 Go to comments

Question 1

Explanation

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

star_topology.jpg

Question 2

Explanation

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

Explanation

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

Question 4

Question 5

Explanation

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

Explanation

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

Explanation

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

Explanation

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

Explanation

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

Explanation

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.

Ethernet802.3_Frame_Format.jpg

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”

 

Comments (13) Comments
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  1. w a l e e d
    February 12th, 2018

    hey any one have the latest dump update

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  2. kfa
    February 12th, 2018

    Hi to all. Need also the newes Dumps for 200-125.

    k.f.akilli (at) google mail dot com.

    Is the Exam heavy?

  3. Camilo
    February 12th, 2018

    Uri, i Download your version of ccna 200-125 from google drive. Did you just study from there? regards.-

  4. Anonymous
    February 13th, 2018

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  5. Anonymous
    February 13th, 2018

    I currently have a CCNA R&S but I am trying to obtain the CCNP R&S. Is there a website like this one that has questions or dumps available? If so, could you please email it to me? {email not allowed}

  6. Anonymous
    February 13th, 2018

    I currently have a CCNA R&S but I am trying to obtain the CCNP R&S. Is there a website like this one that has questions or dumps available? If so, could you please email it to me? amber.murry at yahoo

  7. Anonymous
    February 17th, 2018

    why are the questions not visible?

  8. THEOPHILE
    February 19th, 2018

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  9. THEOPHILE
    February 19th, 2018

    Hi great guys, i am preparing for ccna exam pls if you can send me dumps on {email not allowed}. also i will appreciate any added advice on study pattern. thanks

  10. Anonymous
    February 21st, 2018

    Hi there, does someone have the lastest dump for 200-125 R&S, please mail to me alice dot winille at gmail dot com

  11. Anonymous
    February 24th, 2018

    Hi can I please get a copy of the latest CCNA dump. My test is next week. Thank you much

    Email: {email not allowed}

  12. Anonymous
    February 24th, 2018

    Hi can I please get a copy of the latest CCNA dump. My test is next week. Thank you much

    Email: ccnastudy2018 at g mail dot com

  13. Nirav
    February 24th, 2018

    Hi all, I have exam on 28/2, if anyone had exam this year, can you please let me know how many questions came from 9tut?

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