Home > CCNAv3 – New Questions Part 2

CCNAv3 – New Questions Part 2

June 9th, 2018 Go to comments
Note: These new questions have not been classified into specific topics so please practice them separately

Question 1

Drag and drop the CSMA components from the left onto the correct descriptions on the right

CSMA_Components.jpg

 

Answer:

+ 1-persistent: Access mode used for Ethernet network
+ CSMA/CA: Rules that define the system response when a collision occurs on a Wi-fi network
+ CSMA/CD: Rules that define the system response when a collision occurs on an Ethernet network
+ O-peristent: Access mode used in the controlled area network
+ P-persistent: Access mode used for Wi-fi networks

Explanation

1-persistent CSMA is an aggressive transmission algorithm. When the transmitting node is ready to transmit, it senses the transmission medium for idle or busy. If idle, then it transmits immediately. If busy, then it senses the transmission medium continuously until it becomes idle, then transmits the message (a frame) unconditionally (i.e. with probability=1). In case of a collision, the sender waits for a random period of time and attempts the same procedure again. 1-persistent CSMA is used in CSMA/CD systems including Ethernet.

Non persistent CSMA is a non aggressive transmission algorithm. When the transmitting node is ready to transmit data, it senses the transmission medium for idle or busy. If idle, then it transmits immediately. If busy, then it waits for a random period of time (during which it does not sense the transmission medium) before repeating the whole logic cycle (which started with sensing the transmission medium for idle or busy) again. This approach reduces collision, results in overall higher medium throughput but with a penalty of longer initial delay compared to 1–persistent.

P-persistent is an approach between 1-persistent and non-persistent CSMA access modes. [1]When the transmitting node is ready to transmit data, it senses the transmission medium for idle or busy. If idle, then it transmits immediately. If busy, then it senses the transmission medium continuously until it becomes idle, then transmits with probability p. If the node does not transmit (the probability of this event is 1-p), it waits until the next available time slot. If the transmission medium is not busy, it transmits again with the same probability p. This probabilistic hold-off repeats until the frame is finally transmitted or when the medium is found to become busy again (i.e. some other node has already started transmitting). In the latter case the node repeats the whole logic cycle (which started with sensing the transmission medium for idle or busy) again. p-persistent CSMA is used in CSMA/CA systems including Wi-Fi and other packet radio systems.

O-persistent
Each node is assigned a transmission order by a supervisory node. When the transmission medium goes idle, nodes wait for their time slot in accordance with their assigned transmission order. The node assigned to transmit first transmits immediately. The node assigned to transmit second waits one time slot (but by that time the first node has already started transmitting). Nodes monitor the medium for transmissions from other nodes and update their assigned order with each detected transmission (i.e. they move one position closer to the front of the queue).[2] O-persistent CSMA is used by CobraNet, LonWorks and the controller area network.

Reference: https://en.wikipedia.org/wiki/Carrier-sense_multiple_access

Question 2

Drag and drop the IPv6 addresses from the left onto the correct types on the right

IPv6_addresses.jpg

 

Answer:

+ Modified EUI-64: DB:FC:93:FF:FE:D8:05:0A
+ multicast: FF01::1
+ unicast: 2020:10D8:0:0:85:800:52:7348
+ unspecified: ::

Question 3

Drag and drop the BGP components from the left onto the correct descriptions on the right.

BGP_components.jpg

 

Answer:

+ Device that running BGP: BGP speakers
+ Neighbor that share the same AS number as a local device: iBGP peer
+ Neighbor that located outside of AD domain of the local device: eBGP peer
+ Value that identify an AD: Autonomous system number
+ Value that is advertise with network keyword: Prefix

Comments (10) Comments
  1. lorenzomot
    June 9th, 2018

    Hello 9tut, only three questions new? Are new others coming in this section? Thank you!

  2. Anonymous
    June 9th, 2018

    Only these three new questions?

  3. Anonymous
    June 10th, 2018

    Thanks 9Tut,

    I’ll be taking my exam in 3 days love the good work keep it up! Please keep us informed of anything new coming up

  4. Student
    June 10th, 2018

    I found these questions in my exam on 30 May, but I failed. Going to attend on 25 June again.

  5. Anonymous
    June 10th, 2018

    @student
    were most of the older questions on your exam?

  6. Criki
    June 12th, 2018

    Hi Everyone, today i take my exam and passed with 936/1000, the 75% in this page is very usesful, among the practice labs of the exam I made one that is not in this site, but i found on google. https://www.exam-labs.com/question/776.

    Regards from Argentina.

  7. Anonymous
    June 13th, 2018

    I sat the test today and had 2 of the 3 questions listed here.

  8. nnmm
    June 13th, 2018

    @student
    did you see most or all of the questions in the other 9tut sections?

  9. lorenzomot
    June 14th, 2018

    Can someone confirm that pactically all the tests on 9tut are in the current exam? Thank you!

  10. deep inder
    June 16th, 2018

    passed today thanks a ton to 9 tut
    eigrp
    ospf
    vlan trouble

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