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Basic Questions 2

November 30th, 2017 Go to comments

Question 1


MDI stands for “Medium Dependent Interface”. MDI is a type of Ethernet port found on network devices. When connecting two devices with MDI ports (two hosts, for example) an Ethernet crossover cable is required. The crossover cable switches the send and receive ports on the two connectors, allowing data to flow correctly between two MDI ports.

Question 2


Physical addresses or MAC addresses are used to identify devices at layer 2 -> A is correct.

MAC addresses are only used to communicate on the same network. To communicate on different network we have to use Layer 3 addresses (IP addresses) -> B is not correct; E is correct.

Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address -> C is not correct.

On Ethernet, each frame has the same priority to transmit by default -> D is not correct.

All devices need a physical address to identify itself. If not, they can not communicate -> F is not correct.

Question 3

Question 4


Only router can break up broadcast domains but in this exhibit no router is used so there is only 1 broadcast domain.

For your information, there are 7 collision domains in this exhibit (6 collision domains between hubs & switches + 1 collision between the two switches).

Question 5


Use an Ethernet straight-through cable to connect an medium dependent interface (MDI) to an MDI-X port. Use a cross-over cable to connect an MDI to an MDI port, or an MDI-X to an MDI-X port.

Reference: https://www.cisco.com/c/en/us/td/docs/security/asa/hw/maintenance/5505guide/ASA5505HIG/pinouts.html

Note: MDI/MDIX is a type of Ethernet port connection using twisted pair cabling.

Question 6


Verify that the TFTP or RCP server has IP connectivity to the router. If you cannot successfully ping between the TFTP or RCP server and the router, do one of the following:
– Configure a default gateway on the router.
– Make sure that the server and the router each have an IP address in the same network or subnet.

Reference: https://www.cisco.com/c/en/us/td/docs/routers/access/1900/software/configuration/guide/Software_Configuration/upgrade.html

The first option implies the router can be in a different subnet from the TFTP server -> D is not correct.

TFTP has no encryption process so answer B is correct.

Question 7


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.

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”

Question 8

Question 9


Single-mode fiber allows only one mode of light to propagate. Because of this, the number of light reflections created as the light passes through the core decreases, lowering attenuation and creating the ability for the signal to travel further. This application is typically used in long distance, higher bandwidth.

Because of the high dispersion and attenuation rate with multimode fiber cable, the quality of the signal is reduced over long distances.

Reference: https://www.multicominc.com/training/technical-resources/single-mode-vs-multi-mode-fiber-optic-cable/

In fact it is difficult to say what the maximum distance of single-mode or multimode fiber but according to this link (table 1):


Single-mode cable is good for installations longer than 10km.

At present, there are four kinds of multi-mode fibers: OM1, OM2, OM3 and OM4. The letters “OM” stand for optical multi-mode. OM3 and OM4 fibers will support upcoming 40 and 100 Gb/s speeds.

Comments (50) Comments
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    December 6th, 2017

    Could i have a dumps for newest question in this site please, because the file in september dont content these newest question (for exemple drag and drop 2 and 3 and others topics)?

  2. Stark
    December 7th, 2017

    kindly provide link related to questions for these answers

  3. mark
    December 11th, 2017

    @9tut please provide questions for these new answers-Basic question 2,stp questions 3 and others.IT is not the same as in your FAQ.

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    December 17th, 2017

    what does “9tut” stand for?

  5. Fatma
    December 30th, 2017

    Where is Question 3 Explanation ???

  6. Fatma
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    Where is Question 8 Explanation ???

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    How can I see the full Q & A in this website?

  10. Roman
    January 12th, 2018

    Q8: “It can transmit data at a rate higher than the path capacity”.
    Isn’t an absurd?

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  24. Tony
    March 17th, 2018

    Question 6 – Answer D may not be correct. The full explanation from the Cisco link:
    Verify that the TFTP or RCP server has IP connectivity to the router. If you cannot successfully ping between the TFTP or RCP server and the router, do one of the following:
    – Configure a default gateway on the router.
    – Make sure that the server and the router each have an IP address in the same network or subnet

    The 1st choice to configure default gateway is to communicate beyond the LAN. In fact, you always can tftp to other networks as long as the valid routing existed. The tftp not supporting encrypted format is true, at least when tftp originally developed.

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  33. Sinix
    April 24th, 2018

    Q.6 Which statement about upgrading a Cisco IOS device with TFTP server?
    A. the operation is performed in active mode
    B. the operation is performed in unencrypted format – Correct, TFTP uses no security or encryption.
    C. the operation is performed in passive mode
    D. the Cisco IOS device must be on the same LAN as the TFTP server – Incorrect, they do not have to be in the same LAN. It can use the default gateway to get there.

    This makes more sense. Am I wrong? what do you guys think?

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  37. Hisuka
    May 5th, 2018

    In question 6… choices A to C are invalid answers while choice D is the only sensible choice. In the real world, the tftp server can be on a different subnet as long as its pingable, and no firewall os blocking it.

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  44. Dany1
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    Question 6 correct answer is B, that means unencrypted. TFTP is the “Trivial File Transfer Protocol”. SO, no encryption. Only rule regarding transfering files to/from TFTP is to be reacheable. TFTP need gateway, in case is in different LAN.
    Tony find first the correct answer.
    Q8: “It can transmit data at a rate higher than the path capacity”. Roman is not absurd for UDP. UDP protocol has no verification or handshake-mechanism. You CAN transmit, but at the receiver you will not see all the packets. For TCP is impossible to do that, because are some TCP congestion-avoidance algorithm (slow-start and congestion-window).
    For example, Slow-start is used in conjunction with other algorithms to avoid sending more data than the network is capable of transmitting, that is, to avoid causing network congestion. The algorithm is specified by RFC 5681

  45. 9tut
    June 11th, 2018

    @Tony, @Dany1: Yes, thanks for your detection, we have just updated Q.6.

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