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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


In the “Access Routers Software Upgrade Procedures” (https://www.cisco.com/c/en/us/support/docs/routers/3800-series-integrated-services-routers/49044-sw-upgrade-proc-ram.html) at step 5:

Step 5: Verify that the TFTP Server has IP Connectivity to the Router

The TFTP server must have a network connection to the router and must be able to ping the IP address of the router targeted for a TFTP software upgrade. In order to achieve this connection, the router interface and the TFTP server must have an IP address in the same range or a default gateway configured -> The TFTP server does not need to be on the same LAN with the Cisco device.

Answer B is a reasonable choice although the word “unencrypted format” is unclear. Maybe this answer means “the operation is performed over an unencrypted protocol”.

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

Comments (18) Comments
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    December 6th, 2017

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  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

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  5. Fatma
    December 30th, 2017

    Where is Question 3 Explanation ???

  6. Fatma
    December 30th, 2017

    Where is Question 8 Explanation ???

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