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CCNA – Trunking Questions

May 12th, 2015 Go to comments

Question 1

Explanation

The show vlan command only displays access ports, the trunk ports are not shown in this command (we can use the “show interface trunk” command to see trunked ports). In the output we can see the ports Fa0/1 connecting between two switches in VLAN 20 -> they are access ports and only VLAN 20 can communicate. To make all VLANs can communicate (with the same VLAN at the other switch), the link between two switches must be set as trunk -> B is correct.

Question 2

Question 3

Question 4

Question 5

Explanation

Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation (802.1Q) to be used.

Question 6

Question 7

Question 8

Question 9

Explanation

IEEE 802.1Q is the networking standard that supports Virtual LANs (VLANs) on an Ethernet network. It is a protocol that allows VLANs to communicate with one another using a router. 802.1Q trunks support tagged and untagged frames.

If a switch receives untagged frames on a trunk port, it believes that frame is a part of the native VLAN. Also, frames from a native VLAN are not tagged when exiting the switch via a trunk port.

The 802.1q frame format is same as 802.3. The only change is the addition of 4 bytes fields. That additional header includes a field with which to identify the VLAN number. Because inserting this header changes the frame, 802.1Q encapsulation forces a recalculation of the original FCS field in the Ethernet trailer.

Note: Frame Check Sequence (FCS) is a four-octet field used to verify that the frame was received without loss or error. FCS is based on the contents of the entire frame.

Question 10

Comments (18) Comments
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  1. Anonymous
    March 15th, 2016

    are these still valid ?

  2. nick
    March 30th, 2016

    These questions are still valid. Used the VCE file with Vce Trainer!

  3. Mohd Taleb
    May 2nd, 2016

    Question 6:
    C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces.
    D. 802.1Q trunks require full-duplex, point-to-point connectivity.
    according to ccna 3 exploration: trunk is only used on Fast Ethernet and Giga Ethernet. in addition it requires full-duplex, point-to-point connectivity.
    is it Right?

  4. Anonymous
    May 16th, 2016

    where are the questions?

  5. Anonymous
    May 18th, 2016

    How come I cannot see the questions? Do I need to be a member first?

  6. Anonymous
    May 25th, 2016

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  7. Whorf
    July 5th, 2016

    There’s a typo in Q9:
    Answer E should read “capable of CARRYING untagged frames”

    It was driving me mad try to find out what it meant to ‘ear’ a frame!

  8. Anonymous
    July 12th, 2016

    Question 9:

    @Anonymous and Whorf: Thank you for the clarification about the word “earring” actually being “carrying” in answer E. That was frying my brain for a minute there.

    @Chilean33: Thank you for the clarification about Answer C. I was confused as to why that was incorrect at first, since I knew that other protocols (VTP, DTP, STP, etc) deal with vlan administration, negotiation, and re-convergence issues, but now thinking back to the word “exclusively”, I guess that doesn’t really work, since 802.1Q accepts untagged frames and that could be considered another defining characteristic it has – when compared to ISL of course, which does not do that.

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    August 16th, 2016

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