CCNA And CCENT Practice Exam: Trunking

Here’s a CCNA 200-125 and CCENT 100-105 practice exam for you on Cisco switch trunking. Let’s get started!

Q1:  To which VLANs does a trunk port belong by default?

A.  All VLANs.

B.  All default VLANs only.

C.  None.

D.  The native VLAN only.


Q2:  What is the default native VLAN for a Cisco switching trunk?  

(Short answer, no choices.)


Q3:  What command resulted in the following output?

Cisco switch command


Q4:   Of ISL and IEEE 802.1q, which are Cisco-proprietary?

A.   Both of them.

B.   ISL only.

C.   IEEE 802.1q only.

D.  Neither of them.


Q5:   What is the default behavior of the Inter-Switch Protocol in regards to encapsulating frames before sending them across a trunk?

A.  All frames will be encapsulated.

B.  ISL doesn’t encapsulate any frames.

C.  Only frames destined for the native VLAN will be encapsulated.

D.  ISL encapsulates all frames except those tagged with the native VLAN ID.

Answers right after this very short commercial break!

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And now… the answers!

Q1.  “A”; a trunk port belongs to each and every VLAN by default.

Q2.  The default native VLAN on a Cisco switch trunk is VLAN 1.

Q3.  That is the very important output of show interface trunk, our #1 trunking verification and troubleshooting command.

Q4.  “B”.  ISL is Cisco-proprietary, IEEE 802.1q (“dot1q”) is the industry standard.  That’s a fancy way of saying “it’ll run on non-Cisco switches”.

Q5.  “A”.  One major drawback of ISL is that all frames are encapsulated before being sent across the link, which puts an extra workload on both the sending and receiving switch.

Check my CCNA practice exam page for more free tests, and thanks for dropping by!

Chris B.