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QUESTION 82
In the Certkiller switched LAN, what trunguide protocol uses an internal tagging
mechanism that inserts a 4 byte tag field in the original Ethernet frame?
A. ISL
B. 802.1P
C. DTP
D. 802.1Q
E. DVP
F. None of the above
Answer: D
Explanation:
802.1Q is the IEEE standard for tagging frames on a trunk and supports up to 4096
VLANs. IEEE 802.1q uses an internal tagging mechanism which inserts a 4 byte tag field
in the original Ethernet frame itself between the Source Address and Type/Length fields.
Since the frame is altered, the trunguide device re-computes the frame check sequence
(FCS) on the modified frame.
Incorrect Answers:
A. In ISL, a 26-byte header that contains a 10-bit VLAN ID is inserted at the beginning
of the Ethernet frame.
B, C, E. These are not trunk encapsulation options
QUESTION 83
When considering the use of DTP in the Certkiller LAN, what is true regarding it?
A. DTP is not supported on private VLAN ports or tunnel ports
B. It is a point-to-multipoint
C. You always want to disable DTP
D. It supports auto negotiation in both ISL/802.1Q
E. It is a point-to-point protocol
F. None of the above
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