Cisco ActualTests 642-812 v2008-03-14 by Mareko.vce

QUESTION 32:
Two Certkiller switches are connected together as shown below:
Certkiller 1 configuration exhibit:
Certkiller 2 configuration exhibit:
Based on the information shown above, which three statements are true? (Select
three)
A. DTP packets are sent from Switch Certkiller 2.
B. DTP is not running on Switch Certkiller 1.
C. Only VLANs 1-1001 will travel across the trunk link.
D. A trunk link will be formed.
E. The native VLAN for Switch Certkiller 2 is vlan 1.
Answer: A, D, E
Explanation:
You can manually configure trunk links on Catalyst switches for either ISL or 802.1Q
mode. In addition, Cisco has implemented a proprietary, point-to-point protocol called
Dynamic Trunguide Protocol (DTP) that negotiates a common trunguide mode between
two switches. The negotiation covers the encapsulation (ISL or 802.1Q) as well as
whether the link becomes a trunk at all.
You can configure the trunk encapsulation with the switchport trunk encapsulation
command, as one of the following:
1. isl-VLANs are tagged by encapsulating each frame using the Cisco ISL protocol.
2. dot1q-VLANs are tagged in each frame using the IEEE 802.1Q standard protocol. The
only exception is the native VLAN, which is sent normally and not tagged at all.

1. negotiate (the default)-The encapsulation is negotiated to select either ISL or IEEE
802.1Q, whichever is supported by both ends of the trunk. If both ends support both
types, ISL is favored. (The Catalyst 2950 switch does not support ISL encapsulation.)
In the switchport mode command, you can set the trunguide mode to any of the following:
1. trunk-This setting places the port in permanent trunguide mode. The corresponding
switch port at the other end of the trunk should be similarly configured because
negotiation is not allowed. You should also manually configure the encapsulation mode.
2. dynamic desirable (the default)-The port actively attempts to convert the link into
trunguide mode. If the far-end switch port is configured to trunk, dynamic desirable,
or dynamic auto mode, trunguide is successfully negotiated.
3. dynamic auto-The port converts the link into trunguide mode. If the far-end
switch port is configured to trunk or dynamic desirable, trunguide is negotiated.
Because of the passive negotiation behavior, the link never becomes a trunk if both
ends of the link are left to the dynamic auto default.
QUESTION 33:
Two Certkiller switches are connected via a trunk link. In this network, the original
frame is encapsulated and an additional header is added before the frame is carried
over a trunk link. At the receiving end, the header is removed and the frame is
forwarded to the assigned VLAN. This describes which technology?
A. DISL
B. ISL
C. DTP
D. IEEE 802.1Q
E. MPLS
F. None of the above

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