New actualtests ccnp 642-812 08152008

Building Converged Cisco Multilayer Switched Networks
Exam Number: 642-812
Associated Certifications: CCNP, CCIP, CCDP
Duration: 90 minutes
Available Languages: English
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A Certkiller switch port is configured as a trunk using 802.1Q encapsulation. Which
three statements regarding the IEEE 802.1Q standard are true? (Select three)

A. The packet is encapsulated with a 26 byte header and a 4 byte FCS.
B. The IEEE 802.1Q frame format adds a 4 byte field to an Ethernet frame.
C. The IEEE 802.1Q frame retains the original MAC destination address.
D. The IEEE 802.1Q frame uses multicast destination of 0×01-00-0c-00-00
E. The 802.1Q protocol uses point-to-point connectivity.
F. The 802.1Q protocol uses point-to-multipoint connectivity.

Answer: B, C, E

Explanation:
802.1Q frames add 4 bytes to the Ethernet frame. The original MAC address is left
unaltered so the destination MAC is not changed. Trunks are always defined in a point to
point configuration, with two switch ports used as the endpoints.
Incorrect Answers:
A: This describes the frame that is added to an ISL encapsulated frame, not an 802.1Q
frame.
D: The destination MAC address is not altered when trunks are configured.
F: All trunks are always configured in a point to point fashion, there is no method
available to support point to multipoint trunk configurations.
QUESTION 54:

Which DTP switchport mode parameter would you use to set a switch port to
actively send and respond to DTP negotiation frames on switch CK1 ?

A. access
B. trunk
C. no negotiate
D. dynamic desirable
E. dynamic auto

Answer: D

Explanation:
There are five DTP switchport modes, and you should be familiar with all of them.
Access: This puts the interface (access port) into permanent nontrunguide mode.

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The interface will generate DTP frames, negotiating with the neighboring interface to
convert the link into a nontrunk link. The interface becomes a nontrunk interface even if
the neighboring interface does not agree to the change.
Dynamic Desirable: The interface actively attempts to convert the link to a trunk link.
The interface becomes a trunk interface if the neighboring interface is set to trunk,
desirable, or auto mode. This is the default mode for all Ethernet interfaces. If the
neighboring interface is set to the access or non-negotiate mode, the link will become a
non-trunguide link.
Dynamicauto: This command makes the interface willing to convert the link to a trunk
link if the neighboring interface is set to trunk or desirable mode. Otherwise, the link will
become a non-trunguide link.
Switchport mode trunk: This command puts the interface into permanent trunguide mode
and negotiates to convert the link into a trunk link. The interface becomes a trunk
interface even if the neighboring interface does not agree to the change.
Switchport nonegotiate: Prevents the interface from generating DTP frames. You can use
this command only when the interface switchport mode is access or trunk. You must
manually configure the neighboring interface as a trunk interface to establish a trunk link;
otherwise the link will be a non-trunguide link.

QUESTION 55:

A switch port on CK1 is being configured to support 802.1Q trunguide. Which of the
following are true about 802.1Q trunguide? (Select one)

A. Both switches must be in the same VTP domain.
B. The encapsulation type of both ends of the trunk does not have to match.
C. The native VLAN on both ends of the trunk must be VLAN 1.
D. 802.1Q trunguide can only be configured on a Layer 2 port.
E. In 802.1Q trunguide, all VLAN packets are tagged on the trunk link, except the native
VLAN.

Answer: E

Explanation:
E is correct because, “frames from the native VLAN of an 802.1Q trunk are not tagged
with the VLAN number.”
Incorrect Answers:
A: This is true for VTP information to be propagated, but it is not necessary for two
switches to be trunked together.
B: This is incorrect because the encapsulations types do have to match or it won’t work
properly. You can’t use 802.1Q on one side and ISL on the other. C is incorrect because
the native VLAN doesn’t necessarily have to be VLAN 1.
C: By default, the native VLAN is VLAN 1 but this can be effectively changed to a
different VLAN and the trunk will still be functional.
D: Trunks can be established with router interfaces using sub-interfaces, which are layer
3.
Reference: http://www.cisco.com/warp/public/473/27.html

QUESTION 56:

A Certkiller switch is configured for 802.1Q trunguide. What are valid characteristics
of IEEE 802.1Q? (Select all that apply)

A. Use frame tagging.
B. None of the answers
C. It is a method for identifying VLANs
D. It inserts VLAN identifier into the frame header

Answer: A, C, D

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