Product Description
Exam Number/Code: 642-812
Exam name: Building Cisco Multilayer Switched Networks
642-812 test is the important of Cisco certifaction. Only you pass the 642-812 exam you could have the chance to get Cisco certifaction. To help examinee, Exambible publish the Questions and Answers about 642-812 exam. And the 227 simulation exam are all designed by expert from Exambible. Examinees could have an enough prepare by these simulation exercises and pass the 642-812 test successfully.
Exambible also provide free 642-812 Demo, examinees can download and use before buying 642-812 Q&As, then decide if they need to purchase.
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Cisco CCNP 642-812 Web Demo
This webdemo is just a demo data, only for reference and learning, there is no other purposes.
1. Refer to the exhibit. What is the effect on the trust boundary of
configuring the command mls qos trust cos on the switch port that is
connected to the IP phone?
A. Effectively the trust boundary has been moved to the IP phone.
B. The host is now establishing the CoS value and has effectively become the trust boundary.
C. The switch is rewriting packets it receives from the IP phone and determining the CoS value.
D. The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set the CoS.
E. RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.
Answer: A
2.Which three WLAN statements are true? (Choose three.)
A. A lightweight AP receives control and configuration from a WLAN controller to which it is associated.
B. A WLAN client that is operating in half-duplex mode will delay all clients in that WLAN.
C. Ad hoc mode allows mobile clients to connect directly without an intermediate AP.
D. Another term for infrastructure mode is independent service set (IBSS).
E. The Aironet 1230 access point is an example of an access point that operates solely as a lightweight access point.
F. WLANs are designed to share the medium and can easily handle an increased demand of channel contention.
Answer: ABC
3. Which statement is true about RSTP topology changes?
A. Any change in the state of the port generates a TC BPDU.
B. Only nonedge ports moving to the forwarding state generate a TC BPDU.
C. If either an edge port or a nonedge port moves to a block state, then a TC BPDU is generated.
D. Only nonedge ports moving to the blocking state generate a TC BPDU.
E. Any loss of connectivity generates a TC BPDU.
Answer: B
4. Refer to the exhibit. What is the effect when the switchport
priority extend cos 3 command is configured on the switch port
interface connected to the IP phone?
A. Effectively, the trust boundary has been moved to the PC attached to the IP phone.
B. The computer is now establishing the CoS value and has effectively become the trust boundary.
C. The IP phone is enabled to override with a CoS value of 3 the existing CoS marking of the PC attached to the IP phone.
D. The switch will no longer tag incoming voice packets and will extend the trust boundary to the distribution layer switch.
E. RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.
Answer: C
5. Which statement about the Lightweight Access Point Protocol (LWAPP) is true?
A. LWAPP encrypts control traffic between the AP and the controller.
B. LWAPP encrypts user traffic with a x.509 certificate using AES-CCMP.
C. LWAPP encrypts both control traffic and user data.
D. When set to Layer 3, LWAPP uses a proprietary protocol to communicate with the Cisco Aironet APs.
Answer: A
6. Refer to the exhibit. Switch S2 contains the default configuration.
Switches S1 and S3 both have had the command spanning-tree mode
rapid-pvst issued on them. What will be the result?
A. Switches S1 and S3 will be able to exchange traffic but neither will be able to exchange traffic with Switch S2
B. Switches S1, S2, and S3 will be able to pass traffic between
themselves. However, if there is a topology change, Switch S2 will not
receive notification of the change.
C. Switches S1, S2, and S3 will be able to pass traffic among themselves.
D. IEEE 802.1D and IEEE 802.1w are incompatible. All three switches
must use the same standard or no traffic will pass between any of the
switches.
Answer: C
7. Which statement is true about IP telephony calls?
A. A Voice over IP (VoIP) packet consists of the voice payload, IP header, TCP header, RTP header, and Layer 2 link header.
B. The voice carrier stream uses H.323 to set up, maintain, and tear down call endpoints.
C. Call control signaling uses Real-Time Transport Protocol (RTP) packets that contain actual voice samples.
D. The sum of bandwidth necessary for each major application, including
voice, video, and data, should not exceed 75 percent of the total
available bandwidth for each link.
Answer: D
8. Refer to the exhibit. Switch S1 has been configured with the command
spanning-tree mode rapid-pvst. Switch S3 has been configured with the
command spanning-tree mode mst. Switch S2 is running the IEEE 802.1D
instance of Spanning-Tree. What will be the result?
A. IEEE 802.1w, and IEEE 802.1s are compatible. IEEE 802.1d is
incompatible. Switches S1 and S3 will be able to pass traffic between
themselves. Neither will be able to pass traffic to Switch S2.
B. Switches S1, S2, and S3 will be able to pass traffic between themselves.
C. Switches S1, S2, and S3 will be able to pass traffic between
themselves. However, if there is a topology change, Switch S2 will not
receive notification of the change.
D. IEEE 802.1d, IEEE 802.1w, and IEEE 802.1s are incompatible. All
three switches must use the same standard or no traffic will pass
between any of the switches.
Answer: B
