Product Description
Exam Number/Code: 642-845
Exam name: Optimizing Converged Cisco Networks
642-845 test is the important of Cisco certifaction. Only you pass the 642-845 exam you could have the chance to get Cisco certifaction. To help examinee, Exambible publish the Questions and Answers about 642-845 exam. And the 176 simulation exam are all designed by expert from Exambible. Examinees could have an enough prepare by these simulation exercises and pass the 642-845 test successfully.
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Cisco 642-845
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1. Which two statements are true about the implementation of QoS? (Choose two.)
A. Implementing DiffServ involves the configuration of RSVP.
B. Implementing IntServ allows QoS to be performed by configuring only the ingress and egress devices.
C. Implementing IntServ involves the utilization of RSVP.
D. Traffic should be classified and marked by the core network devices.
E. Traffic should be classified and marked as close to the edge of the network as possible.
Answer: CE
2.Which codec standard would provide the highest voice-quality, mean opinion score (MOS)?
A. G.711, PCM
B. G.728, LDCELP
C. G.729, CS-ACELP
D. G.729A, CS-ACELP
Answer: A
3. Which two statements are true about the function of CAC? (Choose two.)
A. CAC provides guaranteed voice quality on a link.
B. CAC artificially limits the number of concurrent voice calls.
C. CAC is used to control the amount of bandwidth that is taken by a call on a link.
D. CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.
E. CAC allows an unlimited number of voice calls while severely restricting, if necessary, other forms of traffic.
F. CAC solves voice congestion problems by using QoS to give priority to UDP traffic.
Answer: BD
4. Voice activity detection (VAD) suppresses the transmission of
silence patterns. On average, and assuming that a link carries at least
24 calls, what percentage of total bandwidth could VAD save?
A. 5
B. 15
C. 25
D. 35
E. 45
F. 55
Answer: D
5. Which two QoS statements are true about the use of the SDM QoS wizard? (Choose two.)
A. Business-critical traffic includes VoIP and voice signaling packets.
B. SDM can be used to configure a basic QoS policy for incoming traffic on WAN interfaces and IPsec tunnels.
C. SDM can provide QoS for real-time traffic and business-critical traffic.
D. SDM creates a custom-queuing (CQ) or a priority-queuing (PQ) policy.
E. SDM creates a low latency queuing (LLQ) service policy with its associated classes.
F. When allocating bandwidth, values can be entered in either bandwidth percentage or kilobytes per second (kBps).
Answer: CE
6. Which two statements regarding the Wireless LAN Solution Engine (WLSE) are true? (Choose two.)
A. To support fault and policy reporting, the WLSE requires a Wireless Control System (WCS).
B. When WLSE detects an AP failure, it automatically increases the power and cell coverage of nearby APs.
C. WLSE requires the 2700 location appliance to offer location tracking.
D. WLSE can locate rogue APs and automatically shut them down.
E. WLSE configuration is done using the command line interface (CLI) or a WEB based template.
Answer: BD
7. Two sites are using a multisite centralized call processing model.
The voice gateway on the remote branch has lost IP connectivity to its
Cisco CallManager server. Which feature enables the remote gateway to
take the role of the call agent during the WAN failure?
A. automated alternate routing (AAR)
B. Cisco CallManager Attendant Console
C. real-time protocol (RTP)
D. Survivable Remote Site Telephony (SRST)
Answer: D
8. Refer to the exhibit. Both routers have been configured as VoIP
gateways. They must also support traditional telephony devices to
connect to analog telephones. Which two configuration changes would
correctly support the voice requirements? (Choose two.)
A. On each router, under the dial-peer voice 1 pots configuration, add the port fa0/0 command.
B. On each router, under the dial-peer voice 1 pots configuration, add the port 1/0/0 command.
C. On each router, configure dial-peer voice 1 as a voip connection and configure dial-peer voice 2 as a pots connection.
D. Under the dial-peer voice 1 pots configuration, change the
destination pattern of 1111 to 2222 on the R1 router, and 2222 to 1111
on the R2 router.
E. Under the dial-peer voice 2 voip configuration, change the
destination pattern of 1111 to 2222 on the R1 router, and 2222 to 1111
on the R2 router.
F. Under the dial-peer voice 2 voip configuration, change the
destination target address of 10.2.2.2 to 10.1.1.1 on the R1 router,
and the destination target address of 10.1.1.1 to 10.2.2.2 on the R2
router.
Answer: BE
