What can be used to maintain the voice quality on a link by limiting the number of calls that can be active at any given time？（）A、 Call Management Link AgentB、 Traffic policingC、 Call Admission ControlD、 QoS Link Congestion ManagementE、 Oversubscription L

第1题：

The Acme company has determined that during its busiest hours， the average number of internal VoIP calls across the WAN link is four （4）. Since this is an average， the WAN link has been sized for six （6） calls with no call admission control. What will happen when a seventh call is attempted across the WAN link？ （）

• A、the seventh call is routed via the PSTN
• B、the call is denied and the original six （6） calls remain
• C、the call is completed and the first call is dropped
• D、the call is completed， but all calls have quality issues
• E、the call is completed but the seventh call has quality issues

第2题：

An OSPF link can be in multiple states at any given moment （ie. Exstart， exchange， full）. Whichtwo IOS commands let you view the state of the link？（）

• A、show ip ospf
• B、show ip protocols
• C、show ip ospf neighbor
• D、show ip ospf interface

第3题：

The Cisco SDM will create a QoS policy that provides services to two types of traffic. Which two statements indicate the default QoS parameters that are created by SDM？（）

• A、 Business-critical traffic will be sorted into two QoS classes.
• B、 Real-time traffic will be sorted into one QoS class.
• C、 Voice traffic will be considered real-time traffic while call signaling will be considered business-critical.
• D、 All traffic except real-time will be considered best-effort.
• E、 Routing， management， and transactional traffic will be considered business-critical.
• F、 Voice and call signaling traffic will be considered real-time.

第4题：

What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）

• A、codec
• B、link speed
• C、Layer 2 encapsulation
• D、packet overhead （IP/UDP/RTP）
• E、link delay
• F、total number of simultaneous calls that are allowed

第5题：

What is the Cisco recommended setting for the Cisco Unified Wireless Network WLC Voice Call Admission Control Max RF Bandwidth to support the Cisco Unified Wireless IP Phone 7921G?（）

• A、nominally 30 percent to best align with Cisco Unified Communications System recommendations
• B、100 percent to ensure that the VoWLAN calls can use all the available bandwidth, if needed
• C、system default of 75 percent
• D、40 to 60 percent
• E、voice CAC should be left disabled unless wired QoS is configured

第6题：

A branch router is configured with an egress QoS policy that was designed for a total number of 10 concurrent VOIP calls.Due to expansion， 15 VOIP calls are now running over the link， but after the 14th call was established， allcalls were affected and the voice quality was dramatically degraded.Assuming that there is enough bandwidth on the link for all of this traffic， which part of the QoS configuration should be updated due to the new traffic profile？（）

• A、Increase the shaping rate for the priority queue.
• B、Remove the policer applied on the priority queue.
• C、Remove the shaper applied on the priority queue.
• D、Increase the policing rate for the priority queue.

第7题：

A branch router is configured with an egress QoS policy that was designed for a total number of 10 concurrent VOIP Calls. Due to Expansion， 15 VOIP Calls are now running over the link， but after the 14th call was established， all calls were affected and the voice quality was dramatically degraded. Assuming that there is enough bandwidth on the link for all of this traffic， which part of the QOS configuration should be updated due to the new traffic profile？（）

• A、Increase the shaping rate for the priority queue.
• B、Remove the policer applied on the priority queue.
• C、Remove the shaper applied on the preiority queue.
• D、Increase the policing rate for the priority queue.

第8题：

When designing a converged network， which measures can be taken at the building access layerto help eliminate latency and ensure end-to-end quality of service can be maintained？（）

• A、 rate limit voice traffic
• B、 configure spanning-tree for fast link convergence
• C、 isolate voice traffic on separate VLANs
• D、 classify and mark traffic close to the source

第9题：

Which three functions can an Integrated Services Router perform in a VoIP network？（）

• A、 voice stream mixing for conference calling
• B、 voice gateway
• C、 call admission control
• D、 analog or digital phone interfaces
• E、 XML application services
• F、 large scale dial plan application

第10题：

第11题：

第12题：

第13题：

Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

• A、 CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.
• B、 CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.
• C、 CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.
• D、 In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.

第14题：

Virtual PortChannels （vPCs） allow links that are physically connected to two different Cisco switches to appear to a third downstream device as coming from a single device and as part of a single port channel. Which of the following are components of a Virtual PortChannel system？ （）

• A、 Two peer devices： the vPC peers of which one is primary and one is secondary and are part of a vPC domain.
• B、 A Layer 3 Gigabit Ethernet link called peer-keepalive link to resolve dual-active scenarios
• C、 A redundant 10 Gigabit Ethernet PortChannel called a peer link to carry traffic from one system to the other when needed
• D、 vPC member ports forming the PortChannel
• E、 A dot1q trunk between the vPC peers
• F、 A management port that can be used as peer-keepalive link to resolve dual-active scenarios.

第15题：

To ensure voice packets are kept within the Committed Information Rate (CIR) of a Frame Relay link, what should be used in the CPE?（）

• A、prioritization
• B、classification
• C、fragmentation
• D、traffic shaping

第16题：

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 H323 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.

第17题：

What is the primary benefit of Single Number Reach？（）

• A、 Employees can receive calls at their desk and cell phone simultaneously.
• B、 Customers can call one number to reach all employees.
• C、 Employees can have their calls forwarded to the receptionist.
• D、 Customers can call any office number and the receptionist receives the call.

第18题：

Which of the following events can NOT be tuned via router configuration to provide for faster convergencefollowing a link failure？（）

• A、Failure detection
• B、Failure reporting
• C、IGP LSP/LSA originatio
• D、Per-hop flooding time of new link state
• E、Number of hops that need to be notified of new link state

第19题：

What are two components of the QoS Integrated Services （IntServ） model？（）

• A、 link efficiency
• B、 admission control
• C、 classification and marking
• D、 shaping and policing
• E、 congestion avoidance using the RTP protocol
• F、 resource reservation using the RSVP protocol

第20题：

Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality  of voice calls？（）

• A、Increase the queue size of the voice class.
• B、Guarantee bandwidth during congestion to the voice class with a bandwidth command.
• C、Increase the tx-ring of the egress interface.
• D、Implement LLQ for the voice class.
• E、Decrease the rx-ring of the egress interface.
• F、Decrease the queue size of the voice class.

第21题：

Which two statements are true about the function of CAC？（）

• 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.

第22题：

第23题：