Which statement is true about the capabilities of a voice gateway router？（）A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packetsB、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN networkC、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phonesD、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
Which statement is true about the capabilities of a voice gateway router？（）
- A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packets
- B、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN network
- C、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phones
- D、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
相关考题：
Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?() A.Advanced call-handling software, such as Cisco UnityB.Call-management hardware and software, such as CiscoCallManagerC.Client-based software, such as CiscoSoftPhoneD.Voice gateways, such as the Cisco VG248 Analog Phone Gateway
Which two statements about voice VLANs are correct？（）A、Voice VLANs eliminate the need for QoS configurationB、Voice VLANs are used on trunk links to eliminate the need for QoS CoS markingsC、Voice VLANs are mainly used to reduce the number of access switch ports that are used in the networkD、Voice VLANs can be configured to forward existing CoS priorities or override themE、Voice VLANs are mainly used between access layer switches and distribution layer switchesF、Voice VLANs can be configured on Layer 2 ports only
When analog signals are digitized using the G.711 codec， voice samples are encapsulated into protocol data units （PDUs） involving which three headers？ （）A、IPB、TCPC、RTPD、UDPE、H323F、CRTP
Which two VoIP capabilities are utilized when the CallManager and the gateway are configured for Survivable Remote Site Telephony？（）A、 Analog phones， connected to the PSTN， act as internal call agents if IP communication to the CallManager is lost.B、 An onsite gateway reroutes calls over the PSTN if IP communication to the CallManager is lost.C、 The IP phones can reroute calls over the PSTN if IP communication to the CallManager is lost.D、 Local voice gateways can assume the function of a call agent if IP communication to the CallManager is lost.E、 IP phones use an internal call agent if IP communication to the CallManager is lost.
Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）A、The three required steps in the analog to digital conversion are sampling，encoding，and compression.B、The three required steps in the analog to digital conversion are sampling，quantization，and compression.C、The three required steps in the analog to digital conversion are sampling，quantization，and encoding.D、The output of the sampling process is a pulse code modulation （PCM） signal.E、The output of the sampling process is a pulse amplitude modulation （PAM） signal.
Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）A、Advanced call-handling software, such as Cisco UnityB、Call-management hardware and software, such as CiscoCallManagerC、Client-based software, such as CiscoSoftPhoneD、Voice gateways, such as the Cisco VG248 Analog Phone Gateway
Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）A、Client-based software, such as CiscoSoftPhoneB、Voice gateways, such as the Cisco VG248 Analog Phone GatewayC、Call-management hardware and software, such as CiscoCallManagerD、Advanced call-handling software, such as Cisco Unity
Which statement is true about the comparison of voice traffic with video traffic？（）A、 Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.B、 Latency requirements are less stringent for video traffic than for voice traffic.C、 Video traffic is less sensitive to dropped packets than for voice traffic.D、 Video traffic requires the retransmission capabilities of TCP whereas voice uses UDP.E、 Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.F、 Voice traffic requires the retransmission capabilities of TCP whereas video uses UDP.
Which two statements are true about voice ports on a router？ （）A、 Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.B、 Calls to the PSTN can be made via FXS or T1/E1 trunk ports.C、 Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.D、 Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.
Which three functions are associated with a Cisco Unified CallManager？ （）A、 connects traditional telephony devices to voice over IP infrastructureB、 converts analog signals to digital formatC、 performs voice compressionD、 performs call processingE、 performs dial plan administrationF、 performs signaling and device control
Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）A、 Packets can arrive out of order.B、 Packets must take the same path to the destination.C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.D、 Packets can experience varying delays across the network.E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.
Which two are functions of an IP voice gateway?（）A、provide far-end call control B、provide far-end camera control C、translate analog voice to packetized voice D、transition call path between different networks E、provide locations-based call admission control
Which statement is true about the comparison of voice traffic with video traffic？（）A、video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flowsB、latency requirements are less stringent for video traffic than for voice trafficC、video traffic is less sensitive to dropped packets than for voice trafficD、video traffic requires the retransmission capabilities of TCP whereas voice uses UDPE、video traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flowsF、voice traffic requires the retransmission capabilities of TCP whereas video uses UDP
Which statement is true about voice VLANs？ （）A、When the voice VLAN feature is enabled， all untagged voice and data traffic is sent through the voice VLAN.B、The voice VLAN feature is enabled by default.C、The IP phone overrides the priority of all incoming data traffic （tagged and untagged） and sets the CoS value to 0.D、The default CoS value is 1 for incoming voice and data traffic.
Which statement describes the distributed call control model in VoIP networks？（）A、The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownB、The gateway voice-capable device has a local call routing table configured through a routing protocol.C、The gateway voice-capable device relies on a call agent to support call control.D、The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
Which three functions can an Integrated Services Router perform in a VoIP network？（）A、 voice stream mixing for conference callingB、 voice gatewayC、 call admission controlD、 analog or digital phone interfacesE、 XML application servicesF、 large scale dial plan application
What are two steps that are taken when a router converts a voice signal from analog to digital form？（）A、samplingB、packetizationC、quantizationD、serialization
单选题Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）AAdvanced call-handling software, such as Cisco UnityBCall-management hardware and software, such as CiscoCallManagerCClient-based software, such as CiscoSoftPhoneDVoice gateways, such as the Cisco VG248 Analog Phone Gateway
单选题Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）AClient-based software, such as CiscoSoftPhoneBVoice gateways, such as the Cisco VG248 Analog Phone GatewayCCall-management hardware and software, such as CiscoCallManagerDAdvanced call-handling software, such as Cisco Unity
多选题Which two are functions of an IP voice gateway?（）Aprovide far-end call controlBprovide far-end camera controlCtranslate analog voice to packetized voiceDtransition call path between different networksEprovide locations-based call admission control
多选题When analog signals are digitized using the G.711 codec， voice samples are encapsulated into protocol data units （PDUs） involving which three headers？ （）AIPBTCPCRTPDUDPEH323FCRTP
单选题What are two steps that are taken when a router converts a voice signal from analog to digital form？（）A samplingB packetizationC quantizationD serialization
多选题Which three functions are associated with a Cisco Unified CallManager？ （）Aconnects traditional telephony devices to voice over IP infrastructureBconverts analog signals to digital formatCperforms voice compressionDperforms call processingEperforms dial plan administrationFperforms signaling and device control
单选题Which statement is true about the capabilities of a voice gateway router？（）Avoice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packetsBvoice gateways need a gatekeeper to interconnect the VoIP networks the PSTN networkCvoice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phonesDvoice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
多选题Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）AThe three required steps in the analog to digital conversion are sampling，encoding，and compression.BThe three required steps in the analog to digital conversion are sampling，quantization，and compression.CThe three required steps in the analog to digital conversion are sampling，quantization，and encoding.DThe output of the sampling process is a pulse code modulation （PCM） signal.EThe output of the sampling process is a pulse amplitude modulation （PAM） signal.
单选题Refer to the exhibit. Which statement is true about a voice VLAN？（）A Physically the voice network and the data network are separateB The voice traffic will normally be on a different IP subnet than will the data trafficC End user intervention is necessary to place the phone into the proper VLAND The same security policy should be implemented for both voice and data trafficE The data VLAN must be configured as the native VLAN
单选题Which statement is true about voice VLANs？ （）AWhen the voice VLAN feature is enabled， all untagged voice and data traffic is sent through the voice VLAN.BThe voice VLAN feature is enabled by default.CThe IP phone overrides the priority of all incoming data traffic （tagged and untagged） and sets the CoS value to 0.DThe default CoS value is 1 for incoming voice and data traffic.