多选题Which two statements are true about Voice over IP (VoIP) packet delivery in a digital infrastructure? ()APackets can arrive out of order.BPackets must take the same path to the destination.COnce packets are received at the destination router, the router performs sampling to ensure the quality of the voice traffic.DPackets can experience varying delays across the network.EPackets containing voice samples are sequentially numbered by default, allowing for reordering upon arrival at the terminal router along the path.

多选题
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.


参考解析

解析: 暂无解析

相关考题:

Which two statements are true about AH?() (Choose two.) A. AH provides data integrity.B. AH is identified by IP protocol 50.C. AH is identified by IP protocol 51.D. AH cannot work in conjunction with ESP

【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip(Voip). But it appears the industry has settled on the termVoice ove IP in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet(DSL or cable modem)connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】From the paragraph above,a popular service that has attracetd the interest of companies and home users,is termed as () . The data transfer over the Internet is controlled by the () . At corporate level, many companies have replaced their older internal telephone systerms with () that oprerate over a local area network.A、voice over the internet B、voice over packet C、Voice over IP D、internet telephony A、packet B、internet protocol C、industry D、VoIp servers A、VoIP systems B、IP-enablde telephones C、VoIP servers D、routers

Which two statements are true about voice packets in a LAN? (Choose two.)  ()A、 Voice traffic data flow involves large volumes of large packets.B、 Because a packet loss involves a small amount of data, voice traffic is less affected by packet losses than traditional data traffic is.C、 Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media portion of VoIP communication.D、 Voice packets are very sensitive to delay and jitter.E、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

Which two statements are true about the protocols that are used for transmitting voice traffic?()A、RTP multiplexing is used to keep multiple phone conversations separateB、RTP provides end-to-end delivery services for voice trafficC、UDP is used to ensure a reliable transmission from sender to receiverD、RTP is used to provide resource reservation for the voice streamE、UDP provides multiplexing

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 two statements best describe Cisco IOS IP SLA?()A、only implemented between Cisco source and destination-capable devicesB、statistics provided by syslog, CLI, and SNMPC、measures delay, jitter, packet loss, and voice qualityD、only monitors VoIP traffic flowsE、provides active monitoringF、provides passive monitoring

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 statements are true about voice VLANs?()A、Voice VLANs are only used when connecting an IP phone and a host to distinct switch portsB、Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phonesC、Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phoneD、Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration commandE、Voice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the portF、Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings

Which two statements are true about overflow pools?()A、Overflow pools do not support PATB、Overflow pools can not use the egress interface IP address for NATC、Overflow pools must use PATD、Overflow pools can contain the egress interface IP address or separate IP addresses

VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN?()A、 Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media  portion of the VoIP communication.  B、 Voice traffic data flow involves large volumes of large packets.  C、 Because a packet loss involves a small amount of data, voice traffic is less affected by packet  losses than traditional data traffic is.  D、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during  delivery. E、 Voice packets are very sensitive to delay and jitter.

Which two statements about static NAT are true? ()(Choose two.)A、Static NAT can only be used with destination NAT.B、Static NAT rules take precedence over overlapping dynamic NAT rules.C、NAT rules take precedence over overlapping static NAT rules.D、A reverse mapping is automatically created.

Which two statements are true about the configuration of voice VLANs?()A、Static secure MAC addresses can be configured in conjunction with voice VLANs.B、PortFast is automatically enabled when voice VLANs are configured.C、PortFast must be manually configured when voice VLANs are configured.D、Voice VLANs are typically configured on uplink ports.E、Voice VLANs are typically configured on access ports.

Which two statements are true about the digital audio in a VoIP network? ()A、 Standard encoding techniques create an uncompressed digital data rate of 4000 bps.B、 Standard encoding techniques create an uncompressed digital data rate of 8000 bps.C、 Standard encoding techniques create an uncompressed digital data rate of 64,000 bps.D、 Voice quality is not a concern if compression is not used.E、 Two methods of quantization are linear and logarithmic.F、 Two methods of compression are u-law and a-law.

Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true?()A、the SDM QoS wizard will create two real-time traffic classes to handle VoIP, voice signaling, and video packetsB、the SDM QoS wizard will create three real-time traffic classes to handle VoIP, voice signaling, video, and video packetsC、the SDM QoS wizard will create four real-time traffic classes to handle VoIP, voice signaling, video, and video streaming packetsD、the SDM QoS wizard will create two business-critical traffic classes to handle transactional and  network management packetsE、the SDM QoS wizard will create three business-critical traffic classes to handle transactional, network management, and routing packetsF、the SDM QoS wizard will create four business-critical traffic classes to handle transactional, network management, routing, and best-effort packets

Which two statements are true about network voice traffic? (Choose two.)()A、 Voice traffic is affected more by link speed than FTP traffic is.B、 Voice traffic is affected more by packet delays than FTP traffic is.C、 Voice streams involve larger packet sizes than most TCP network traffic involves.D、 Voice traffic is more sensitive to packet loss than TCP network traffic is.E、 Voice traffic requires QOS mechanisms only in heavily loaded network segments.

Which two statements about OSPF IPv6 routing are true?()A、It requires OSPF version 3.B、automatically detects neighbors over NHMA interfacesC、It supports encryption usingD、It uses LSA type 9E、It uses LSA type 8

多选题Which two statements about forwarding equivalence class (FEC) are true?()AFEC might correspond to a destination IP subnet, but it might also correspond to any traffic class that the edge LSR considers significant.BFEC is a group of IP packets that is forwarded over a different path, but with the same forwarding treatment.CFEC is a group of IP packets that is forwarded over the same path, and with the same forwarding treatment.DFEC is a group of IP packets that is forwarded over a different path, but with the different forwarding treatment.EFEC is a group of IP packets that is forwarded over the same path, but with a different forwarding treatment

多选题Which two statements are true about the configuration of voice VLANs?()AStatic secure MAC addresses can be configured in conjunction with voice VLANs.BPortFast is automatically enabled when voice VLANs are configured.CPortFast must be manually configured when voice VLANs are configured.DVoice VLANs are typically configured on uplink ports.EVoice VLANs are typically configured on access ports.

多选题Which two statements are true about AH?() (Choose two.)AAH provides data integrity.BAH is identified by IP protocol 50.CAH is identified by IP protocol 51.DAH cannot work in conjunction with ESP

多选题VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN?()AVoice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media  portion of the VoIP communication.BVoice traffic data flow involves large volumes of large packets.CBecause a packet loss involves a small amount of data, voice traffic is less affected by packet  losses than traditional data traffic is.DVoice packets are encapsulated in TCP segments to allow for proper sequencing during  delivery.EVoice packets are very sensitive to delay and jitter.

多选题Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true? ()AThe SDM QoS wizard will create two real-time traffic classes to handle VoIP and voice signaling packets.BThe SDM QoS wizard will create three real-time traffic classes to handle VoIP, voice signaling, and video packets.CThe SDM QoS wizard will create four real-time traffic classes to handle VoIP, voice signaling, video, and video streaming packets.DThe SDM QoS wizard will create two business-critical traffic classes to handle transactional and network management packets.EThe SDM QoS wizard will create three business-critical traffic classes to handle transactional, network management, and routing packets.FThe SDM QoS wizard will create four business-critical traffic classes to handle transactional, network management, routing, and best-effort packets.

多选题Which two statements are true about voice ports on a router?()ACalls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.BCalls to the PSTN can be made via FXS or T1/E1 trunk ports.CAnalog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.DCalls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.

多选题Which two statements are true about voice VLANs?()AVoice VLANs are only used when connecting an IP phone and a host to distinct switch portsBAccess ports that are configured with voice VLANs will always trust the CoS that is received from IP phonesCAccess ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phoneDVoice VLANs are configured using the switchport voice vlan vlan-ID interface configuration commandEVoice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the portFEnabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings

多选题Which three statements about NetFlow are true?()ANetFlow records unidirectional IP traffic flow.BNetFlow records MPLS frame flow.CNetFlow expert is only over TCP.DNetFlow records is only over UDP.ENetFlow records subinterface information of traffic flow.

多选题Which two statements are true about voice packets in a LAN? (Choose two.)  ()AVoice traffic data flow involves large volumes of large packets.BBecause a packet loss involves a small amount of data, voice traffic is less affected by packet losses than traditional data traffic is.CVoice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media portion of VoIP communication.DVoice packets are very sensitive to delay and jitter.EVoice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

单选题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.

多选题Which two statements about static NAT are true? ()(Choose two.)AStatic NAT can only be used with destination NAT.BStatic NAT rules take precedence over overlapping dynamic NAT rules.CNAT rules take precedence over overlapping static NAT rules.DA reverse mapping is automatically created.

多选题Which two statements best describe Cisco IOS IP SLA?()Aonly implemented between Cisco source and destination-capable devicesBstatistics provided by syslog, CLI, and SNMPCmeasures delay, jitter, packet loss, and voice qualityDonly monitors VoIP traffic flowsEprovides active monitoringFprovides passive monitoring