多項選擇題Which two QoS statements are true about the use of the SDM QoS wizard？（）

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）.


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1.多項選擇題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

2.多項選擇題What are two reasons to implement H·323 gatekeepers？（）

A. to eliminate the need for VoIP gateways
B. to scale a VoIP installation with multiple gateways
C. to provide call admission control and limit the number of simultaneous calls on the network 
D. to meet the requirement to control H·323 gateways on a LAN
E. to accept call requests and reduce the load on the gateway

3.單項選擇題What is an advantage of the IntServ QoS model？（）

A. It supports admission control that allows a network to reject or downgrade new RSVP sessions if one of the interfaces in the path has reached the limit （that is， all reservable bandwidth is booked）.
B. RSVP signals QoS requests per individual flow. In the request the authorized user （authorization object） and needed traffic policy （policy object） are sent. The network can then provide best-effort delivery to these individual flows.
C. RSVP streamlines communication by making it unnecessary to inform network devices of flow parameters （IP addresses and port numbers）.
D. Because of the stateful RSVP architecture， continuous signaling does not have to occur.
E. The flow-based approach is scalable to large implementations， such as the public Internet， because RSVP tracks each individual flow.

4.多項選擇題Which two functions can be provided by an Integrated Services Router （ISR） in a VoIP network？（）

A. ISR can perform the functions of a multipoint control unit to facilitate voice conferencing.
B. ISR can perform the function of a call agent in the event of loss of communication with a CallManager.
C. ISR can provide XML applications to the phones.
D. ISR can provide all of the functionality of a CallManager in the event of loss ofcommunication to the CallManager.
E. ISR can act as a voice gateway to the PSTN.

5.多項選擇題Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）

A. Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.
B. Channel-associated signaling utilizes a separate TDM channel for transmitting control signals.
C. Common channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.
D. Common channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.
E. ISDN BRIs implement channel-associated signaling.

7.多項選擇題What are two ways to minimize the delay of VoIP packets that are traversing a network？ （）

A. Use WFQ， CBWFQ， and LLQ to prioritize delay-sensitive packets.
B. Use WFQ， CBWFQ， and LLQ to compress the payload.
C. Give TCP packets priority over UDP packets.
D. Use control plane policing for cRTP queuing.
E. Use stacker and predictor to compress the payload.

8.多項選擇題Which two QoS classification and marking statements are true？ （）

A. In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B. In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.
C. In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D. The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E. The 802.1Q standard uses a three bit field referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

9.單項選擇題Which of the items stated is typically the most expensive method of improving QoS across WAN links？（）

A. advanced queuing
B. data compression
C. header compression
D. increasing link capacity

10.多項選擇題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.