单项选择题How does weighted random early detection (WRED) prevent packet loss?()

A.increases link capacity
B.increases buffer space to accommodate bursts of traffic from delay-sensitive applications
C.provides prioritized forwarding for drop-sensitive applications
D.drop lower priority packets before congestion occurs
E.separates traffic into as many as 64 queues that can be uniquely prioritized


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1.单项选择题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 separate
B.RTP provides end-to-end delivery services for voice traffic
C.UDP is used to ensure a reliable transmission from sender to receiver
D.RTP is used to provide resource reservation for the voice stream
E.UDP provides multiplexing

2.单项选择题

Refer to the wxhibit . what QOS model should be used to reserve the requested bandwidth and delay needed for each allowed VOIP call regardless of changing networkconditions?()

A.best-effort delivery
B.ingress committed rate (ICR)
C.shaping and policing
D.egress committed rate (ECR)
E.integrated Services (IntServ)
F.differentiated services (DiffServ)

3.多项选择题Which two Cisco router functional planes are protected by Control Plane Policing (COPP)?()

A.data plane
B.control plane
C.service plane
D.management plane
E.hyper plane

4.多项选择题What are two step needed to define a QoS policy for a traffic class?()

A.determine a minimum bandwidth guarantee
B.determine interfaces to which to apply policy
C.assign priorities to the class
D.configure access control lists

5.多项选择题Which three statements about classification marking of traffic at Layer 2 are true? ()

A.a Frame Relay header includes a 1-bit discard eligible (DE) bit to provide the class of service (CoS)
B.an ATM header includes a 1-bit DE field to provide the CoS
C.an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoS
D.the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link (ISL) trunking is used
E.in the IEEE 802.1p standard, three bits are used to identify the user priority bits for the CoS
F.in the IEEE 802.1q standard, six bits are used to identify the user priority bits for the CoS

7.单项选择题

Refer to the exhibit. What mechanism should be used to increase the bandwidth availability and optimize the link usage throughout the network for voice traffic?()

A.TCP header compression on router R1
B.TCP header compression on router R2
C.RTP header compression on router R1
D.RTP header compression on router R2
E.payload header compression on router R1
F.payload header compression on router R2

8.多项选择题AutoQoS Discovery has run on the Acme Entertainment Company’s network for several days and has produced the suggested policy shown in the exhibit. Acme wishes to 1) allow more bandwidth for browser-type traffic because it is the job of many of their employees to be browsing the web as a part of their job, and 2) to allow greater bandwidth for file transfers because they expect an upcoming surge in movie uploads and downloads. Which two statements would you replace to best accomplish those goals without sacrificing voice quality? ()

A.in class class-default, replace fair-queue with bandwidth remaining percent 50 
B.in class autoqos-transactional-Fa0/1, replace bandwidth remaining percent 40 with bandwidth remaining percent 20 
C.in class autoqos-transactional-Fa0/1, replace bandwidth remaining percent 40 with bandwidth remaining percent 30 
D.in class autoqos-Bulkl-Fa0/1, replace bandwidth remaining percent 19 with bandwidth remaining percent 25 
E.in class autoqos-Scavenger-Fa0/1, replace bandwidth remaining percent 1 with bandwidth remaining percent 10 
F.in class autoqos-Signaling-Fa0/1, replace bandwidth remaining percent 4 with bandwidth remaining percent 1 

9.多项选择题What are three considerations when choosing the QoS model to deploy in a network?()

A.the routing protocols being utilized in the network
B.the applications utilizing the network
C.the traffic destinations
D.network addressing scheme
E.cost of implementation
F.the amount of the control needed of the resources

10.多项选择题

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?()

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

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