單項選擇題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.


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1.單項選擇題What is the purpose of the STP PortFast BPDU guard feature? ()

A.enforce the placement of the root bridge in the network
B.ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C.enforce the borders of an STP domain
D.ensure that any BPDUs received are forwarded into the STP domain

2.多項選擇題Which two commands are required to enable multicast on a router, knowing that the receivers only support IGMPv2?()

A.ip pim rp-address
B.ip pim ssm
C.ip pim sparse-mode
D.ip pim passive

3.多項選擇題Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D?()

A. Designated Root Cost
B. bridge ID priority
C. max age
D. bridge ID MAC address
E. Designated Root Priority
F. forward delay

4.單項選擇題Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these?()

A. one global STP instance for all VLANs
B. one STP instance for each VLAN
C. one STP instance per set of VLANs
D. one STP instance per set of bridges

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