單項(xiàng)選擇題Which of these is a valid differentiated services PHB？ （）

A.Guaranteed PHB
B.Class-Selector PHB
C.Reserved Forwarding PHB
D.Discard Eligible PHB
E.Priority PHB


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1.多項(xiàng)選擇題Which two of these are differences between traffic policing and traffic shaping？（）

A.with traffic shaping，a router stores excess traffic in packet buffers until bandwidth is available again
B.with policing you can tune the buffer usage for traffic exceeding the specified CIR
C.with shaping you can tune the buffer usage for traffic exceeding the specified CIR
D.shaping should only be applied for ingress traffic，policing only for egress
E.policing uses a token bucket algorithm，shaping uses an SPD algorithm

2.單項(xiàng)選擇題You are designing your network to be able to use trunks. As part of this process you are comparing the ISL and 802.1Q encapsulation options. All of these statements about the two encapsulation options are correct except which one？（）

A.Both support normal and extended VLAN ranges.
B.ISL is a Cisco proprietary encapsulation method and 802.1Q is an IEEE standard.
C.ISL encapsulates the original frame.
D.Both support native VLANs.
E.802.1Q does not encapsulate the original frame.

3.單項(xiàng)選擇題

Refer to the exhibit. What is the overall type of queuing being used on the outgoing data for interface Ethernet0/1? （）

A.LLQ
B.FIFO
C.CBWFQ
D.priority queuing
E.weighted fair queuing
F.IP RTP priority queuing

4.多項(xiàng)選擇題Which three of these statements about Dynamic Trunking Protocol are correct？（）

A.It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
B.It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
C.It is a point-to-multipoint protocol.
D.It is a point-to-point protocol.
E.It is not supported on private VLAN ports or tunneling ports.

5.單項(xiàng)選擇題Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？（）

A.802.1D bridges do not relay BPDUs.
B.802.1w bridges do not relay BPDUs.
C.802.1D bridges only relay BPDUs received from the root.
D.802.1w bridges only relay BPDUs received from the root.

7.多項(xiàng)選擇題Under which two circumstances would an RSTP bridge flush its CAM table？（）

A.upon a port state change
B.upon receiving a topology change notification
C.when transitioning from discarding to forwarding
D.when transitioning from forwarding to discarding
E.only when changing from listening to discarding
F.when CAM resources have been completely used up

8.單項(xiàng)選擇題Why does RSTP have a better convergence time than 802.1D？（）

A.it is newer
B.it has smaller timers
C.it has less overhead
D.it is not timer-based

9.單項(xiàng)選擇題

Refer to the exhibit. Which of these is applied to the Bearer class？（）

A.WRED
B.traffic shaping
C.packet marking
D.packet classification
E.FIFO queuing within the class

10.單項(xiàng)選擇題

Refer to the exhibit. Which switching feature is being tested？（）

A.loop guard
B.PortFast
C.root guard
D.BDPU guard