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

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

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.

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

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.

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.

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

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