多項選擇題Modified deficit round robin supports which of these functionalities？（）

A.priority queue
B.weighted fair queues
C.round-robin service of output queues
D.LLQ


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1.單項選擇題Which of these statements best describes the major difference between an IPv4-compatible tunnel and a 6to4 tunnel？（）

A.An IPv4-compatible tunnel is a static tunnel， but an 6to4 tunnel is a semiautomatic tunnel.
B.The deployment of a IPv4-compatible tunnel requires a special code on the edge routers， but a 6to4 tunnel does not require any special code.
C.An IPv4-compatible tunnel is typically used only between two IPv6 domains， but a 6to4 tunnel is used to connect to connect two or more IPv6 domains.
D.For an IPv4-compatible tunnel， the ISP assigns only IPv4 addresses for each domain， but for a 6to4 tunnel， the ISP assigns only IPv6 addresses for each domain.

2.單項選擇題NBAR supports all of these with the exception of which one？（）

A.HTTP
B.IP multicast
C.TCP flows with dynamically assigned port numbers
D.non-UDP protocols

3.單項選擇題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.