单项选择题

What is jitter？（）

A.The total end-to-end delay
B.The variations of delay.
C.The delay caused by placing the bits on the wire.
D.The time it takes for the bits to transit the physical media.

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多项选择题

Which two statements regarding the IS-IS DIS election process are true？（）

A.A priority of 0 will prevent a router from becoming a DIS.
B.If the DIS becomes unavailable the backup DIS is promoted to DIS.
C.Adding a router with a higher priority than the current DIS will result in the new router becoming DIS.
D.Separate L1 and L2 election processes are held on a brodcast network.
E.L1 routers on a broadcast network only establish adjacencies with the DIS.
F.If there is a tie based on priority，the router whose attached interface has the lowest MAC address becomes the DIS.

单项选择题

Which MQC-based output queueing method is designed to support multiple traffic classes including VoIPtraffic， mission-critical traffic， bulk traffic， interactive traffic and default class traffic？（）

A.Custom Queueing
B.CB-WRED
C.WRR Queueing
D.LLQ
E.CBWFQ

单项选择题

What is the port number of an IPsec Encapsulating Security Payload packet？（）

A.IP protocol 50
B.IP protocol 51
C.TCP port 50
D.TCP port 51
E.UDP port 50
F.UDP port 51