單項(xiàng)選擇題What bit should be set in the link state PDUs in an IS-IS level-1-2 router to indicate that they are a potentialexit point out of the area ?()

A.ATT(Attached)bit
B.IS-Type bits
C.P(Partition)bit
D.Down bit
E.PN(Pseudonode)biy
F.ABR(Area Border Rorter)bit


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1.單項(xiàng)選擇題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.

2.多項(xiàng)選擇題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.

4.單項(xiàng)選擇題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

5.多項(xiàng)選擇題In PPPoA architecture, which two methods are most commonly deployed?()

A.terminating PPP sessions at the service provider
B.PPP framing
C.PPP multiplexing
D.GRE tunneling
E.L2TP tunneling

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