單項選擇題What is used as label in cell-based MPLS ？（）

A.VPI
B.VCI
C.VPI and VCI
D.Specific 4 bytes label
E.None of above


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1.單項選擇題Which of the following IOS commands can detect whether the SQL slammer virus propagates in yournetworks？（）

A.access-list 100 permit any any udp eq 1434
B.access-list 100 permit any any udp eq 1434 log
C.access-list 110 permit any any udp eq 69
D.access-list 110 permit any any udp eq 69 log
E.None of above.

2.單項選擇題What statement is true？（）

A.Link Control Protocol（LCP） is used for basic PPP link setup and operation
B.Link Control Protocol（LCP） is used for denying PPP connections to unauthorized devices.
C.Link Control Protocol（LCP） for PPP is synonymous to ARP for Ethernet.
D.None of the above

4.單項選擇題In which state can BGP peers exchange Update messages？（）

A.Active
B.OpenSent
C.OpenConfirm
D.Established
E.Idle

5.單項選擇題In PIM-SM operations， the first router connected to the multicast source sends the Register message towhich device？（）

A.Multicast source
B.Multicast receiver
C.RP
D.RP mapping agent
E.Designated Router （DR）

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