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單項選擇題Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

A.Frame Relay
B.HDLC
C.x.25
D.PPP

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1.單項選擇題What is the default administrative distance of OSPF？（）

A.120
B.100
C.90
D.110

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2.單項選擇題A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782.The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table？（）

A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes

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3.單項選擇題Which command sets and automatically encrypts the privileged enable mode password?（）

A.enbale password c1sco
B.secret enable c1sco
C.password enable c1sco
D.enable secret c1sco

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4.單項選擇題Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaionaddress？（）

A.FF02：：A
B.FF05：：101
C.FF02：：9
D.FF02：：6

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5.單項選擇題Which statement is true?（）

A.An IPv6 address is 64 b long and is represented as hexadecimal characters.
B.An IPv6 address is 32 b long and is represented as decimal digits.
C.An IPv6 address is 128 b long and is represented as decimal digits.
D.An IPv6 address is 128 b long and is represented as hexadecimal characters.

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