單項選擇題which command is used to enable CHAP authentication whit PAP as the fallback method on a serialinterface？（）

A.（config-if）#authentication ppp chap fallback ppp
B.（config-if）#authentication ppp chap pap
C.（config-if）#ppp authentication  chap pap
D.（config-if）#ppp authentication  chap fallback ppp


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1.多項選擇題下列哪些屬于安全組織（）

A.SANS
B.Cisco
C.CERT
D.ISC

2.單項選擇題R1 forwards a packet from Host 1 to remote Server 1. Which statement describes the use of a MAC as the frame carrying this packet leaves the s0/0/0 interface of R1（）。

A.The frame does not have MAC addresses.
B.The source MAC address in the frame is the MAC address of the NIC of Host 1.
C.The source MAC address in the frame is the MAC address of the s0/0/0 interface of R1.
D.The destination MAC address in the frame is the MAC address of the NICof server 1.
E.The destination MAC address in the frame is the MAC address of the s0/0/0 interface of R2

3.單項選擇題What is known as "one-to-nearest" addressing in IPv6?（）

A.global unicast
B.anycast
C.multicast
D.unspecified address

4.單項選擇題Which type of cable is used to connect the COM port of a host to the COM port of a router or switch?（）

A.crossover
B.straight-through
C.rolled
D.shielded twisted-pair

5.單項選擇題最早的網(wǎng)絡(luò)安全工具是（）

A.ACS
B.IPS
C.IDS
D.IPSec