單項選擇題Which command can be a router to verify the layer 3 path to a host?()

A.traceroute address
B.tracert address
C.ssh address
D.telnet address


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3.多項選擇題What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) ()。

A.VLAN support
B.compression
C.authentication
D.sliding windows
E.multilink support
F.quality of service

5.單項選擇題What is the effect of using the service password-encryption command?()

A.Only passwords configured after the command has been entered will beencrypted.
B.Only the enable password will be encrypted.
C.Only the enable secret password will beencrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration.
E.It will encrypt all current and future passwords.