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單項(xiàng)選擇題

While troubleshooting a serial line problem, you enable ppp authentication debugging as shown below:

Based on the command output above, what type of 'handshake' was used for PPP authentication?（）

A. one-way
B. two-way
C. three-way
D. four-way
E. no handshakes required during authentication
F. None of the above

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單項(xiàng)選擇題

After attempting to telnet into a router, you are denied and you receive the error message "password required, but none set." What configuration changes will allow telnet access into this router?（）

A.
B.
C.
D.

單項(xiàng)選擇題

Which wild card mask will enable a network administrator to permit access to the Internet for only hosts that are assigned an address in the range 192.168.8.0 through 192.168.15.255?（）

A. 0.0.0.0
B. 0.0.0.255
C. 0.0.255.255
D. 0.0.7.255
E. 0.0.3.255
F. None of the above