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【简答题】
命题“若a＞b，则2 a ＞2 b -1”的否命题为（ ）。
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举一反三
【单选题】How does using the service password encryption command on a router provide additional security?（）
A.
by encrypting all passwords passing through the router
B.
by encrypting passwords in the plain text configuration file
C.
by requiring entry of encrypted passwords for access to the device
D.
by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E.
by automatically suggesting encrypted passwords for use in configuring the router
【简答题】方程ax 2 +bx=0（a≠0）的根是x 1 =0，x 2 =______．
【单选题】When configuring a Cisco Adaptive Security Appliance in multiple context mode， which of the follow capabilities are supported？（）
A.
Multicastis supported
B.
Dynamic routing protocols are supported
C.
VPN configurations are supported
D.
Static routes are supported
【单选题】One of the most important characteristics of OSPF is Multiple areas. Which statement best describes why this feature is such an important enhancement to earlier routing protocols?（）
A.
The network domain, when divided into areas, allows for the use of both IANA classful addressing and private addressing.
B.
The use of multiple areas allows for the use of prioritization.
C.
All computation is kept within the area, with minimum communication between the areas,allowing the network to scale to larger sizes.
D.
It is easier to implement security.
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