【单选题】
按逻辑功能的不同，双稳态触发器可分为___。
A. RS、JK、D、T等
B. 主从型和维持阻塞型
C. TTL型和MOS型
D. 上述均包括
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答案
A
解析
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某电视机水平-垂直扫描发生器需要一个分频器将31500HZ的脉冲转换为60HZ的脉冲，欲构成此分频器至少需要___个触发器。
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【单选题】
24在8×51的程序里，若要将某个输入/输出端口设置成输入功能，应如何处理？___
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B. 先输出低电平到该输入/输出端口
C. 先读取该输入/输出端口的状态
D. 先保存该输入/输出端口的状态
【单选题】
29在Keil µVision3里进行调试/仿真时，在哪里操作才能触动程序中断？___
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What is the main purpose of Control Plane Policing？___
A. to prevent exhaustion of route-proce ssor resources
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C. to define traffic classes
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【单选题】
Which attack can be prevented by OSPF authentication？___
A. smurf attack
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C. denial of service attack
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【单选题】
What is the best definition of hairpinning？___
A. ingress traffic that traverses the outbound interface on a device
B. traffic that enters one interface on a device and that exits through another interface
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Which SNMPv3 security level provides authentication using HMAC with MD5， but does not use encryption？___
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You have implemented a dynamic blacklist， using security intelligence to block illicit network activity. However， the blacklist contains several approved connections that users must access for usiness pur poses. Which action can you take to retain the blacklist while allowing users to access the approve d sites？___
A. Create a whitelist and manually add the approved addresses.
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【单选题】
When connecting to an external resource,you must change a source IP address to use one IP address from a range of 207.165.201.1 to 207.165.1.30. Which option do you implement ?___
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Refer to the exhibit. 【nat（ins，any）dynamic interface】Which ty pe of NaT is configured on a Cisco ASA？___
A. dynamic NAT
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【单选题】
Which mitigation technology for web-based threats prevents the removal of confidential data from the network？___
A. CTA
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D. DLP
【单选题】
Refer to the exhibit. What is the effect of the given configuration？___
A. It establishes the preshared key for the switch
B. It establishes the preshared key for the firewall.
C. It establishes the preshared key for the Cisco ISE appliance
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【多选题】
What are two major considerations when choosing between a SPAN and a TAP when plementing IPS？___
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【多选题】
What are two direct-to-tower methods for redirecting web traffic to Cisco Cloud Web Security？___
A. third-party proxies
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【多选题】
Which three descriptions of RADIUS are true？ ___
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【多选题】
Which two configurations can prevent VLAN hopping attack from attackers at VLAN 10？___
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【多选题】
What are two features of transparent firewall mode ___
A. It conceals the presence of the firewall from attackers
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【多选题】
Which two models of A sa tend to be used in a data center？___
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Which two statements about hardware-based encrption are true？___
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【多选题】
In which two modes can the Cisco We b Security appliance be de ployed？___
A. as a transparent proxy using the Secure Sockets Layer protocol
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D. as a transparent proxy using the Hyper Text Transfer Protocol
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