【单选题】
在无任何道岔动作时，电动转辙机电源对地电流不得大于___。
A. 0.5mA
B. 1mA
C. 1.5mA
D. 2mA
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答案
B
解析
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有两轨道电路区段：1Ω电阻使其中一个区段轨道继电器落下的轨道电路比0.1Ω电阻使轨道另一区段轨道继电器落下的轨道电路灵敏度___。
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并机系统在两台UPS 上电前，需检查两台UPS 的输入、输出三相的相位要一一对应，可用万用表测试两台UPS 输入A 相间电压、B 相间电压、C 相间电压应小于___。
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在电源系统中 Vmax smart系UPS面板FAULT灯亮，蜂鸣器长鸣，原因不可能是___。
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What are two reasons to recommend SNMPv 3 over SNMPv2？___
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Which command successfully creates an administrative user with a password of "cisco"on a Cisco router?___
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How does the 802. 1x supplicant communicate with the authentication server？___
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Refer to the exhibit. what is the e ffect of the given configuration？___
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Which command can you enter to configure OSPF to use hashing to authenticate routing updates？___
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Which command can you enter to verify the status of Cisco lOS Resilient Configuration on a Cisco router?___
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Which statement about NaT table evaluation in the asa is true？___
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Which information can you display by executing the show crypto ipsec sa command？___
A. ISAKMP SAs that are established between two peers
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How can you prevent NAT rules from sending traffic to incorrect interfaces？___
A. Assign the output interface in the NAT statement
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【单选题】
What term can be defined as the securing， control， and identification of digital data？___
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Which feature in the dNS security module provide on and off network DNS protection？___
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C.
D. ouble tagging can cause the switches to experience CAM table overload.
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What configuration is required for multitenancy ?___
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Why does ISE require its own certificate issued by a trusted CA？___
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【单选题】
which attack involves large numbers of ICMP packets with a spoofed source IP address？___
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【单选题】
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【单选题】
Which type of malicious software can create a back-door into a device or network？___
A. bot
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D. Trojan
【单选题】
Which security term refers to the like lihood that a weakness will be exploited to cause damage to an asset？___
A. threat
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【单选题】
Which IPS detection method examines network traffic for preconfigured patterns？___
A. signature-based detection
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【单选题】
What is an advantage of split tunneling ？___
A. It allows users with a VpN connection to a corporate network to access the internet with sending traffic across the cor porate network.
B. It allows users with a vpn connection to a corporate network to access the internet by using the vPN for security.
C. It protects traffic on the private network from users on the public network
D. It enables the VPN server to filter traffic more efficiently
【单选题】
Which IDS/IPS state misidentifies acceptable behavior as an attack ？___
A. false negative
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【单选题】
What is the maximum num ber of methods that a single method list can contain？___
A. 4
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【单选题】
Which command enables authentication at the oSPFv2 routing process level？___
A. ip ospf authentication message-digest
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C. ip ospf message-digest-key 1 mds Cisco
D. area 0 authentication ipsec spi 500 md5 1234567890ABCDEF1234567890ABCDEF
【单选题】
Which type of firewall monitors a nd protects a specific system？___
A. firewall
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【单选题】
On an ASA， which maps are used to identify traffic？___
A. Route maps
B. Policy maps
C. Class maps
D. Service maps
【单选题】
Which type of social engineering attack targets top executives？___
A. whaling
B. vishin
C. spear phishing ng
D. baiting
【单选题】
What is the minimum Cisco lOS version that supports zone-based firewalls？___
A. 12.1T
B. 15.1
C. 15.0
D. 124
【单选题】
In which type of attack does an attacker overwrite an entry in the CAM table to divert traffic destined to a legitimate host？___
A. DHCP spoofing
B. ARP spoofing
C. CAM table overflow
D. MAC spoofing
【多选题】
Which two attack types can be prevented with the impleme ntation of a Cisco IPS solution？___
A. DDos
B. man-in-the-middle
C. worms
D. ARP spoofing
E. VLAN hopping
【多选题】
choose four___
A. DHCP snooping ——————————blocks DHCP messages
B. Dynamic ARP inspection——————verifies IP-to-MAC traffic on untrusted ports
C. IP sources guard ——————————provides layer 2 interface security with ports ACLs
D. Port security————————————mitigates MAC-address spoofing at the access interface
