【单选题】
电气化区段4信息移频自动闭塞，交流电源为正弦波，其电压波动范围不大于_______时应可靠工作。[311010101]___
A. 180V±20V
B. 200V±22V
C. 220V±22V
D. 240V±24V
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相关试题
【单选题】
电气化区段4信息移频自动闭塞,衰耗隔离电子盒的主要技术指标输入阻抗为_______。[331010103]___
A. 1.8kΩ～2.2kΩ
B. 2.3kΩ～2.5kΩ
C. 3.0kΩ～3.3kΩ
D. 4.0kΩ～4.5kΩ
【单选题】
电气化区段4信息移频自动闭塞, 衰耗隔离电子盒的主要技术指标引线端子对机壳绝缘_______。[311010103]___
A. 小于25MΩ
B. 大于25MΩ
C. 大于30MΩ 小于30MΩ
【单选题】
ZP.Y2-18型移频自动闭塞轨道电路在分路状态下、道碴电阻最大时、用0.06Ω标准分路电阻分路任一地点，均应使分路残压在接收盘滤入处小于或等于_______。[333050203]___
A. 90mV
B. 100mV
C. 110mV
D. 120mV
【单选题】
ZP.Y2-18型移频自动闭塞轨道电路在晴天做分路试验，用0.06Ω电阻线分路时，在接收盘的“接入”孔上测试，一般电压为几十毫伏，最大不应超过_______。[333050203]___
A. 90mV
B. 100mV
C. 110mV
D. 120mV
【单选题】
ZP.Y2-18型移频自动闭塞区间电源屏应提供48V±1V的稳定电压，杂音电压应小于_______。[321010104]___
A. 90mV
B. 95mV
C. 100mV
D. 120mV
【单选题】
移频发送盒分频器采用了四级分频，经四级分频器后输出信号的频率仅为输入信号频率的_______。[311010104]___
A. 1/2
B. 1/4
C. 1/8
D. 1/16
【单选题】
移频电源盒的稳压电源，杂音电压不大于_______。[321010104]___
A. 100mV
B. 150mV
C. 200mV
D. 300mV
【单选题】
UM71型无绝缘轨道电路自动闭塞，电源电压范围在直流_______时应可靠工作。[311010102]___
A. 24V
B. 28V
C. 30V
D. 38V
【单选题】
UM71型无绝缘轨道电路自动闭塞,SVA空芯线圈的电阻量应为_______。[331010103]___
A. 18.5mΩ±5.5mΩ
B. 20.5mΩ±7.5mΩ
C. 25.5mΩ±8.5mΩ
D. 30.0mΩ±9.5mΩ
【单选题】
ZPW-2000A型无绝缘移频轨道电路自动闭塞，室内各种配线应采用_______。[311030203]___
A. 阻燃线
B. 通信电缆
C. 信号电缆
D. 阻燃屏蔽线
【单选题】
ZPW-2000A型无绝缘移频轨道电路自动闭塞，室内电线、电缆布线禁止出现_______。[311030203]___
A. 一字状
B. 环状
C. 十字状
D. 交叉状
【单选题】
ZPW-2000A型无绝缘移频轨道电路自动闭塞，各种配线_______。[313030203]___
A. 不得有中间接头可以有绝缘破损现象
B. 不得有绝缘破损现象可以有中间接头
C. 不得有中间接头和绝缘破损现象
D. 可以有中间接头和绝缘破损现象
【单选题】
ZPW-2000A型无绝缘移频轨道电路自动闭塞，室内各种配线、与数据通信线共槽的线缆均应采用_______。[311030203]___
A. 阻燃线
B. 通信电缆
C. 信号电缆
D. 阻燃屏蔽线
【单选题】
ZPW-2000R型无绝缘移频轨道电路自动闭塞，电源电压在_______的范围内应可靠工作。[311010101]___
A. 40V±1V
B. 48V±1V
C. 53V±1V
D. 55V±2V
【单选题】
ZPW-2000R型无绝缘移频轨道电路自动闭塞，信号机械室内部的各种配线全部采用_______。[311030203]___
A. 阻燃线
B. 通信电缆
C. 信号电缆
D. 阻燃屏蔽线
【单选题】
ZPW-2000R型无绝缘移频轨道电路自动闭塞，信号机械室内部的各种配线，与数据通信线共槽的线缆均应采用_______。[311030203]___
A. 阻燃线
B. 通信电缆
C. 信号电缆
D. 阻燃屏蔽线
【单选题】
非电气化区段微机交流计数电码自动闭塞设备与电气化区段设备相比,无_______。[322010203]___
A. 分频器
B. 滤波器
C. 干扰抑制器
D. 分频器,滤波器,干扰抑制器
【单选题】
电气化区段微机交流计数电码自动闭塞设备,在交流电源为正弦波,电压波动范围在_______下应可靠工作。[331010101]___
A. 不大于220V±33V
B. 不小于220V±33V
C. 不大于240V±40V
D. 不小于240V±40V
【单选题】
电气化区段微机交流计数电码自动闭塞设备,在交流电源为正弦波,频率范围在_______下应可靠工作。[331010101]___
A. 50Hz±1Hz
B. 70Hz±1Hz
C. 75Hz±1Hz
D. 85Hz±1Hz
【单选题】
电气化区段微机交流计数电码自动闭塞设备,不平衡电流_______。[322010101]___
A. 不大于25A
B. 不小于25A
C. 不大于50A
D. 不小于50A
【单选题】
电气化区段微机交流计数电码自动闭塞设备,发码器U3的6脚应为2kHz±0.5kHz方波,幅值_______。[311010103]___
A. 不大于4V
B. 不小于4V
C. 不大于8V
D. 不小于8V
【单选题】
ZPW-2000A型无绝缘移频自动闭塞在收到11.4Hz电码后，控制信号机点_______灯。[311010201]___
【单选题】
ZPW-2000A无绝缘移频自动闭塞系统发送器共采用_______CPU同时工作。[321010103]___
【单选题】
非电气化区段4信息移频轨道电路用0.06Ω标准分路电阻线在轨道电路不利处所分路时，接收设备的限入残压不大于_______。[333010101]___
A. 0.1V
B. 0.5V
C. 5V
D. 6.2V
【单选题】
ZPW-2000A无绝缘移频自动闭塞系统主轨道调谐区分路死区不大于_______。[311010103]___
【单选题】
ZPW-2000A型轨道电路的发送器负载为400Ω时，其输出功率_______。[321010103]___
A. 120W
B. 100W
C. 90W
D. 70W
【单选题】
ZPW-2000A型轨道电路的发送器低频频偏为_______。[331010103]___
A. ±7Hz
B. ±9Hz
C. ±11Hz
D. ±13Hz
【单选题】
ZPW-2000A无绝缘移频自动闭塞系统补偿电容引接线与钢轨要可靠连接，塞钉与钢轨间电压降应小于_______。[311010101]___
A. 5mV
B. 9mV
C. 15mV
D. 20mV
【单选题】
ZPW-2000A设备系统防雷室外防雷地线电阻要严格控制在_______以内。[323010103]___
A. 10Ω
B. 15Ω
C. 20Ω
D. 25Ω
【单选题】
ZPW-2000A无绝缘轨道电路，当长度超过_______时，主轨道需要加装补偿电容进行补偿。[323010103]___
A. 200m
B. 300m
C. 400m
D. 500m
【单选题】
ZPW-2000A无绝缘轨道电路分路状态在最不利条件下，主轨道任意一点采用0.15Ω标准分路线分路时,“轨出1”分路电压应不大于_______,轨道继电器可靠落下，在调谐区内分路时轨道电路存在死区段。[323010101]___
A. 110mV
B. 120mV
C. 130mV
D. 140mV
【单选题】
ZPW-2000A无绝缘轨道电路应能实现全程断轨检查，主轨道断轨时,“轨出1”电压不大于_______,轨道继电器可靠落下。[322010101]___
A. 110mV
B. 120mV
C. 130mV
D. 140mV
【单选题】
ZPW-2000A无绝缘轨道电路应能实现全程断轨检查，小轨道断轨时, “轨出2”电压不大于_______,轨道继电器可靠落下。[323010101]___
A. 43mV
B. 53mV
C. 63mV
D. 73mV
【单选题】
ZPW-2000A无绝缘轨道电路分路状态在最不利条件下,在1700Hz轨道电路区段任意一处用0.15Ω标准分路线分路,短路电流不小于_______。[322010101]___
A. 400mA
B. 500mA
C. 600mA
D. 700mA
【单选题】
ZPW-2000A无绝缘轨道电路分路状态在最不利条件下,在2000Hz轨道电路区段任意一处用0.15Ω标准分路线分路,短路电流不小于_______。[322010101]___
A. 400mA
B. 500mA
C. 600mA
D. 700mA
【单选题】
ZPW-2000A无绝缘轨道电路分路状态在最不利条件下,在2300Hz轨道电路区段任意一处用0.15Ω标准分路线分路,短路电流不小于_______。[322010101]___
A. 400mA
B. 500mA
C. 600mA
D. 700mA
【单选题】
ZPW-2000A无绝缘轨道电路分路状态在最不利条件下,在2600Hz轨道电路区段任意一处用0.15Ω标准分路线分路,短路电流不小于_______。[322010101]___
A. 450mA
B. 550mA
C. 650mA
D. 700mA
【单选题】
ZPW-2000A无绝缘轨道电路防护盒边缘距钢轨内侧不得小于_______。[312030205]___
A. 1300mm
B. 1400mm
C. 1500mm
D. 1600mm
【单选题】
ZPW-2000A无绝缘轨道电路补偿电容参数在1700Hz区段的指标及范围是_______。[322010103]___
A. 40uF±2.0uF
B. 46uF±2.3uF
C. 50uF±2.5uF
D. 55uF±2.75uF
【单选题】
ZPW-2000A无绝缘轨道电路补偿电容参数在2000Hz区段的指标及范围是_______。[322010103]___
A. 40uF±2.0uF
B. 46uF±2.3uF
C. 50uF±2.5uF
D. 55uF±2.75uF
推荐试题
【多选题】
.Which three statements de scribe DHCP spoofing attacks？___
A. They can modify traffic in transit.
B. They are used to perform man- in-the-middle attacks
C. They use ARP poisoning
D. They can access most network devices
E. They protect the ide ntity of the attacker by masking the DHCP address.
F. They are can physically modify the network gateway.
【多选题】
Which statement about the communication between interfaces on the same security level is true？___
A. Interfaces on the same security level require additional configuration to permit interinterface communication
B. Configuring interfaces on the same security level can cause asymmetric routing
C. All traffic is allowed by default between interfaces on the same security level
D. You can configure only one interface on a n individual security level
【多选题】
In which two situations should you use in band management？ ___
A. when the control plane fails to respond
B. when you require administrator access from multiple locations
C. when you require ROMMON access.
D. where a network device fails to forward packets
E. when multiple ma nagement applications need concument access to the device.
【多选题】
Which two features are supported in a VRF-aware softwar infrastructure before VRF-lite?___
A. multicast
B. fair queuing
C. WCCP
D.
E. IGRP
【多选题】
.Which loS command do you enter to test authentication again a AAA server？___
A. dialer aaa suffix <suffix> password <password>
B. ppp authentication chap pap test
C. test aaa-server authentication dialer group user name <user> password <password>
D. aaa authentication enable default test group tacases
【多选题】
Which two statements about the self zone on a cisco Xone based policy firewall are true？___
A. Multiple interfaces can be assigned to the self zone
B. it supports stateful inspections for multicast traffic
C. zone pairs that include the self zone apply to traffic transiting the device.
D. it can be either the source zone or the destination zone
E. traffic entering the self zone must match a rule
【多选题】
Which type of attack can exploit design flaws in the implementation of an application without ？___
A. DHCP starvation attacks
B. low-rate dos attacks
C. application DDos flood attacks
D. application DDoS flood attacks
E. volume-based DDoS attacks
【单选题】
Which type of firewall can server as the interme diary between a client and a server ?___
A. Stateless firewall
B. application firewall
C. proxy firewall
D. personal firewall
【单选题】
What is the highest security level that can be configured for an interface on an ASA？___
【单选题】
Which term refers to the electromagnetic interference that can radiate from network cables？___
A. Gaussian distributions
B. Doppler waves
C. emanations
D. multimode distortion
【单选题】
How does a zone pair handle traffic if the policy de fination of the zone pair is missing?___
A. It inspects all traffic.
B. It drops all traffic.
C. It permits all traffic wihtout logging
D. It permits and logs all traffic
【单选题】
default how does a zone based firewall handle traffic to add from the self zone？___
A. It permits all traffic without inspection
B. It inspects all traffic to determine how it is handled
C. It permits all traffic after inspection
D. It frops all traffic
【单选题】
Which command should beused to ena ble AAA Authentication to determine if a user can access the privilege command level？___
A. aaa authentication enable local
B. aaa authentication enable level=
C. aaa authentication enable method de fault
D. aaa authentication enable defa ult local
【单选题】
On an ASA， the policy indicates that traffic should not be translated is often referred to as which of the following？___
A. NAT zero
B. NAT forward
C. NAT nul
D. NAT allow
【单选题】
Which protocol offers data Integrity encryption， authentication， and anti-replay functions for IPSec VPN？___
A. ESP protocol
B. IKEv3 Protocol
C. AH protoco
D. IKEv1 Protocol
【单选题】
Which component offers a variety of security Solution， including firwall， IF Antivirus and antiphishing features？___
A. Cisco loS router
B. Cisco ASA 5500 Ser ies security appliance
C. Cisco ASA 5500 X series Next Gen Security appliance
D. Cisco 4200 series IPS appliance
【单选题】
Refer to the exhibit， A Network Secur ity administrator check the ASa firewall NAT policy table rith show nat command， which statement is fails？___
A. There are only reverse translation matches for the REAL SERvER object
B. First policy in the Section 1 is a dynamic nat entry defined in the object configuration
C. NAT policy in section 2 is static entry de fined in the object configuration
D. Translation in Section 3 used when a connection does not matches any entries in first two sections
【单选题】
What is true of an aSa in transparent mode ?___
A. It supports OSPF
B. It requires an IP address for each interface
C. It requires a management IP address
D. It allows the use of dynamic NaT
【单选题】
What is the effect of the ip scp server enable command？___
A. It references an access list that allows specific SCP servers
B. It allows the router to initiate requests to an SCP server
C. It allows the router to become an SCP server
D. It adds SCP to the list of allowed copy functions
【单选题】
How can you mitigate attacks in which the attacker attaches more than one vLan tag to a packet？___
A. Assign an access VLAN to every active port on the switch
B. Disable Ether Channel on the switch
C. Explicitly identity each VLAN allowed across the trunk
D.
E. nable transparent VTP on the switch
【单选题】
Which technology can you implement to centrally mitigate potential threats when users on your network download files that might be malicious？___
A. Enable file-reputation services to inspect all files that traverse the company network and block files with low reputation scores
B. Verify that the compa ny IpS blocks all known malicious website
C. Verity that antivirus software is installed and up to date for all users on your network
D. Implement URL filtering on the perimeter firewall
【单选题】
What is the most common implementation of PaT in a standard networked environment？___
A. configuring multiple external hosts to join the self zo ne and to communicate with one another
B. configuring multiple internal hosts to communicate outside of the network using the outside interface IP address
C. configuring multiple internal hosts to communicate outside of the network by using the inside interface IP address
D. configuring an any any rule to enable external hosts to communicate inside the network
【单选题】
Which component of a bYod architecture provides aAa services for endpoint access ?___
A. Integrated Services Router
B. access point
C. ASA
D. Identity Services
E. ngine
【单选题】
You are configuring a NAT rule on a Cisco ASA ,Which description of a mapped interface is true?___
A. It is mandatory for all firewall modes
B. It is optional in routed mode
C. It is optional in transparent mode
D. It is mandatory for ide ntity NAT only
【单选题】
Which description of the use of a private key is true ？___
A. The sender signs a message using the receivers private key
B. The sender signs a message using their private key
C. The sender encrypts a message using the receivers private key
D. The receiver decrypts a n15ssage using the sender's private key
【单选题】
Which mechanism does the FireAMP Connector use to avoid conflicts with other security applications such as antivirus products ?___
A. Virtualization
B. Containers
C. Sandboxing
D.
E. xclusions
【单选题】
Which network to pology de scribes multiple LANS in a gec? ___
A. SOHO
B. MAN
C. pan
D. CAN
【单选题】
Which statement represents a difference between an access list on an aSa versus an access list on a router？___
A. The asa does not support number access lists
B. The aSa does not support standard access list
C. The asa does not ever use a wildcard mask
D. The asa does not support extended access lists
【单选题】
Which command do you enter to verify the status and settings of an iKE Phase 1 tunnel？___
A. show crypto ipsec as output
B. show crypto isakmp
C. show crypto isakmp policy
D. show crypto ipsec transform
【单选题】
Which feature can help a router or switch maintain packet forwarding and protocol states despite an attack or heavy traffic load on the router or switch？___
A. service Policy
B. Control Plane Policing
C. Policy Map
D. Cisco
E. xpress
F. orwarding
【单选题】
Which STP feature can prevent an attacker from becoming the root bridge by immediately shutting down the interface when it receives a BPDU？___
A. root guard
B. Port Fast
C. BPDU guard
D. BPDU filtering
【单选题】
Which technology can best protect data at rest on a user system？___
A. full-disk encryption
B. IPsec tunnel
C. router ACL
D. network IPS
【多选题】
Which two primary security concerns can you mitigate with a BYOD solution ？___
A. schedule for patching the device
B. securing access to a trusted corporate network
C. compliance with applicable policies
D. connections to public Wi-Fi networks
E. device tagging and invento
【多选题】
choose five___
A. MD5————————inserure
B. DES————————insercure
C. SDES———————legacy
D. SHA-1———————legacy
E. HMAC-MD5—————legacy
【多选题】
Which two characteristics of symmetric encryption are true？___
A. It uses digital certificates
B. It requires more resources than asymmetric ancryption
C. It uses the same key to enctypt and decrupt traffic
D. It uses a public key and a pricate key to encrypt and decrypt traffic.
E. It is faster than asymmetric encryption
【多选题】
which two characteristics of PVLAN are true？___
A. Promiscuous porta can communicate with PVLAN ports.
B. Isolated ports cannot communicate with other ports on the same VLAN
C. Community ports have to be a part of the trunk.
D. They require VTP to be enabled in server mode
E. PVLAN ports can be configured as Ether Channel ports
【多选题】
What are two options for running Cisco SDM?___
A. Running SDM from a mobile device
B. Running SDM from within CiscoWorks
C. Running SDM from a router's flash
D. Running SDM from the Cisco web porta
E. Running SDM from a PC
【多选题】
Which two options are the primary deployment modeles for mobile device management？___
A. multisite
B. cloud-based
C. on premises
D. hybrid cloud basedo
E. single site
【多选题】
Drag the recommendation on the left to the Cryptographic algorithms on the right， Options will be used more than once.___
A. Avoid——————————————DES，MD5
B. Legacy——————————————SDES，SHA1，HMAC-MD5
【多选题】
Which two are valid types of vLans using PVLANS ?___
A. Community VLAN
B. Backup VLAN
C. Secondary VLAN
D. Isolated VLAN
E. Isolated VLAN
