【多选题】
What are two ways to prevent eavesdropping when you perform device management tasks？___
A. Use an SSH connection.
B. Use SNMPv3
C. Use out-of-band management
D. Use SNMP
E. Use in-band management
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相关试题
【多选题】
Which two features are commonly used CoPP and CPPr to protect the control plane？ ___
A. QoS
B. traffic classification
C. access lists
D. policy maps
E. class maps
F. Cisco Express Forwarding
【多选题】
Which four tunne ling prot ocols are enabled in the Dfit GrpPolicy group policy ？___
A. Clientless SSL VPN
B. SSL VPN Client
C. PPTP
D. L2TP/IPsec
E. IPsec IKEv1
F. IPsec IKEv2
【多选题】
Which two statements regarding the aSA VPN configurations are correct？___
A. The asa has a certificate issued by an external certificate authority associated to the ASDM TrustPoint1
B. The Default WEBVPNGroup Connection Profile is using the aaa with RADIUS server method
C. The Inside-srvbook mark references the https://192.168.1.2url
D. Only Clientless SSL VPN access is allowed with the Sales group policy
E. Any Connect， IPSec IKEv1， and IPSec IKEv2 VPN access is enabled on the outside interface
F. The Inside -SRV bookmark has not been applied to the Sales group policy
【多选题】
Which three ESP fields can be encrypted during transmission？___
A. Security Parameter Index
B. Sequence Number
C. MAC Address
D. Padding
E. Pad length
F. Next Header
【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
推荐试题
【单选题】
如果两个经变量 与 间的关系近似地表现为，当 发生一个绝对量变动 时， 有一个固定的相对量 变动，则适宜配合的模型是___
【单选题】
模型 中， 的实际含义是___
A. 关于 的弹性
B. 关于 的弹性
C. 关于 的边际倾向
D. 关于 的边际倾向
【单选题】
在多元线性回归中，判定系数R2随着解释变量数目的增加而___
A. 减少
B. 增加
C. 不变
D. 变化不定
【单选题】
对两个包含的解释变量个数不同的回归模型进行拟合优度比较时，应比较它们的：___
A. 判定系数
B. 调整后判定系数
C. 标准误差
D. 估计标准误差
【单选题】
已知某一直线回归方程的判定系数为0.64，则解释变量与被解释变量的线性相关系数为___
A. 0.64
B. 0.8
C. 0.4
D. 0.32
【单选题】
对两个随机变量Y与X之间样本相关系数r，以下结论中错误的是___
A. 越接近于1，Y与X之间线性相关程度可能越高，样本容量越大，可能性越大。
B. 越接近于0，Y与X之间线性相关程度可能越弱，样本容量越大，可能性越大。
C. -1≤r≤1
D. 若r=0,则X与Y独立（没有直线关系）
【单选题】
已知对符合古典假定的、含有截距项的三元线性回归模型，用OLS估计的残差平方和为800，估计用的样本容量为24，则随机误差项的方差的无偏估计量的观察值为___。
A. 33.33
B. 40
C. 38.09
D. 36.36
【单选题】
t检验是根据t分布理论所作的假设检验，下列哪项可作t检验?___
A. 单个回归系数的显著性检验
B. 线性关系的总体显著性检验
C. 一阶线性自相关的显著性检验
D. 多个预测值与实际值之间差异的显著性检验
【单选题】
又已知t_0.025 (8)=2.306 (即对自由度为8的t分布，有P(t>2.306)=0.025) ,t_0.025 (10)=2.228 ,t_0.05 (8)=1.860 ,t_0.05 (10)=1.812，则在0.05的显著性水平下 ___
A. 截距显著为0，斜率显著为0
B. 截距显著为0，斜率显著不为0
C. 截距显著不为0，斜率显著为0
D. 截距显著不为0，斜率显著不为0
【单选题】
某一特定的 水平上，总体 分布的离散度越大，即 越大，则在置信度相同时___
A. 预测区间越宽，精度越低
B. 预测区间越宽，预测误差越小
C. 预测区间越窄，精度越高 C、预测区间越窄，预测误差越大
【单选题】
在线性回归模型中，若解释变量X_1,X_2的观测值成比例，则表明___
A. 数据矩阵X存在完全多重共线性
B. 数据矩阵X存在不完全多重共线性
C. 数据矩阵X不存在多重共线性
D. 解释变量X_1,X_2存在完全多重共线性
【单选题】
在线性回归模型中，若〖(X^' X)〗^(-1)存在，但不是对角阵，则表明___
A. 数据矩阵X存在完全多重共线性
B. 数据矩阵X存在不完全多重共线性
C. 数据矩阵X不存在多重共线性
D. 解释变量存在不完全多重共线性
【单选题】
在线性回归模型中，若〖(X^' X)〗^(-1)是对角阵，则表明___
A. 数据矩阵X存在完全多重共线性
B. 数据矩阵X存在不完全多重共线性
C. 数据矩阵X不存在多重共线性
D. 解释变量不存在多重共线性
【单选题】
在有截距项的三元线性回归模型中，若辅助回归X_i3=α_0+α_1 X_i1+α_2 X_i2+v_i ,i=1,2,⋯,n，且其中常数α_0,α_1,α_2不全为0，v_i全为0，则表明___
A. 数据矩阵X的第四列与前三列存在完全多重共线性
B. 数据矩阵X的第四列与前三列存在不完全多重共线性
C. 数据矩阵X的第四列与前三列不存在多重共线性
D. 解释变量X_1,X_2,X_3之间存在完全多重共线性
【单选题】
在有截距项的三元线性回归模型中，若辅助回归X_i3=α_0+α_1 X_i1+α_2 X_i2+v_i ,i=1,2,⋯,n，且其中常数α_0,α_1,α_2不全为0，v_i不全为0，则表明___
A. 数据矩阵X的第四列与前三列存在完全多重共线性
B. 数据矩阵X的第四列与前三列存在不完全多重共线性
C. 数据矩阵X的第四列与前三列不存在多重共线性
D. 解释变量X_1,X_2,X_3之间存在不完全多重共线性
【单选题】
在有截距项的三元线性回归模型中，若辅助回归X_i3=α_0+α_1 X_i1+α_2 X_i2+v_i ,i=1,2,⋯,n，且其中常数α_0,α_1,α_2全为0，则表明___
A. 数据矩阵X的第四列与前三列存在完全多重共线性
B. 数据矩阵X的第四列与前三列存在不完全多重共线性
C. 数据矩阵X的第四列与前三列不存在多重共线性
D. 解释变量X_1,X_2,X_3之间存在完全多重共线性
【单选题】
则表明___
A. 数据矩阵X的第四列与前三列不存在严重不完全多重共线性
B. 数据矩阵X的第三列与其它三列存在严重不完全多重共线性
C. 数据矩阵X的第四列与前三列之间的不完全多重共线性比X的第三列与其它三列之间的不完全多重共线性更严重
D. 解释变量X_1,X_2,X_3之间存在不完全多重共线性
【单选题】
在有截距项的三元线性回归模型中，若辅助回归X_i3=α_0+α_1 X_i1+α_2 X_i2+v_i ,i=1,2,⋯,n，且其中常数α_0,α_1,α_2不全为0，v_i全为0，则表明___
A. 模型参数的OLS估计不存在
B. β_3 的OLS估计不存在
C. β_3 的OLS估计有无穷多
D. Var(β ̂_3)趋于无穷大
【单选题】
则___
A. β_3 的OLS估计不存在
B. Var(β ̂_3)一定很大
C. β_3的t检验一定显著为0
D. 在显著性水平0.05下，如果β_3的t检验显著不为0，则〖P(β〗_3=0)≤0.05
【单选题】
与前三列正交时，参数的OLS估计记为γ ̂_0，γ ̂_1，γ ̂_2，γ ̂_3，则___
A. β_3 的OLS估计不存在
B. Var(β ̂_3)一定很大
C. Var(β ̂_3 )=20Var(γ ̂_3 )
【单选题】
线性模型Yi=β0+β1X1i+β2X2i+μi不满足哪一假定称为异方差现象?___
A. Cov(μi,μj)=0
B. Var(μi)=σ2
C. Cov(Xi,μi)=0
D. Cov(X1i,X2i)=0
【单选题】
加权最小二乘法克服异方差的主要原理是通过赋予不同误差的观测点以不同的权数，以提高估计精度，即：___
A. 重视大误差的作用，轻视小误差的作用
B. 重视小误差的作用，轻视大误差的作用
C. 重视小误差的作用，更重视大误差的作用
D. 轻视大误差的作用，更轻视小误差的作用
【单选题】
异方差性条件下普通最小二乘估计量是___
A. 无偏估计量
B. 有偏估计量
C. 有效估计量
D. 最佳无偏估计量
【单选题】
如果戈德菲尔德—匡特检验显著，则认为什么问题是严重的___
A. 异方差问题
B. 异常值
C. 变量关系非线性
D. 规律性扰动
【单选题】
经验认为，某个解释变量与其它解释变量间多重共线性严重的情况是这个解释变量的 ___
A. 大于1
B. 小于1
C. 大于10
D. 小于5
【单选题】
如果戈里瑟检验表明，普通最小二乘估计结果的残差 与 显著有关系|e_i |=2x_i+v_i，其中（ 满足线性模型的全部经典假设），则用加权最小二乘法估计模型参数时，∑▒〖w_i e_i^2 〗中的权数w_i应取为___
【单选题】
DW的取值范围是：___
A. -1≤DW≤0
B. -1≤DW≤1
C. -2≤DW≤2
D. 0≤DW≤4
【单选题】
根据20个观测值估计的结果，一元线性回归模型的DW=2.6,在α=0.05的显著性水平下查得样本容量n=20，解释变量k=1个时，dL=1.20,dU=1.41，则可以判断：___
A. 不存在一阶自相关
B. 存在正的一阶自相关
C. 存在负的一阶自相关
D. 无法确定
【单选题】
根据样本资料建立某消费函数如下： =100.50+0.45Xt+55.35D，其中C为消费，X为收入，虚拟变量D= ，所有参数均检查显著，则城市的消费函数为：___
A. =155.85+0.45Xt
B. =100.50+0.45Xt
C. =100.50+55.35D
D. =100.95+55.35D
【单选题】
根据样本资料建立的消费函数为 ，其中为消费，为收入，虚拟变量 ，所有参数均检验显著，则城镇家庭消费函数估计式为___
【单选题】
设消费函数为 ，其中虚拟变量 ，当统计检验表明下列哪项成立时，表示城镇家庭与农村家庭有一样的消费行为___
【单选题】
使用多项式方法估计有限分布滞后模型时，多项式 i=α0+α1i+α2i2…αnim的阶数m的确定方法为___
A. 事先给定
B. 通过逐步计算确定
C. 由模型自动生成
D. 随意定
【单选题】
对于模型：Yt=α+β0Xt+β1Xt-1+β2Xt-2+…+βiXt-i+μt，如果有βi=β0λi,0<λ<1，则称原模型为：___
A. 变参数模型
B. 有限分布滞后模型
C. 有限多项式滞后模型
D. 考伊克模型
【单选题】
在估计分布滞后模型参数时，一般是对分布滞后模型施加约束条件，以便减少模型中的参数。以下约束条件中，错误的是___
A. 系数值βi先增加后下降
B. 系数值βi先下降后增加再下降
C. 系数值βi按几何级数增加
D. 系数值βi按几何级数衰减
【单选题】
下面关于内生变量的表述，错误的是___
A. 内生变量都是随机变量
B. 内生变量受模型中其它内生变量的影响，同时又影响其它内生变量
C. 在结构式方程中，解释变量可以是前定变量，也可以是内生变量
D. 滞后内生变量与内生变量具有相同性质
【单选题】
在结构式模型中，其解释变量___
A. 都是前定变量
B. 都是内生变量
C. 可以既有内生变量又有前定变量
D. 都是外生变量
【单选题】
联立方程模型中的非随机方程是：___
A. 行为方程
B. 技术方程
C. 制度方程
D. 平衡方程
【单选题】
第一个结构方程中的Y2是：___
A. 前定变量
B. 外生变量
C. 解释变量
D. 被解释变量
