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There are different ways to perform IP based DoS Attacks. The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment?（ ）(e.g. TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other?（请作答此空）, the attacker inserts a large amount of?（ ）packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an?（ ）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy?mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution（LTE）eNodeB ?is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（ ）the network.
A. methods
B. cases
C. hands
D. sections
B. cases
C. hands
D. sections
参考答案
参考解析
解析：执行基于IP的DoS攻击，有不同的方法。最常见的基于IP的DoS攻击是攻击者发送大量连接建立请求（例如，TCP SYN请求）以建立与控制器或DPS的挂起连接。这样，攻击者就可以消耗合法用户所需的网络资源。在其他情况下，攻击者通过用随机值欺骗全部或部分头字段，向数据域中插入大量假数据包。这些传入的数据包将触发表丢失，并在流请求消息中发送大量到网络控制器造成控制器资源饱和。在某些情况下，获得DPS访问权的攻击者可以在流请求消息中人为地生成大量随机包，以使控制通道和控制器资源饱和。此外，DPS间的多样性不足也助长了此类攻击的快速传播。传统的移动回程设备由于其复杂性以及是供应商专属设备，天然是防止攻击传播的。此外，传统的移动回程设备不需要与核心控制器频繁通信，而DPS与中央控制器的通信则需要频繁通信。这些特性降低了DoS攻击的影响和传播。此外，传统的回程设备是由多个网络元素共同控制的。例如，单一的长期演化（LTE）基站连接多达32个MME（负责信令处理的关键节点）。因此，对单个核心元素的DoS/DDOS攻击不会终止回程设备或网络的整个操作。
更多 “There are different ways to perform IP based DoS Attacks. The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment?（ ）(e.g. TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other?（请作答此空）, the attacker inserts a large amount of?（ ）packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an?（ ）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy?mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution（LTE）eNodeB ?is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（ ）the network.A. methods B. cases C. hands D. sections ” 相关考题
考题
下列网络攻击行为中,属于DoS攻击的是__(42)__。A.特洛伊木马攻击B.SYN Flooding攻击S
下列网络攻击行为中，属于DoS攻击的是__（42）__。A.特洛伊木马攻击B.SYN Flooding攻击C.端口欺骗攻击D.IP欺骗攻击
考题
There are different ways to perform. IP based DoS Attacks.The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment (1)(e.g.TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other (2), the attacker inserts a large amount of (3)packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an (4)who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution(LTE) eNodeB is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device(5)the net work.A.message B.information C.request D.dateA.methods B.cases C.hands D.sectionsA.bad B.cases C.fake D.newA.or B.administrator C.editor D.attackerA.or B.of C.in D.to
考题
There are different ways to perform IP based DoS Attacks. The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment（ ）(e.g. TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other（ ）, the attacker inserts a large amount of（ ）packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an（ ）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy?mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution（LTE）eNodeB ?is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（请作答此空）the network.A. or
B. of
C. in
D .to
考题
There are different ways to perform IP based DoS Attacks. The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment（ ）(e.g. TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other（ ）, the attacker inserts a large amount of（ ）packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an（请作答此空）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy?mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution（LTE）eNodeB ?is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（）the network.A. or
B. administrator
C. editor
D. attacker
考题
There are different ways to perform IP based DoS Attacks.The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment（71）（e.g.TCP SYN requests）to establish hanging connections with the controller or a DPS.Such a way,the attacker can consume the network resources which should be available for legitimate users.In other（本题）,the attacker inserts a large amount of（73）packets to the data plane by spoofing all or part of the header fields with random values.These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources.In some cases,an（74）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources.Moreover,the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment.Moreover,legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller.These features minimize both the impact and propagation of DoS attacks.Moreover,the legacy backhaul devices are controlled as a joint effort of multiple network element.For instance,a single Long Term Evilution（LTE）eNodeB is connected up to 32 MMEs.Therefore,DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（75）the network.
A.methods
B.cases
C.hands
D.sections
考题
There are different ways to perform IP based DoS Attacks.The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment（71）（e.g.TCP SYN requests）to establish hanging connections with the controller or a DPS.Such a way,the attacker can consume the network resources which should be available for legitimate users.In other（72）,the attacker inserts a large amount of（73）packets to the data plane by spoofing all or part of the header fields with random values.These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources.In some cases,an（本题）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources.Moreover,the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.Legacy mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment.Moreover,legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller.These features minimize both the impact and propagation of DoS attacks.Moreover,the legacy backhaul devices are controlled as a joint effort of multiple network element.For instance,a single Long Term Evilution（LTE）eNodeB is connected up to 32 MMEs.Therefore,DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（75）the network.
A.or
B.administrator
C.editor
D.attacker
考题
Which of the following types of attacks does DHCP snooping prevent？（Choose all that apply.）（）A、Attacker sends multiple DHCP requests flooding DHCP serverB、Attacker connects rogue server initiating DHCP requestsC、Attacker connects rogue server replying to DHCP requestsD、Attacker sends DHCP jam signal causing DHCP server to crashE、Attacker sends gratuitous ARP replies， thereby jamming the DHCP serverF、Attacker sends unsolicited DHCP replies， thereby jamming the DHCP server
考题
Which two network attack statements are true？（）A、Access attacks can consist of password attacks，trust exploitation，port redirection，and man-in-the-middle attacks.B、Access attacks can consist of UDP and TCP SYN flooding，ICMP echo-request floods，and ICMP directed broadcasts.C、DoS attacks can be reduced through the use of access control configuration，encryption，and RFC 2827 filtering.D、DoS attacks can consist of IP spoofing and DDoS attacks.E、IP spoofing can be reduced through the use of policy-based routing.F、IP spoofing exploits known vulnerabilities in authentication services， FTP services，and web services to gain entry to web accounts，confidential databases，and other sensitive information.
考题
Which statement is true about a Smurf attack？（）A、It sends ping requests in segments of an invalid sizeB、It intercepts the third step in a TCP three-way handshake to hijack a sessionC、It sends ping requests to a subnet， requesting that devices on that subnet send ping replies to a targetsystemD、It uses Trojan horse applications to create a distributed collection of "zombie" computers， which can beused to launch a coordinated DDoS attack
考题
Firewall filters can be used to accept, discard, or reject packets based on （）A、protocol typeB、MAC addressC、TCP or UDP portD、source and destination IP address
考题
An attacker sends a low rate of TCP SYN segments to hosts， hoping that at least one port replies. Which type of an attack does this scenario describe？（）A、DoSB、SYN floodC、port scanningD、IP address sweep
考题
You are the desktop administrator for ExamSheet. Your Windows 2000 Professional computer is configured to support two monitors. You install a DOS-based application on your computer. The application uses the Windows 2000 Professional default settings Autoexec.nt and Config.nt. Your primary video adapter is set to 24 bit color, 800 x 600 resolution, and default refresh rates. Your secondary video adapter is set to 32 bit color, 1024 x 768 resolution, and a refresh refresh of 72 hertz. You create a shortcut for the DOS-based application on the secondary monitor's desktop and use the default PIF settings. You attempt to run the DOS-based application on the secondary monitor. The application opens, but the display area is scrambled. You then attempt to run the DOS-based application on the primary monitor. The application does not open. Both monitors function correctly when you run Windows based applications. You want to be able to run the DOS-based application on either monitor. What should you do?（）A、Reconfigure the shortcut properties to run the DOS-based application in full screen mode.B、Reconfigure the PIF settings of the DOS-based application to start in a window.C、Change the drivers for both video adapters from WDM compliant drivers to DOS drivers.D、Change the refresh rate setting to 72 hertz for both video adapters.E、Change the color setting for both video adapters to 256 colors.
考题
单选题An attacker sends a low rate of TCP SYN segments to hosts， hoping that at least one port replies. Which type of an attack does this scenario describe？（）A
DoSB
SYN floodC
port scanningD
IP address sweep
考题
多选题You are the desktop administrator for ExamSheet. Your Windows 2000 Professional computer is configured to support two monitors. You install a DOS-based application on your computer. The application uses the Windows 2000 Professional default settings Autoexec.nt and Config.nt. Your primary and secondary video adapters are both set to 32 bit color, 800 x 600 resolution, and default refresh rates. You create a shortcut for the DOS-based application on the primary monitor's desktop and use the default PIF settings. You attempt to run the DOS-based application on the primary monitor. The application opens, but the display area is scrambled. You then attempt to run the DOS-based application on the secondary monitor. The application does not open. Both monitors function correctly when you run Windows based applications. You want to be able to run the DOS-based application on either monitor. What should you do?（）AReconfigure the PIF settings of the DOS-based application to start in a window.BReconfigure the shortcut properties to run the DOS-based application in full screen mode.CChange the drivers for both video adapters from WDM compliant drivers to DOS drivers.DChange the refresh rate setting to 72 hertz for both video adapters.EChange the color setting for both video adapters to 256 colors.
考题
多选题You are the desktop administrator for ExamSheet. Your Windows 2000 Professional computer is configured to support two monitors. You install a DOS-based application on your computer. The application uses the Windows 2000 Professional default settings Autoexec.nt and Config.nt. Your primary video adapter is set to 24 bit color, 800 x 600 resolution, and default refresh rates. Your secondary video adapter is set to 32 bit color, 1024 x 768 resolution, and a refresh refresh of 72 hertz. You create a shortcut for the DOS-based application on the secondary monitor's desktop and use the default PIF settings. You attempt to run the DOS-based application on the secondary monitor. The application opens, but the display area is scrambled. You then attempt to run the DOS-based application on the primary monitor. The application does not open. Both monitors function correctly when you run Windows based applications. You want to be able to run the DOS-based application on either monitor. What should you do?（）AReconfigure the shortcut properties to run the DOS-based application in full screen mode.BReconfigure the PIF settings of the DOS-based application to start in a window.CChange the drivers for both video adapters from WDM compliant drivers to DOS drivers.DChange the refresh rate setting to 72 hertz for both video adapters.EChange the color setting for both video adapters to 256 colors.
考题
单选题How would you characterize the source and type in a denial of service attack on a router？（）A
By perfornubg a show ip interface to see the type and source of the attack based upon the access-listmatchesB
By performing a show interface to see the transmitted load txload and receive load rxload ；if the interface utilization is not maxed out ，there is no attack underwayC
By setting up an access-list to permit all ICMP，TCP，and UDP traffic with the log or log-input commands，then use the show access-list and show log commands to determine the type and sourceof attackD
By applying an access-list to all incoming and outgoing interfaces，turning off route-cache on all interfaces，then，when telnetting into the router perform a debug IP packet detail
考题
单选题Which JUNOS software feature allows a user to define specific next-hop values for IP packets based on the source IP address of that packet？（）A
MPLSB
Load BalancingC
Class Based ForwardingD
Filter Based Forwarding
考题
单选题Which statement is true about a Smurf attack？（）A
It sends ping requests in segments of an invalid sizeB
It intercepts the third step in a TCP three-way handshake to hijack a sessionC
It sends ping requests to a subnet， requesting that devices on that subnet send ping replies to a targetsystemD
It uses Trojan horse applications to create a distributed collection of zombie computers， which can beused to launch a coordinated DDoS attack
考题
单选题Your Windows 2000 Professional computer is configured to support two monitors. You install a DOS-based application on your computer. The application uses the Windows 2000 Professional default settings Autoexec.nt and Config.nt. Your primary and secondary video adapter are both set to 16-bit color,1024x 768 resolution, and default refresh rates. You create a shortcut for the DOS-based application on the primary monitor’s desktop and use the default PIF settings. Your attempt to run the DOS-based application on the primary monitor. The application opens, but the display area is scrambled. You then attempt to run the DOS-based application on the secondary monitor. The application does not open. Both monitors function correctly when you run Windows-based applications. What should you do?（ ）A
Change the color setting for both video adapters to 256 colors. Reconfigure the shortcut properties to run the DOS-based application in full-screen mode.B
Change the refresh rate setting to optimal for both video adapter. Reconfigure the PIF settings of the DOS-based application to start in a window.C
Change the drivers for the secondary video adapter from WDM-compliant drivers to DOS drivers. Reconfigure the PIF settings to run the DOS-based application in full-screen modeD
Update the drivers for the primary video adapter. Change the secondary video adapter to use 640 x 480 resolution and 256 colors.
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