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防火墙的经典体系结构主要有三种，下图给出的是（）体系结构。

IP地址欺骗的发生过程，下列顺序正确的是（）。
①确定要攻击的主机A；
②发现和它有信任关系的主机B；
③猜测序列号；
④成功连接，留下后门；
⑤将B利用某种方法攻击瘫痪。

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 a mount 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 pcket-in flow request messages to saturate the control channel and the controller resources. Moreover，the lack of diversityamong 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 DoSattacks.Moreover，the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance，a single Long erm 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 network.

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 a mount 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 pcket-in flow request messages to saturate the control channel and the controller resources. Moreover，the lack of diversityamong 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 DoSattacks.Moreover，the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance，a single Long erm 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 network.

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 a mount 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 pcket-in flow request messages to saturate the control channel and the controller resources. Moreover，the lack of diversityamong 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 DoSattacks.Moreover，the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance，a single Long erm 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 network.

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 a mount 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 pcket-in flow request messages to saturate the control channel and the controller resources. Moreover，the lack of diversityamong 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 DoSattacks.Moreover，the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance，a single Long erm 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 network.

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 a mount 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 pcket-in flow request messages to saturate the control channel and the controller resources. Moreover，the lack of diversityamong 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 DoSattacks.Moreover，the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance，a single Long erm 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 network.