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？（）
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
点击查看答案
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
what device sends IGMP Query messages？
Which action does the ping 172.18.1.1 size 5 command perform?（）A、It sends only five ping requests to the 172.18.1.1 destination.B、It sends a continuous ping with a packet length of five bytes to the 172.18.1.1 destination.C、It sends five rapid ping requests to the 172.18.1.1 destination.D、It sends a continuous rapid ping with a packet length of five bytes to the 172.18.1.1 destination.
How does the PFE handle unicast transit traffic destined for an existing forwarding table entry?（）A、It sends the traffic through one egress port toward its destinationB、It sends the traffic through multiple egress ports to all available receiversC、It sends the traffic through an internal link to the RED、It sends the traffic to the local system for further processing
The CS-MARS appliance offers attackmitigatons using which twomethods？ （）A、 Automatically pushing ACLs to layer 3 devices to block the attacker’s trafficB、 Automatically pushing commands to layer 2 switches to shutdown the attacker’s portsC、 Automatically resetting the attacker’sTCP connectionsD、 RecommendingACLs tobe manuallypushed tolayer 3 devices such as routers/firewallsE、 Operating as an inline appliance， it automaticallyblocks malicious traffic inlineF、 Working inconjuction with CSM to block the attacker’s traffic inline
Which of the following are not steps in setting up aTLS session？ （）A、 Client sends Hello to Server listing all of its supported cipher suitesB、 Server sends Hello to Client listing all of its supported cipher suitesC、 Client calculates and sends encryptedpre_master_secretD、 Client and Server calculate keys from pre_master_secretE、 Server sends Change Cipher Spec to indicate a shift to encrypted mode
