cisco certification uk

cisco certification uk

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5.4.4 Subnet filtering firewall structure Firewall design and creation (4) The firewall, as a "police" to prevent the occurrence of undesirable phenomena , can implement and strengthen the security strategy of the network. The working process of the POP3 protocol can be roughly divided into the following three steps: (3) Identify each interface. You can use the nameif command to name each interface, for the Cisco PIX 515 with 2 interfaces (8) The certificate issuer's signature on the certificate. The SSL standard mainly provides three types of services: data encryption service, authentication service and data integrity service. First of all, In the TCP/IP protocol standard, a three-way handshake between the client and the server is required to complete a TCP connection. First, the client has sent a SYN flag service request packet to the server, and the server returns a SYN + 1 of the ACK response packet, and then send the client receives an acknowledgment packet to the server. At this time, the client has successfully established a connection with the server, so that preparations are made for future communication. But an attack, an attacker using a fake IP address sent only dummy made without receiving a response packet, the server so that a large number of "half-open connection", since each packet has a certain waiting server response time, and when If no response is received for a certain period of time, it will be retransmitted many times. Therefore, the server forms a large number of half-open connections during the retransmission and waiting process. In this way an attacker can send a large number of false by multiple computers IP source address of the SYN packet, causing the server CPU occupancy excessive, when a certain amount, to form a denial of service. At the same time, since most of the requests of legitimate users are overwhelmed by the attack package, even if the server does not crash at this time,cisco certification uk, it is unable to respond to the request.

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Latest Cisco CCNA 200-301 Dumps

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