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Transmission Control Protocol/Internet Protocol (TCP/IP) |
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Most common protocol suite used for local area networks and the Internet |
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Protocol that functions primarily at Open Systems Interconnection (OSI) Network Layer (Layer 3) |
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Transport Layer (Layer 4) protocol |
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Used to relay query messages |
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Network discovery – Smurf DoS attack – ICMP redirect attack – Ping of death |
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SNMP Simple Network Management Protocol |
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Agents are password protected – Password is known as community string |
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Database with name of each site and corresponding IP number |
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substitutes fraudulent IP address • Can be done in local host table or external DNS server • Latest edition of DNS software prevents DNS poisoning – Zone transfer allows attacker access to network, hardware, and operating system information – BIND |
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Secure router configuration |
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Router operates at Network Layer (Layer 3) • Forwards packets across computer networks |
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Converges voice and data traffic over single IP network – IP telephony adds digital voice clients and new voice applications to a data based network |
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An attacker can use ICMP messages as one of the first steps in reconnaissance to discover information about the hosts that are part of the network. This can include sending individual ICMP echo request to the broadcast addresses of a network and sending an ICMP address mask request to a host on the network to determine the subnet mask |
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Broadcast a ping request (which uses ICMP) to all computers on the network but chnage the address from which the request came to that target. This makes it appear that the target computer is asking for a response from all computers. Each of the computers then responds to the target server, overwhelming it and causing it to crash or be unavailable to legitimate users |
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redirect packet iss ent tot he victim that asks the host to send its packets to another router which is usually a malicious device |
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A malformed ping using ICMP is sent to the victims computer that exceeds the size of an IP packet, this causes the host to crash |
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Berkeley Internet Name Domain |
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Internet Control message protocol |
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