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RPC
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Several types of remote procedure calls have been defined. The RPC mechanism defined in :rfc:`5531` is used by applications such as NFS
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SDU (Service Data Unit)
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a Service Data Unit is the unit information transferred between applications
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segment
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a segment is the unit of information transfer in the transport layer
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SMTP
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The Simple Mail Transfer Protocol is defined in :rfc:`821`
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SNMP
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The Simple Network Management Protocol is a management protocol defined for TCP/IP networks.
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socket
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A low-level API originally defined on Berkeley Unix to allow programmers to develop clients and servers.
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spoofed packet
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A packet is said to be spoofed when the sender of the packet has used as source address a different address than its own.
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The Secure Shell (SSH) Transport Layer Protocol is defined in :rfc:`4253`
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standard query
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For DNS servers and resolvers, a standard query is a query for a `A` or a `AAAA` record. Such a query typically returns an IP address.
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switch
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A relay operating in the datalink layer.
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SYN cookie
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