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14 Cards in this Set
- Front
- Back
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What is the acronym PDU?
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Protocol Data Unit.
Also called a packet. The encapsulation process creates a protocol data unit (PDU), which includes the data being sent and all header or footer information added to it. As data moves down the OSI model, the PDU changes and grows as header and footer information from various protocols is added to it. The PDU is in its final form once it reaches the physical layer, at which point it is sent to the destination computer. The receiving computer strips the protocol headers and footers from the PDU as the data climbs up the OSI layers. Once the PDU reaches the top layer of the OSI model, only the original data remains. |
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What port is used for the FTP data stream?
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Port 20
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What port is used for the FTP control stream?
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Port 21
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Telnet uses what port?
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Port 23
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What is the acronym SMTP?
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Simple Mail Transfer Protocol
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What port is used by SMTP?
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Port 25
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What is the acronym DNS?
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Domain Name Service
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What port does DNS use?
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Port 53
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What is the acronym TFTP?
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Trivial File Transfer Protocol
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What port is used by TFTP?
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Port 69
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What is the acronym HTTP?
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Hypertext Transfer Protocol
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What is the acronym SNMP?
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Simple Network Management Protocol
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What ports are used by SNMP?
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Ports 161 and 162.
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What is the acronym ARP?
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Address Resolution Protocol
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