Term
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Definition
| Two or more devices connected together in order to pass data |
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Term
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Definition
| 7 Layer networking model: 1:Physical, 2:Data Link, 3:Network, 4:Transport, 5:Session, 6:Presentation, 7:Application |
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Definition
| OSI Model Layer 7: Ensures that remote user is available, needed connection devices exist, both user devices agree on protocals for data privacy, integrity, and error recovery. Provides network authentication. |
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| Application Layer 7 Protocols |
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Definition
| Email protocols SMTP and POP3, Telnet, HTTP, File Transfer Protocol (FTP), Simple Network Management Protocol (SNMP) |
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Definition
| OSI Model Layer 6: Checks compatibility with operating system, properly encapsulates data for network transmision, properly formats data, and encrypts, compresses, and translates data. |
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| Presentation Layer 6 file types |
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Definition
| JPEG,ASCII,GIF,MPEG,MIDI,EBCDIC, and TIFF |
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Definition
| OSI Model Layer 5: manages two-way communication between hosts. Creates, maintains, and tearsdown communication sessions. |
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Definition
| OSI Model Layer 4: establishes logical end-to-end connection between two systems. Segments data from upper layers and ensures data is delivered in correct order and without errors. |
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Term
| Transport Layer 4 methods of transport |
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Definition
| Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) |
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Definition
| OSI Model Layer 3: Routing layer, validates existing paths from local router to a given destination and determines optimal path to get to that destination. Internet Protocol (IP) runs on this layer. |
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Definition
| OSI Model Layer 2: Switching layer, layer at which internet access devices connect(i.e., Modems, Wireless Access Points (WAPS), Switches, and Hubs). Performs error detection with Frame Check Sequencing, but does not perform error recovery. Uses MAC addresses as Layer 2 addresses |
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Term
| Data Link Layer 2 specifications |
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Definition
| Ethernet, High Data Link Control (HDLC), Point-to-point Protocol (PPP), Frame Relay |
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Term
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Definition
| Hardware addresses, physical addresses, burned-in address (BIA); physically burned into Network Interface Card (NIC)by the manufacturer of the device. |
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Term
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Definition
| OSI Model Layer 1: Handles actual data transmission as binary 1's and 0's. Includes physical connections of electrical current across cables and connectors and the network standards governing their use. |
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Term
| Application, Presentation, and Session layer PDU |
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Definition
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Definition
| Identifier added to the begining of each data unit of each layer that is removed by that same layer at the other end of the transmission. |
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Term
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Definition
| Identifier added along with the Data Link Header by the Data Link layer to identify the end of the transmitted data unit |
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Term
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Definition
| Protocol Data Unit - combonation of layer header and data passed to that layer from previous layer |
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Term
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Definition
| Action of a layer removing layer header of the same layer on the transmission side of a connection |
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Term
| Adjacent-layer interaction |
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Definition
| Action taken between layers on same side of transmission. (Addition of headers to previous PDU) |
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Term
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Definition
| 4 layer network model combining layers of OSI model. Layer 1: Network Access (Data Link, Physical), Layer 2: Internet (Network), Layer 3: Transport (Transport), Layer 4: Application (Application, Presentation, Session) |
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Term
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Definition
| Transmission Control Protocol: Guaranteed delivery, Error detection via sequence and Acknowledge numbers, Windowing, Connection-oriented |
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Term
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Definition
| User Datagram Protocol: best-effort delivery, but no guarantee of delivery, no error detection, no windowing, connectionless. |
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Term
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Definition
| TCP negotiation between transmitting host and recieving host using synchronization (SYN) segments and Acknowledge (ACK) segments to establish connection. |
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Term
| Order of TCP connection segments |
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Definition
| SYN sent, SYN/ACK reply, ACK sent to establish connection, FIN (Finish) bit sent to end connection. |
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Term
| TCP Error detection and recovery |
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Definition
| Sequence Numbers sent to establish order of segments, Acknowledge number replied with next sequence number expected. If number is correct transmission continues, if not (error detection) original sequence is resent (error recovery). |
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Term
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Definition
| Positive Acknowledgement with Retransmission: Sending host sets timer for recieving an ACK segment, if ACK segment is not received in that time host resends SYN segment. |
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Term
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Definition
| Recieving host sets amount of data flow it can recieve and sends this window size to the sending host. The windo size is dynamically set depending on the amount of errors detected. Dynamic adjustment known as sliding window. |
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Term
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Definition
| Identifies data flows between devices, pre-assigned by host or by protocol standard. Allows for multiplexing of diferent forms of data into the same stream. |
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Term
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Definition
| notation of IP, transport protocol, and port number (example: 192.76.1.2, UDP, 69 or 192.76.1.2:69) |
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Term
| Reserved port numbers (Well-known port numbers) |
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Definition
| All numbers less than 1024 |
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Term
| FTP (File Transfer Protocol) port #'s |
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Definition
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Term
| SSH (Secure Shell) port # |
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Definition
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| SMTP (Simple Mail Transfer Protocol) port # |
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Definition
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| HTTP (Hyper Text Transfer Protocol) port # |
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Definition
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| POP3 (Post Office Protocol 3) port # |
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Definition
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| SSL (Secure Socket Layer) port # |
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Definition
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| DHCP (Dynamic Host Control Protocol) port #'s |
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Definition
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| TFTP (Trivial File Transfer Protocol) port # |
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Definition
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Term
| SNMP (Simple Network Management Protocol) port # |
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Definition
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Term
| DNS (Domain Name Service) port # |
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Definition
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Definition
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| VoIP (Voice over IP) port #'s |
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