Subnet mask a 32 bit address used to mask or screen a

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subnet mask A 32-bit address used to mask, or screen, a portion of an IP address to differentiate the part of the address that designates the network and the part that designates the host. subnetting The process of using parts of the node portion of an assigned IP address to create more network IDs. Although subnetting increases the number of network IDs, it decreases the number of node addresses available for each network ID. supernetting The process of aggregating IP network addresses and using them as a single network address range. surge A voltage increase that is less dramatic than that of a spike but can last much longer. Sometimes called a swell. The opposite of a brownout. surge protector An inexpensive and simple device placed between a power outlet and a network component to protect the component from spikes and surges. Also known as a surge suppressor. SVC (switched virtual circuit) A virtual circuit dynamically established on demand to form a dedicated link. It is broken when transmission is complete. switch A Layer 2 networking device that forwards frames based on destination addresses. SYN A message sent to initiate a TCP session between two devices. The full term is synchronization packet .
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TFTP (Trivial File Transfer Protocol) 595 in one communication channel. Despite being only a single channel, data signals take turns sending data. TDR (time-domain reflectometer) A device used to test copper cables to determine whether and where a break is on the cable. For optical cables, an optical TDR is used. Telco (telephone company) A slang term for the telephone provider in question. Telnet A standard terminal emulation protocol in the TCP/ IP stack. Telnet is used to perform terminal emulation over TCP/IP via remote terminal connections, enabling users to log in to remote systems and use resources as if they were connected to a local system. temperature monitor A device used to monitor temperature typically in a server room or wiring closet. Terminal Services A service on Windows Server platforms that enables clients to connect to the server as if it were a multiuser operating system. All the processing for the client session is performed on the server. Only screen updates and user input are transmitted across the network connection. Window Server 2008 R2 and later versions have replaced Terminal Services with Remote Desktop Services (RDS). TFTP (Trivial File Transfer Protocol) A simplified version of FTP that enables file transfers but does not offer any security or file management capabilities. TFTP uses TCP/IP port 69. TACACS+ (Terminal Access Controller Access Control System Plus) A security protocol designed to provide centralized validation of users who are attempting to gain access to a router or network access server (NAS). TACACS+ is a set of security protocols designed to provide authentication, authorization, and accounting (AAA) of remote users. TACACS+ uses TCP port 49 by default.
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  • Fall '15
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