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| Serve as a gateway between a trusted and untrusted network that gives limited, authorized access to untrusted hosts. |
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| Layer 2 devices that filter traffic between segments based on Media Access Control (MAC) addresses. |
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| Sublayer that provides services for the application layer and request services from the session layer |
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| Common application service element (CASE) |
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| Multiplex connected devices into one signal to be transmitted on a network |
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| A wireless technology that spreads a transmission over a much larger frequency band, and with corresponding smaller amplitude |
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| Direct-Sequence Spread Spectrum (DSSS) |
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| The process of transforming encrypted data back into its original form, so it can be understood. |
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| A lightweight encapsulation protocol and lacks the reliable data transport of the TCP layer |
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| Fibre Channel over Ethernet (FCoE) |
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| A stateful protocol that requires two communication channels |
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| File Transfer Protocol (FTP) |
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| Devices that enforce administrative security policies by filtering incoming traffic based on a set of rules |
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| This wireless technology spreads its signal over rapidly changing frequencies |
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Definition
| Frequency-Hopping Spread Spectrum (FHSS) |
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| Provides a means to send error messages for non-transient error conditions and provides a way to probe the network in order to determine general characteristics about the network. |
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Definition
| Internet Control Message Protocol (ICMP) |
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| A client/server-based directory query protocol loosely based upon X.500, commonly used for managing user information |
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Definition
| Lightweight Directory Access Protocol (LDAP) |
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| Allow users remote access to a network via analog phone lines |
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| Layering model structured into seven layers (physical layer, data-link layer, network layer, transport layer, session layer, presentation layer, application layer) |
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| A basic network mapping technique that helps narrow the scope of an attack |
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| Involves a pair of keys-a public key and a private key-associated with an entity that needs to authenticate its identity electronically or to sign or encrypt data |
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| An authentication protocol used mainly in networked environments, such as ISPs, or for similar services requiring single sign-on for layer 3 network access, for scalable authentication combined with an acceptable degree of security. |
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Definition
| Remote Authentication Dial-in User Service (RADIUS) |
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| Represent the ability to allow for the executing of objects across hosts |
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Definition
| Remote Procedure Calls (RPC) |
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| A program which can extract data from output on a display intended for a human |
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| The first line of protection between trusted and untrusted networks |
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| Sublayer that provides application specific services (protocols) |
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| Specific application service element (SASE) |
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| A method commonly used to modulate information into manageable bits that are sent over the air wirelessly |
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| Layering model structured into four layers (link layer, network layer, transport layer, application layer) |
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Definition
| TCP/IP or Department of Defense (DoD) model |
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| A diagnostic tool that displays the path a packet traverses between a source and destination host |
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| Provides connection-oriented data management and reliable data transfer |
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Definition
| Transmission Control Protocol (TCP) |
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| Provides a lightweight service for connectionless data transfer without error detection and correction |
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Definition
| User Datagram Protocol (UDP) |
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| An encrypted tunnel between two hosts that allows them to securely communicate over an untrusted network |
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Definition
| Virtual Private Network (VPN) |
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| A technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line |
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Definition
| Voice over Internet Protocol (VoIP) |
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| Links two or more devices over a short distance using a wireless distribution method, usually providing a connection through an access point for Internet access. |
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Definition
| Wireless local area network (WLAN) |
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| A wireless network made up of radio nodes organized in a mesh topology |
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| A type of wireless network that connects several wireless LANs |
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| Wireless metropolitan area networks |
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| A type of wireless network that connects several wireless LANs |
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| Wireless metropolitan area networks |
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| Interconnect devices within a relatively small area that is generally within a person's reach |
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Definition
| Wireless personal area networks (WPANs) |
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