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Infrastructure Chapter 5
Chapter 5
28
Computer Networking
Undergraduate 2
06/25/2012

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Term
authenticator
Definition
802.1X component that requests authentication credentials from supplicants.
Term
Authorization Server (AS)
Definition
802.1X component that verifies the supplicant’s authentication credentials.
Term
bits
Definition
Binary sequences of 0s and 1s used to encode traffic onto physical network media.
Term
default route
Definition
Routing table entry that indicates the route that will be used if no other defined routes match a particular destination
Term
Dial-Up Networking (DUN)
Definition
Creates a physical connection to a remote network by using a dial-up device such, as a POTS modem or a demand-dial ISDN modem
Term
directly attached network routes
Definition
Routes to destination networks for which the router in question is directly attached.
Term
EAP-Logoff
Definition
802.1X packet sent from a supplicant to an authenticator, instructing the supplicant to place the port back in an unauthenticated state.
Term
frames
Definition
Data at Layer 2 of the OSI model (the Data Link Layer) is organized into frames for processing by higher levels of the OSI model.
Term
host routes
Definition
Routing table entry that defines a route to a particular destination host rather than a destination network.
Term
hub
Definition
Network device that operates at the Physical Layer (Layer 1) of the OSI model
Term
Layer 3 device
Definition
A router would be a layer 3 device
Term
limited broadcast address
Definition
Reserved IP address (255.255.255.255) used as the broadcast address for all networks and routers.
Term
loopback address
Definition
Reserved IP address (127.0.0.1) used for troubleshooting and testing.
Term
metric
Definition
Column in a routing table that indicates the cost of using one route instead of another.
Term
network access control
Definition
Standard for allowing or disallowing network access based on administrator-specified criteria
Term
Network Policy Server (NPS)
Definition
Windows Server 2008 implementation of RADIUS.
Term
Open Shortest Path First (OSPF)
Definition
Routing protocol in which individual routers maintain a database of all reachable networks that it is aware of and share this database with neighboring routers.
Term
packets
Definition
Data at Layer 3 of the OSI model (the Network Layer) is organized into packets for transmission to local or remote networks.
Term
Physical Layer
Definition
Layer 1 of the OSI model, where bits of data interface with the physical network media.
Term
remote network routes
Definition
Routes to destination networks that the router in question is not directly attached to.
Term
router
Definition
Layer 3 network device that transmits data between local and remote networks
Term
routing protocols
Definition
Used in lieu of static routes in more complex network environments to simplify the administration of network routing.
Term
Set by Caller
Definition
Callback option that allows the user to specify the callback number at the time the connection is made.
Term
software-based router
Definition
Router running on a computer running an operating system, such as Windows Server 2008, that can also be used for other functions.
Term
Strongest Encryption (MPPE 128-bit)
Definition
128-bit encryption used for VPN connections
Term
supplicant
Definition
802.1X device that is seeking access to the network, such as a laptop attempting to access a wireless access point
Term
switch
Definition
Layer 2 network device that examines the source and destination MAC address of the network data to determine where the data should be sent.
Term
Virtual Private Network (VPN)
Definition
Creates a secured logical connection to a remote network over a non-secure network, such as the Internet.
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