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44 Cards in this Set
- Front
- Back
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used to establish and terminate telephone calls
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signaling
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suite of protocols that defines how voice and video are transported over networks
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H.323
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simplifies the interconnection between the IP-PBX and the PSTN
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virtual tie line
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signaling technique used by the PSTN
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SS7
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encodes, compresses, and decodes the data
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CODEC
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produces a poorly reconstructed signal at the receiver due to variability in data packet arrival
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jitter
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reproduces playback of the voice packets withthe same time interval as they were recorded
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timestamp
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used to interconnect PBXs
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tie line
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uses to keep track of the order of the data packets
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packet sequence number
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Provides control of the data packet transfer
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queuing
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specialized container that allows group policies to be set
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organizational unit
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the time it takes for data packets to travel from source to destination
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network latency
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a centralized system in a Microsoft server network that automates the management of user data, sercurity, and distributed services
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AD
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a collection of domain
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forest
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a domain
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client/server network
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a subset domain of the main tree
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tree
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all computers in the network provide similar services including server functions
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peer to peer network
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computer connected to the network that accesses services from the server
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client
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computer tha uses and provides resources tothe network
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network server
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provides access to services onthe network
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domain controller
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small, limited function application often used in control panels and on Web pages
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applet
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collection of users that can be used to set policy at the domain or oraganizational unit level
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group
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Microsoft command that allows a message to be sent over the network to a user
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net send
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Microsoft command that displayes the current users connected tothe server
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net session
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the server verifies that the computer and user are authorized to access the network
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authenticated
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Windoes 2003/2000 server name for a folder
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container
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functions provided by a gateway in a VOIP system
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- performs proper signaling for the voice packets
- encapsulating the data packets for transport over the IP network - interfaces IP telephone to the PSTN |
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What are RTP and RTCP used for in VoIP
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- manages the synchronization, packet identification, and transport of the data
-provides a timestamp and a packet sequence number |
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What are three ways a company can implement VoIP into their network
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- Swithc the company over to a complete IP telephone system
-Upgrade the company's existing PBX to support IP telephony - Replace an existing PBX voice tie line with a VoIP gateway |
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What does it mean for a user to be authenticated
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the server verifies that the computer and user are authorized to access the network
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What are two advantages of replacing an existing PBX tie line with a VoIP/Data network
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-sites can still use the existing PBS, telephones, and connections tothe local PSTN
- Voice and data traffic are combined for more effiecient use of the network's available bandwidth |
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What are three QoS issues for a VoIP network
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- network latency and packet loss
-jitter -queuing |
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What causes jitter in the receive signal
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variability in the data packet arrival
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How can the effects of jitter be minimized
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use a buffer to removed the variations in packet arrival times
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What does a processor in a VoIP receiver do if a voice data packet is lost
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lost data packet is filled in with the previously received data packet
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What is WFQ, and what is the purpose
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WFQ is used to determine what traffic gets priority for transmission
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What is WRED, and waht is its purpose
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WRED intelligently discards lower-priority packets to minimized traffic congestion
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What are the characteristics of a client/server network
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- no centralized administration
-easy sharing of network resources |
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How is the timestamp on VoIP data packets used
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to playback voice packets inthe same sequence as recorded
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Whay should a network administrator limit the number of logon attempts to a server
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slows down passwork attacks
prevents an unauthorized user from attempting repeated logins |
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the command net session enables the network administrator to
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identify the users currently connected to the server
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An authorized user on the network can't log on what should the administrator check
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- see whether their account has been locked out
- user using an incorrect password |
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the command for sending a notice to all users on the chile network is
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net send/chile
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what is the basic form of queuing
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FIFO
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