Network+ Guide to Networks – Chapter 7 – Flashcards
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False
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T/F: In a star topology, a single connection failure will halt all traffic between all sites.
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True
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T/F: Dial-up ISDN does not convert a computer's digital signals to analog before transmitting them over the PSTN.
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True
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T/F: ATM is a WAN technology that functions in the Data Link layer.
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True
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T/F: SONET specifies framing and multiplexing techniques at the Physical layer.
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False
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T/F: The PPTP VPN tunneling protocol is based on technology developed by Cisco.
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publicly
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WANs typically send data over ____ available communications networks.
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WAN sites
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The individual geographic locations connected by a WAN are known as ____.
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nonroutable
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Because WAN connections require routers or other Layer 3 devices to connect locations, their links are not capable of carrying ____ protocols.
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redundant
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On most modern WANs, a ring topology relies on ____ rings to carry data.
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local loop
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The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.
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marginal
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A PSTN offers ____ security.
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frame relay
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____ is an updated, digital version of X.25 that also relies on packet switching.
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bonding
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In a process called ____, two 64-Kbps ISDN B channels can be combined to achieve an effective throughput of 128 Kbps.
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terminal adapter
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A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.
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23
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ISDN PRI uses ____ B channels and one 64-Kbps D channel.
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signal
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The speed of a T-carrier depends on its ____ level.
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smart jack
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At the customer's demarcation point, either inside or outside the building, T-carrier wire pairs terminate with a ____.
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DSLAM
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A ____ aggregates multiple DSL subscriber lines and connects them to the carrier's CO.
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security
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Broadband cable requires many subscribers to share the same local line, thus raising concerns about ____ and actual (versus theoretical) throughput.
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fixed packet
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What sets ATM apart from Ethernet is its ____ size.
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fault tolerance
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SONET's extraordinary ____ results from its use of a double-ring topology over fiber-optic cable.
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OC level
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The data rate of a particular SONET ring is indicated by its ____, a rating that is internationally recognized by networking professionals and standards organizations.
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Dial-up
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____ networking refers to dialing directly into a private network's or ISP's remote access server to log on to a network.
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PPP
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____ is the preferred communications protocol for remote access communications.
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PPPoE
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____ is the standard for connecting home computers to an ISP via DSL or broadband cable.
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remote
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____ virtual computing allows a user on one computer, called the client, to control another computer, called the host or server, across a network connection.
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virtual circuits
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______ are connections between network nodes that, although based on potentially disparate physical links, logically appear to be direct, dedicated links between those nodes.
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T-carrier
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A(n) ____________________ uses TDM (time division multiplexing) over two wire to divide a single channel into multiple channels.
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LANE
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____ encapsulates incoming Ethernet or token ring frames, then converts them into ATM cells for transmission over an ATM network.
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remote desktop
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____________________ is the remote virtual computing software that comes with Windows client and server operating systems.
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VNC
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________ is an open source system designed to allow one workstation to remotely manipulate and receive screen updates from another workstation.
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signal level
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Refers to the T-carrier's Physical layer electrical signaling characteristics as defined by ANSI standards in the early 1980s.
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upstream
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Occurs when data travels from the customer to the carrier's switching facility.
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downstream
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Occurs when data travels from the carrier's switching facility to the customer.
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bus topology WAN
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Occurs when each site is directly connected to no more than two other sites in a serial fashion.
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symmetrical technology
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Provides equal capacity for data traveling both upstream and downstream.
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asymmetrical technology
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Occurs when downstream throughput is higher than upstream throughput.
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star topology WAN
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Contains a single site acting as the central connection point for several other points.
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mesh topology WAN
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Incorporates many directly interconnected sites.
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tiered topology WAN
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Contain sites that are connected in star or ring formations are interconnected at different levels, with the interconnection points being organized into layers to form hierarchical groupings.
