Designing WAN Communications Quiz
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Questions and Answers

What is the main advantage of Voice over frame relay (VoFR) according to the summary?

  • Low cost of long-distance communication (correct)
  • Improved fault tolerance
  • High-speed data transfer
  • Enhanced security features

    • Which technology offers speeds up to 40 Gbps, as mentioned in the text?

  • ISDN
  • SONET
  • SMDS
  • ATM (correct)

    • What distinguishes DSL downstream speed from upstream speed based on the provided information?

  • Upstream speed is not affected by DSL technology
  • Both downstream and upstream speeds are the same
  • Downstream speed is slower than upstream speed
  • Downstream speed is greater than upstream speed (correct)

    • Which WAN technology employs high-speed bus bandwidth up to 155 Mbps?

    <p>SMDS</p> Signup and view all the answers

    What is the transmission speed reached by X.25 protocol based on packet switching?

    <p>2.048 Mbps</p> Signup and view all the answers

    What does SONET offer as a fiber-optic solution according to the information provided?

    <p>High speeds up to 9.953 Gbps</p> Signup and view all the answers

    Which technology is DSL a strong competitor to?

    <p>ISDN</p> Signup and view all the answers

    What is the main transport method for SONET?

    <p>Fiber-optic cable</p> Signup and view all the answers

    Which SONET transmission speed is designated by the code OC-48?

    <p>9953.28 Mbps</p> Signup and view all the answers

    In SONET, what does the Layer 2 (Section Layer) primarily do?

    <p>Encapsulate data, sequences, and time frames</p> Signup and view all the answers

    What network architecture uses a dual-ring topology for redundancy?

    <p>Ring topology</p> Signup and view all the answers

    Which technology is a high-speed alternative to SONET and frame relay?

    <p>Ethernet</p> Signup and view all the answers

    What type of cable connections can Ethernet backbone networks consist of?

    <p>Single-mode fiber-optic cable connections up to 43.4 miles</p> Signup and view all the answers

    'Bidirectional line switching' in SONET offers what percentage of redundancy?

    <p>~99%</p> Signup and view all the answers

    Which layer in the SONET model corresponds to the OSI model's Physical layer?

    <p>Photonic layer (bottom)</p> Signup and view all the answers

    What does SDH stand for?

    <p>Synchronous Digital Hierarchy</p> Signup and view all the answers

    What is one of the reasons for the popularity of X.25 networks?

    <p>Provision of worldwide connectivity between LANs</p> Signup and view all the answers

    How does Frame Relay differ from X.25 networks?

    <p>Frame Relay uses FRAD and is connection-oriented.</p> Signup and view all the answers

    Which technology is NOT mentioned as a replacement for X.25 networks?

    <p>ATM (Asynchronous Transfer Mode)</p> Signup and view all the answers

    What is a characteristic of Voice over Frame Relay (VoFR)?

    <p>Utilizes PCM, ADPCM, and SB-ADPCM for audio creation.</p> Signup and view all the answers

    What type of connection does Committed Information Rate (CIR) offer?

    <p>Pledged minimum transmission rate.</p> Signup and view all the answers

    Which service is NOT offered by frame relay service providers?

    <p>Integrated Services Digital Network (ISDN)</p> Signup and view all the answers

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