block 5 test .3.txt

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    • author "me"
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    • fileName "block 5 test .3"
    • what does CRC stand for
    • cyclic redundancy check
  1. what does FCS stand for
    frame check sequence
  2. what are the two basic types of layer 3 switching
    • packet-by-packet routing
    • flow-based routing
  3. what is a high performance implementation of standard routing functions
    packet-by-packet routing
  4. what is a proprietary implementation that relies on short-cutting the router function when forwarding packets over the network
    flow-based routing
  5. what does EIGRP stand for
    enhanced interior gateway routing protocol
  6. In EIGRP hello packet are sent as multicast to what IP address
  7. hello multicast message are sent how fast
    every 5 seconds
  8. hello packets that are sent unicast are sent how fast
    every 60 seconds
  9. what does OSPF stand for
    open shortest path first
  10. a RIP network that spans more than how many hops is considered unreachable
    15 hops
  11. RIP broadcasts full routing tables to all neighbors every (how many seconds) ____, which is especially problematic over slow WAN links
    30 seconds
  12. OSPF hello packets are sent to what IP address
  13. what does ABR stand for
    area border router
  14. what are the most commonly used signaling protocols
    • H.323- session intiation protocol (SIP)
    • H.248- media gateway control protocol (MGCP)
  15. what does SIP stand for
    session initiation protocol
  16. what does MGCP stand for
    media gateway control protocol
  17. what does SBC stand for
    session border controllers
  18. what does CoS stand for
    class of service
  19. what is supporting VoIP services with a Best-effort network
    • a best-effort network provides just what its name describes- a network that does its best to deliver packets in a timely manner
    • it is the least complex and costly network approach and is the design most networks use today
    • best-effort networks leverage interior gateway protocol (IGP) technologies such as open shortest path first(OSPF) and intermediate system to intermediate system (IS-IS) to determine paths fo routing packets between hosts
  20. supporting VoIP with differentiated services network
    • some service providers enhance the best-effort approach by adding differentiated services capabilities, to optimize resources for traffic of varying bandwitch and criticality running simultaneously on their networks
    • differentiated service adds state information to each packet, allowing the router to identify different service flows and direct queuing and forwarding treatment appropriate to the service requirements
  21. service providers commonly define two service classes to handle what
    • bearer (audio)
    • signaling traffic in the VoIP solutions
  22. what is supporting VoIP solutions with traffic-engineered MPLS
    • MPLS is widely recognized as the most modern approach to providing the network functionality required by VoIP and other real-time applications
    • MPLS defines label-switched paths, which are simple uni-directional forwarding paths constructed by wrapping ATM, IP, and other transport protocols packets in MPLS frames
  23. what is an important benefit of the label-swapping forwarding algorithm
    is its ability to take any type of user traffic, associate it with an FEC, and map the FEC to an LSP that has been specifically designed to satisfy the FEC's requirements
  24. what does PoE stand for
    power over ethernet
  25. what is the ability for the LAN switching infrastructure to provide power over a copper ethernet cable to an endpoint or "powered device"
    PoE (power over ethernet)
  26. what IEEE standard does Poe utilize
  27. what does ARPANET stand for
    advanced research project agency network
  28. what does DARPA stand for
    defense advanced research project agency
  29. what is the juncture at which the CPE ends and the local loop portion of the service begins often occurs at a telecommunication closet
    demarcation (demarc)
  30. what are the three most common WAN connectivity options available
    • leased line
    • packet-switched
    • circuit-switched
  31. what is also referred to as point-to-point or dedicated connections and provides a single, pre-established WAN communications path from the customer premises, through a service provider network, to remote network
    leased line
  32. what is WAN switching method in which network devices share a single point-to-point link to transport packets from a source to a destination across a carrier network and uses virtual circuits (VC) that provide end-to-end conectivity
    packet switching
  33. what does VC stand for
    virtual circuits
  34. what does ISDN stand for
    integrated services digital network
  35. what is used by the service provider network when providing basic telephone service or integrated services digital network (ISDN)
    circuit switching
  36. what is the bandwidth of analog modem
    up to 56 Kbps
  37. what is the bandwidth of ISDN PRI
    1.544 Mbps
  38. what is the bandwidth of T-1 (DS-1)
    1.544 Mbps
  39. what does HDLC stand for
    high-level data link control
  40. what is an ISO standard bit-oriented data-link protocol that encapsulates data on synchronous serial data links
    HDLC (high-level data link control)
  41. what does PPP stand for
    point-to-point protocol
  42. what provides a router-to-router and host-to-network connections over synchronous and asynchronous circuits
    PPP (point-to-point protocol)
  43. what does DTE stand for
    data terminal equipment
  44. what are the benefits of ISDN to the local site
    • ability to carry a variety of user-traffic feeds
    • fast call setup taht is usually less than 1 second
    • fast data transfer rate that uses bearer (B) channel services at 64 Kbps per channel
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block 5 test .3.txt
2014-06-15 15:52:03

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