CCNP Switching Study Guide: Power over Ethernet (PoE)
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Questions and Answers

What type of cable is often referred to as a patch cable?

  • Crossover cable
  • Straight-through cable (correct)
  • Ethernet cable
  • Twisted-pair cable

    • In which situation would you use a crossover cable according to the text?

  • From a router to a router
  • From a host to a host (correct)
  • From a hub to a switch
  • From a switch to a hub

    • What does MDIX stand for when referring to cable connections?

  • Media Dependent Interface Crossover (correct)
  • Medium Duplex Interface X-cross
  • Medium Dependent Interface X-over
  • Modulated Data Interface X-link

    • Which device provides the crossover function when connecting two switches together?

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

    How many wires are typically twisted together in twisted-pair cabling?

    <p>8 wires</p> Signup and view all the answers

    What is the main difference between a straight-through cable and a crossover cable?

    <p>Usage scenarios</p> Signup and view all the answers

    What is the primary function of a switch in a network?

    <p>Forward packets between devices based on MAC addresses</p> Signup and view all the answers

    Which switching technology provides fault tolerance and increased bandwidth by combining multiple physical links into one logical link?

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

    Which protocol is used to prevent loops in layer 2 networks by dynamically shutting down redundant links?

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

    In a switch, what table is used to make forwarding decisions by mapping MAC addresses to port numbers?

    <p>Switching table</p> Signup and view all the answers

    What is a key feature of VLANs in networking?

    <p>They create multiple broadcast domains within a single switch</p> Signup and view all the answers

    Which QoS mechanism prioritizes network traffic by assigning different levels of importance to different types of data?

    <p>Classification and Marking</p> Signup and view all the answers

    What is the purpose of Power over Ethernet (PoE)?

    <p>To eliminate the need for separate power connections by sending both data and power across the same cable</p> Signup and view all the answers

    What is a key difference between Layer-3 switches and routers?

    <p>Layer-3 switches are optimized for Ethernet, while routers support a large number of WAN technologies.</p> Signup and view all the answers

    In which scenarios is Power over Ethernet (PoE) particularly useful?

    <p>In places where providing separate power might be expensive or difficult</p> Signup and view all the answers

    Which standard formalized Power over Ethernet (PoE) and initially provided roughly 13W of power to a device?

    <p>802.3af</p> Signup and view all the answers

    In what environments are Layer-3 switches often deployed?

    <p>As the backbone of LAN or campus networks</p> Signup and view all the answers

    What is the enhanced Power over Ethernet (PoE) standard that supports 25W or more power to a device?

    <p>802.3at</p> Signup and view all the answers

    What is a characteristic of routers that distinguishes them from Layer-3 switches?

    <p>Support for more WAN technologies</p> Signup and view all the answers

    Why are Layer-3 switches considered to be considerably cheaper per port than routers?

    <p>Higher port densities on Layer-3 switches</p> Signup and view all the answers

    Why does Gigabit Ethernet require the phantom power method in Power over Ethernet (PoE)?

    <p>Because it uses all eight wires in a twisted-pair cable</p> Signup and view all the answers

    What is the device that provides power in a Power over Ethernet (PoE) setup called?

    <p>Power Source Equipment (PSE)</p> Signup and view all the answers

    Which statement is true about the functionality provided by Layer-3 switches?

    <p>Layer-3 switches generally provide Layer-2 functionality for intra-VLAN traffic.</p> Signup and view all the answers

    Where are routers predominantly used in a network setup?

    <p>On network perimeters, connecting to WAN environments</p> Signup and view all the answers

    What does the 't' in IOS version numbers stand for?

    <p>Train identifier</p> Signup and view all the answers

    If an IOS version is 15.1(4)t, what does the '4' represent?

    <p>Individual release number</p> Signup and view all the answers

    Which component of the command 'Router# show startup-config' indicates the specific command being executed?

    <p>startup-config</p> Signup and view all the answers

    What does the 'y' represent in an IOS version number like 10.3(2)t?

    <p>Minor revision number</p> Signup and view all the answers

    How are IOS version numbers usually formatted?

    <p>x.y(z)t</p> Signup and view all the answers

    What is the term used to refer to the combination of major and minor revision numbers in an IOS version?

    <p>Maintenance Release number</p> Signup and view all the answers

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