Network+ Chapter 3

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  1. What cable standard was release in 2001.
    TIA/EIA 568-B

    Telecommunications Industry Association/Electronic Industries Alliance
  2. Why should wires be twisted and shielded when concerning networking?
    Because untwisted/unshielded cables can act as an antenna for EMI.
  3. Why is UTP preferred over STP?
    UTP is cheaper.
  4. Describe CAT 3 cabling
    Commonly used in 10base-T networks that carry data rates of 10Mbps and a maximum rate of 16Mbps.
  5. Describe CAT 5 Cabling
    Commonly used on 1000base-TX networks which carry a data rate of 100Mbps; however ATM data rates are 155Mbps.  Most CAT5 cable are 24 gauge each pair is twisted at a different number of twists per meter; however the average twist is 5cm.
  6. Describe CAT 5e
    • "e" stands for Enhanced.
    • Commonly used on 1000base-T networks that carry data rates of 1 Gbps and offers reduced cross-talk.
  7. Describe CAT 6
    Commonly used on 1000base-T networks.  Some CAT 6 are 22-23 gauge wire (thicker), also reduces cross-talk.
  8. Describe CAT 6a
    • "a" stands for Augmented.
    • Supports twice as many frequencies as CAT 6 and used for 10Gbase-T network which transmits data at a rate of 10 billion bits per second (10Gbps).
  9. What is SMF and MMF
    • Single Mode Fiber
    • Multi Mode Fiber
  10. What is the wavelength distance for MMF and SMF
    • MMF is 850-1300nm
    • SMF is 1310-1550nm
  11. What is the name of the type of fiber that is referred to as bayonet connector
    Straight tip (ST) fiber commonly used for MMF.
  12. What are some other names for Standard connector fiber?
    SC, Square connector, subscriber connector.
  13. What is an LC fiber connector?
    Lucent Connector
  14. What type of fiber has transmit and receive strands included in a single connector?
    Media Termination Recommended Jack (MTRJ).
  15. What are 66 block used for?
    Traditionally, corporate environments for cross-connecting phone system cabling.  Doesn't support higher LAN speeds like 100Mbps.
  16. What are 110 block used for?
    Used to terminate a cable and supports higher speed LANs.
  17. What layer does a hub reside in?
    Layer 1 (Physical layer)
  18. What is the main difference between a bridge and a switch?
    A bridge is software based and a switch is hardware based.
  19. What type of coaxial cable was often used for 10BASE2 Ethernet networks?
    A. RG-45
    B. RG-58
    C. RG-6
    D. RG=59
    B. RG-58
    (this multiple choice question has been scrambled)
  20. Which of the following categories of UTP cabling are commonly used for 1000BASE-T networks? (Choose two.)
    a. Cat 5
    b. Cat 5e
    c. Cat 6
    d. Cat 6e
    • b. Cat 5e
    • c. Cat 6
  21. Which type of cable might be required for installation in a drop ceiling, which is used as an open air return duct?
    A. Plenum
    B. Riser
    C. Twin-axial
    D. Multimode
    A. Plenum
    (this multiple choice question has been scrambled)
  22. Which network infrastructure device primarily makes forwarding decisions based on MAC addresses?
    A. Router
    B. Multilayer switch
    C. Switch
    D. Hub
    C. Switch
    (this multiple choice question has been scrambled)
  23. A router primarily makes its forwarding decisions based on what address?
    A. Source MAC address
    B. Source IP address
    C. Destination IP address
    D. Destination MAC address
    C. Destination IP address
    (this multiple choice question has been scrambled)
  24. Identify two differences between an Ethernet bridge and an Ethernet switch. (Choose two.)
    a. Switches use ASICs to make forwarding decisions, while bridges make their forwarding decisions in software.
    b. Bridges typically operate faster than switches.
    c. Switches typically have higher port densities than bridges.
    d. Bridges can base their forwarding decisions on logical network layer addresses.
    • a. Switches use ASICs to make forwarding decisions, while bridges make their forwarding decisions in software
    • c. Switches typically have higher port densities than bridges.
  25. A router has 12 ports. How many broadcast domains does the router have?
    A. Twelve
    B. Two
    C. None
    D. One
    A. Twelve
    (this multiple choice question has been scrambled)
  26. A switch has 12 ports. How many collision domains does the switch have?
    A. None
    B. Two
    C. One
    D. Twelve
    D. Twelve
    (this multiple choice question has been scrambled)
  27. What is the first DHCP message sent by a client attempting to obtain IP address information from a DHCP server?
    A. DHCPREQUEST
    B. DHCPDISCOVER
    C. DHCPACK
    D. DHCPOFFER
    B. DHCPDISCOVER
    (this multiple choice question has been scrambled)
  28. What specialized network device is commonly used to load balance traffic across multiple servers in a group?
    A. Content switch
    B. Content engine
    C. Proxy server
    D. DNS server
    C. Proxy server
    (this multiple choice question has been scrambled)
  29. Which of the following is a VoIP signaling protocol used to set up, maintain, and tear down VoIP phone calls?

    A. MX
    B. IMAP
    C. SIP
    D. RJ-45
    C. SIP
    (this multiple choice question has been scrambled)
  30. Which of the following categories of UTP cabling are commonly used for 1000BASE-T networks? (Choose two.)

    a. Cat 5
    b. Cat 5e
    c. Cat 6
    d. Cat 6f
    • b. Cat 5e
    • c. Cat 6
  31. Which type of cable might be required for installation in a drop ceiling, which is used as an open-air return duct?

    A. Riser
    B. Plenum
    C. Multimode
    D. Twin-axial
    B. Plenum
    (this multiple choice question has been scrambled)
  32. Which network infrastructure device primarily makes forwarding decisions based on Layer 2 MAC addresses?

    A. Switch
    B. Hub
    C. Router
    D. Multilayer switch
    A. Switch
    (this multiple choice question has been scrambled)
  33. A router operating at Layer 3 primarily makes its forwarding decisions based on what address?

    A. Destination MAC address
    B. Source IP address
    C. Destination IP address
    D. Source MAC address
    C. Destination IP address
    (this multiple choice question has been scrambled)
  34. Identify two differences between an Ethernet bridge and an Ethernet switch.

    a. Switches use ASICs to make forwarding decisions, whereas bridges make their forwarding decisions in software.
    b. Bridges typically operate faster than switches.
    c. Switches usually have higher port densities than bridges.
    d. Bridges can base their forwarding decisions on logical network layer addresses.
    • a. Switches use ASICs to make forwarding decisions, whereas bridges make their forwarding decisions in software
    • c. Switches usually have higher port densities than bridges.
  35. A router has 12 ports. How many broadcast domains does the router have?

    A. 2
    B. None
    C. 1
    D. 12
    D. 12
    (this multiple choice question has been scrambled)
  36. A switch has 12 ports. How many collision domains does the switch have?

    A. 12
    B. 2
    C. None
    D. 1
    A. 12
    (this multiple choice question has been scrambled)
  37. What is the first DHCP message sent by a client attempting to obtain IP address information from a DHCP server?

    A. DHCPREQUEST
    B. DHCPDISCOVER
    C. DHCPOFFER
    D. DHCPACK
    B. DHCPDISCOVER
    (this multiple choice question has been scrambled)
  38. What specialized network device is commonly used to load balance traffic across multiple servers in a group?

    A. Content engine
    B. Firewall
    C. DNS server
    D. Content switch
    D. Content switch
    (this multiple choice question has been scrambled)
  39. What is a benefit of using coaxial cable?
    Because the inner conductor is shielded by metallic outer conductor, coax cable are resistant to electro magnetic interference (EMI).
  40. What are three of the most common types of coaxial cables?
    RG-59 - Used for short distances like composite video cable.

    RG-6 - Commonly used by local cable companies to connect homes to cable company's distribution network.

    RG-58 - Similar to RG-59 but has 50 ohm impedance.  Commonly used with early 10BASE2 Ethernet network.
  41. What does RG stand for in RG-59
    Radio guide
  42. What are typical connectors used on coaxial cables?
    BNC (Bayonet Nell-Concelman or British Naval-Connector).

    F-Connector.
  43. What is the wiring pattern for Ethernet crossover cable?
    • 1 --> 3
    • 2 --> 6
    • 3 --> 1
    • 6 --> 2
  44. What is the wiring pattern for T1 crossover cable?
    • 1 --> 4
    • 2 --> 5
    • 4 --> 1
    • 5 --> 2
  45. What is the pin mapping for a rollover cable?
    • 1 <--> 8
    • 2 <--> 7
    • 3 <--> 6
    • 4 <--> 5
  46. What type of port is traditionally found on a PCs NIC?
    Media dependent interface (MDI) which accepts a straight through CAT5 cable and swaps transmit wires 3 and 6.
  47. What type of port is traditionally found on a switch?
    Media dependent interface crossover (MDIX) which can autodetect whether it needs to act as a MDI or MDIX, so it will accept a straight-through or crossover cable.
  48. What type of connector is this?

    Image Upload 1
    Straight tip (ST) connector
  49. What type of connectors are shown here?

    Image Upload 2
    • Lucent connector (LC) beige connector
    • Media termination recommended jack (MT-RJ) black connector
  50. What time of connection is this?

    Image Upload 3
    Subscriber connector or Standard connector or Square connector (SC) connector.
  51. What are the three basic type hubs?
    • Passive hub - does not amplify received bits
    • Active hub - Regenerates incoming bits as they are sent out all ports other than the port which it was received.
    • Smart hub - Active hub with enhanced features such as Simple Network Management Protocol (SNMP) support.
  52. A bridge makes forwarding decisions based on what layer information?
    Layer 2
  53. What type of technology uses radio waves to connect with an unwired access point?
    Wireless topology
  54. Although a bridge segments a LAN into multiple collision domains, all of the ports on a bridge belong to what?
    The same broadcast domain
  55. Explain the step in how the SW populate its MAC address table when it was previously empty?


    Image Upload 4
    Initially, when the SW receives a frame destined for a MAC address that isn't held, the switch floods the frame out all ports except the port from which it came (similar to what a passive hub does with received bits).  When PC1 sends an ARP out G0/1 destined for PC2 the ARP is flooded out all SW ports.

    Image Upload 5
  56. For a switch to populate its MAC table and it has initially received a frame when its table is empty and PC1 (for example) has sent an ARP request out G0/1 and an ARP has been sent and that ARP has been flooded out G0/1.  What happens next?
    SW2 floods the ARP request out all ports except the port where it oriImage Upload 6 ginated.
  57. After a destined SW receives an ARP and floods it out of its ports except for the originating port.  What then happens?
    The ARP request is received by the distant end server and the server sends an ARP reply frame, but it is not BCST'd.


    Image Upload 7
  58. Once the SRVR sends an ARP reply frame, what happens.

    Image Upload 8
    The ARP reply goes out SW2 G0/1 because it knows this is where the initial request originated.  It then populates its SW2's table with PC2 MAC address.


    Image Upload 9
  59. When SW2 sends PC2's ARP reply out, what happens when SW1 receives the ARP reply?


    Image Upload 10
    SW1 now has PC2 MAC address and it populates its MAC table with this information and forwards the MAC address out G0/1 to PC1.


    Image Upload 11
  60. What does ARP stand for?
    Address Resolution Protocol (ARP).
  61. Each port of a SW represents a collision domain, every SW belongs to a BCST domain. with one exception.  What is this except?
    When a (collision domain) port is divided into VLANs, where each VLAN represents a separate BCST domain.  Each port, when used as a VLAN, effectively becomes its own switch.
  62. When a SW is using its ports in a VLAN, is traffic still routed using Layer 2 technology?

    A. Yes
    B. No
    B.  No - For traffic to travel from one VLAN to another, routing through a Layer 3 device is required.
  63. What is another name for a multilayer switch?
    Layer 3 switch
  64. What can a multilayer switch do with BCST domains that a regular switch cannot?
    A multilayer switch can configure all ports to belong to a different BCST domain; whereas, with a Layer 2 switch, all ports belong to the same BCST domain.
  65. How are ports in a router viewed?
    Each port in a router is considered a collision domain and a separate BCST domain.
  66. How many BCST and collision domains are in this diagram?

    Image Upload 12
    • 8 Collision domains
    • 2 BCST domains

    Image Upload 13
  67. A firewall is considered a Layer 2 devices.

    A. True
    B. False
    B. False - A firewall is considered a network security appliance.
  68. What is a VPN concentrator?
    It can terminate multiple VPN connections.
  69. Describe the common DNS records.
    • A - An address record that maps to a IPv4 address hostname.
    • AAAA - An address record that maps to a IPv6 address host.
    • CNAME - Canonical name is an alias of an existing record which allows multiple DNS records to be mapped to the same IP address.
    • MX - Mail exchange record maps a domain name to an email server for that domain.
    • PTR - Pointer record identifies a canonical name.  Commonly used when performing reverse DNS lookup.
    • SOA - Start of authority record provides authoritative information about a DNS zone, such as email contact information, primary server name, refresh timers.
  70. What does a DHCPDISCOVER do?
    It sends a BCST out to locate a DHCP server.
  71. Once a DHCPDISCOVER has been received, what happens next?
    The DHCP server sends a DHCPOFFER.
  72. Which step is followed once a DHCPOFFER has been sent?

    A. DHCPDISCOVER
    B. DHCPREQUEST
    C. DHCPACK
    D. DHCPACCEPT
    B. DHCPREQUEST
    (this multiple choice question has been scrambled)
  73. What is the last step in the DHCP IP obtainment process?

    A. DHCPACCEPT
    B. DHCPFINISH
    C. DHCPACK
    D. DHCPRECEIPT
    C. DHCPACK
    (this multiple choice question has been scrambled)
  74. How is a DHCP request handled if it is made from another network?
    The request is framed as a DHCP relay agent which can be processed by a router to a unicast or BCST address.
  75. What is a mnemonic for remembering the main step for DHCP?
    D.O.R.A
  76. What is a benefit of using a proxy server? (select three

    A. BCSTs the network's address
    B. Saves bandwidth
    C. Security
    D. Content caching
    • B. Saves bandwidth
    • C. Security
    • D. Content caching
  77. What is another name for a device like the proxy server that provides content caching but is dedicated to the service?
    Content engines or caching engines
  78. What is a common name for a content switch and what is its purpose?
    Load balancer distributes incoming requests across various servers in a server farm.  Good for search engine companies, bookstores (online), social network companies.
  79. What are a couple benefits of a content switch?
    • It allows an organization to scale its network.
    • A server can be removed for service and a content switch will redistribute its workload over the remaining servers.
  80. Which of the following Cooper connector types is most commonly used for cable TV connections?

    A) F-connector
    B) DB-9
    C) RJ-11
    D) BNC
    A) F-connector
    (this multiple choice question has been scrambled)
  81. What is the primary difference between the TIA/EIA-568-A and TIA/EIA-568-B wiring standards?

    A) The color coding
    B) the distance
    C) the pinout
    D) the speed
    A) The color coding
    (this multiple choice question has been scrambled)
  82. Consider the topology. What needs to be configured on router R1 in order for the DHCP client to successfully send a DHCPDISCOVER message to the DHCP server?

    Image Upload 14

    A) DHCP relay agent
    B) Reservation
    C) Lease
    D) Scope
    A) DHCP relay agent
    (this multiple choice question has been scrambled)
  83. What is the name of the wireless communications protocol used primarily for home automation?

    A) Z-Wave
    B) Bluetooth
    C) Ant+
    D) IR
    A) Z-Wave
    (this multiple choice question has been scrambled)
  84. What is the minimum category of unshielded twisted pair (UTP) cable that can be used for 10GBASE-T networks that must support 100M cable lengths?

    A) Category 5e
    B) Category 6
    C) Category 6a
    D) Category 5
    C) Category 6a
    (this multiple choice question has been scrambled)
  85. Which of the following standards specifies a type of coaxial cable commonly used by local cable companies to connect individual homes to the cable company's distribution network?

    A) SMF
    B) RG-6
    C) RG-58
    D) MMF
    B) RG-6
    (this multiple choice question has been scrambled)
  86. A building might have multiple patch panels (for example, on different floors of a building). These common locations, where cables from nearby office home back to, are often called what?

    A) access points
    B) intermediate distribution frames
    C) multi station access units
    D) central offices
    B) intermediate distribution frames
    (this multiple choice question has been scrambled)
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318027
Card Set
Network+ Chapter 3
Description
Cabling types
Updated
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