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Home Networking Subnetting See What Others Are Saying!
  • Question
  • Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?


  • Options
  • A. Router(config)#ip classless
  • B. Router(config)#no ip classful
  • C. Router(config)#ip unnumbered
  • D. Router(config)#ip subnet-zero

  • Correct Answer
  • Router(config)#ip subnet-zero 

    Explanation
    A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.

  • More questions

    • 1. What does the command o/r 0x2142 provide?

    • Options
    • A. It is used to restart the router.
    • B. It is used to bypass the configuration in NVRAM.
    • C. It is used to enter ROM Monitor mode.
    • D. It is used to view the lost password.
    • Discuss
    • 2. The configuration register setting of 0x2102 provides what function to a router?

    • Options
    • A. Tells the router to boot into ROM monitor mode
    • B. Provides password recovery
    • C. Tells the router to look in NVRAM for the boot sequence
    • D. Boots the IOS from a TFTP server
    • Discuss
    • 3. What is the purpose of flow control?

    • Options
    • A. To ensure that data is retransmitted if an acknowledgment is not received.
    • B. To reassemble segments in the correct order at the destination device.
    • C. To provide a means for the receiver to govern the amount of data sent by the sender.
    • D. To regulate the size of each segment.
    • Discuss
    • 4. Which three commands can be used to check LAN connectivity problems on a router?

      1. show interfaces
      2. show ip route
      3. tracert
      4. ping
      5. dns lookups

    • Options
    • A. 1 ,2 and 4
    • B. 2 and 5
    • C. 3 and 5
    • D. None of the above
    • Discuss
    • 5. Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

    • Options
    • A. Switch(config)# switchport trunk encapsulation isl
    • B. Switch(config)# switchport trunk encapsulation ietf
    • C. Switch(config)# switchport trunk encapsulation dot1q
    • D. Switch(config-if)# switchport trunk encapsulation isl
    • E. Switch(config-if)# switchport trunk encapsulation dot1q
    • Discuss
    • 6. To test the IP stack on your local host, which IP address would you ping?

    • Options
    • A. 127.0.0.0
    • B. 1.0.0.127
    • C. 127.0.0.1
    • D. 127.0.0.255
    • Discuss
    • 7. Which command is used to determine if an IP access list is enabled on a particular interface?

    • Options
    • A. show access-lists
    • B. show interface
    • C. show ip interface
    • D. show interface access-lists
    • Discuss
    • 8. Which command would you use to apply an access list to a router interface?

    • Options
    • A. ip access-list 101 out
    • B. access-list ip 101 in
    • C. ip access-group 101 in
    • D. access-group ip 101 in
    • Discuss
    • 9. Which of the following are true regarding OSPF areas?

      1. You must have separate loopback interfaces configured in each area.
      2. The numbers you can assign an area go up to 65,535.
      3. The backbone area is also called area 0.
      4. If your design is hierarchical, then you don't need multiple areas.
      5. All areas must connect to area 0.

    • Options
    • A. 1 only
    • B. 1 and 2 only
    • C. 3 and 4 only
    • D. 3, 4 and 5
    • Discuss
    • 10. Which command displays RIP routing updates?

    • Options
    • A. show ip route
    • B. debug ip rip
    • C. show protocols
    • D. debug ip route
    • Discuss


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