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  • Question

  • If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what would be the valid subnet address of this host?


  • Options
  • A. 172.16.112.0
  • B. 172.16.0.0
  • C. 172.16.96.0
  • D. 172.16.255.0

  • Correct Answer
  • 172.16.112.0 

    Explanation
    A /25 mask is 255.255.255.128. Used with a Class B network, the third and fourth octets are used for subnetting with a total of 9 subnet bits, 8 bits in the third octet and 1 bit in the fourth octet. Since there is only 1 bit in the fourth octet, the bit is either off or on-which is a value of 0 or 128. The host in the question is in the 0 subnet, which has a broadcast address of 127 since 128 is the next subnet.

    • Subnetting problems

    Search Results

    • 1. You need to configure a server that is on the subnet 192.168.19.24/29. The router has the first available host address. Which of the following should you assign to the server?

    • Options
    • A. 192.168.19.0 255.255.255.0
    • B. 192.168.19.33 255.255.255.240
    • C. 192.168.19.26 255.255.255.248
    • D. 192.168.19.31 255.255.255.248
      • Discuss
    • 2. You have an interface on a router with the IP address of 192.168.192.10/29. What is the broadcast address the hosts will use on this LAN?

    • Options
    • A. 192.168.192.15
    • B. 192.168.192.31
    • C. 192.168.192.63
    • D. 192.168.192.127
      • Discuss
    • 3. You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?

    • Options
    • A. 172.16.17.1 255.255.255.252
    • B. 172.16.0.1 255.255.240.0
    • C. 172.16.20.1 255.255.254.0
    • D. 172.16.18.255 255.255.252.0
      • Discuss
    • 4. What is the subnetwork number of a host with an IP address of 172.16.66.0/21?

    • Options
    • A. 172.16.36.0
    • B. 172.16.48.0
    • C. 172.16.64.0
    • D. 172.16.0.0
      • Discuss
    • 5. 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
      • Discuss
    • 6. You have a network that needs 29 subnets while maximizing the number of host addresses available on each subnet. How many bits must you borrow from the host field to provide the correct subnet mask?

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 7. On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?

    • Options
    • A. /27
    • B. /28
    • C. /29
    • D. /30
      • Discuss
    • 8. Using the illustration from the previous question, what would be the IP address of S0 if you were using the first subnet? The network ID is 192.168.10.0/28 and you need to use the last available IP address in the range. Again, the zero subnet should not be considered valid for this question.

    • Options
    • A. 192.168.10.24
    • B. 192.168.10.62
    • C. 192.168.10.30
    • D. 192.168.10.127
      • Discuss
    • 9. If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

    • Options
    • A. 172.16.45.0
    • B. 172.16.45.4
    • C. 172.16.45.8
    • D. 172.16.45.12
      • Discuss
    • 10. A network administrator is connecting hosts A and B directly through their Ethernet interfaces, as shown in the illustration. Ping attempts between the hosts are unsuccessful. What can be done to provide connectivity between the hosts?

      1. A crossover cable should be used in place of the straight-through cable.
      2. A rollover cable should be used in place of the straight-through cable.
      3. The subnet masks should be set to 255.255.255.192.
      4. A default gateway needs to be set on each host.
      5. The subnet masks should be set to 255.255.255.0.

    • Options
    • A. 1 only
    • B. 2 only
    • C. 3 and 4 only
    • D. 1 and 5 only
    • E. 2 and 5 only
      • Discuss

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