TCP/IP Basics Questions And Answers

1.Which decimal number is represented by the binary number 1 0 1 1 0 1 1 0?

  • 73


  • 176

  • 182


    1 0 1 1 0 1 1 0 has 1s in the 128, 32, 16, 4 and 2 position. Add those together to arrive at 182.

2. What does ARP stand for and what does it do?

  • Advanced Routing Protocol determines routes between MAC addresses.

  • Advanced Resolution Protocol resolves network names to IP addresses.

  • Alternate Routing Protocol determines backup routes between MAC addresses.

  • Address Resolution Protocol resolves MAC addresses with IP addresses.


    Address Resolution Protocol learns MAC addresses by listening to broadcasts and by broadcasting requests on the local network.

3. Which statement is not true of a subnet mask?

  • Subnet masks are used by a computer to determine the network ID.

  • Subnet masks are never sent out of a host.

  • Subnet masks are sent out as one of the fields in the IP packet.


    Subnet masks are never sent out of a host.

  • Subnet masks are made up of contiguous 1s starting at the leftmost (most significant bit) of an IP address.

4. Here are three IP addresses:,, What class of addresses are each one (in order)?

  • A, C, A

  • C, B, C


    The first octet of a Class A address goes from 1 to 126. The first octet of a Class B address goes from 128 to 191. The first octet of a Class C address goes from 192 to 223.

  • B, A, C

  • C, A, B

5. An organization wants each of five buildings to be on its own subnet. Each campus will need a minimum of 25 IP addresses. The organization has the Class C network address 217.105. 2.0 assigned to it. Using CIDR, what subnet mask will the minimum number of subnetworks with the maximum number of hosts per network that will meet the requirements of the organization?

  • /28

  • /29

  • /26

  • /27


    /27 will result in 6 subnetworks with 30 hosts per subnet.

6. A company has subnetted their Class C network address into four subnets with a /26 subnet mask. What are the addresses of the four subnets?

  • 128, 64, 32, 16

  • 1, 2, 4, 8

  • 0, 64, 128, 192


    0, 64, 128, and 192 represent all of the possible values of 1s and 0s in the first two columns of the fourth octet in a Class C address: 0 0, 0 1, 1 0, and 1 1. Place those values under a 128 and a 64 and calculate the results. 00=0 01=64 10=128 11=192

  • 0, 1, 2, 3

7. Which service does not automatically assign an IP address to a host?


  • Static


    Static IP addressing sets a constant, unchanging IP address to a host.

  • bootp

  • DHCP

8. Which choice is true of a rogue DHCP server?

  • A rogue DHCP server increases the speed of the DHCP service.

  • A rogue DHCP server increases the pool of available IP addresses.

  • A rogue DHCP server ensures that hosts will get compatible APIPA addresses.

  • A rogue DHCP server can assign incompatible IP addresses to hosts.


    Rogue DHCP servers can assign incompatible IP addresses to hosts on a network, making them unable to communicate with other hosts or the Internet.

9. Which of the following is not a "special" IP address?





    Correct is a valid class B address (note, any address that starts with 169.245 is an Automatic Private IP Address - APIPA).

10. Which symptom is not a result of an IP addressing problem?

  • Static IP address


    There is nothing wrong with assigning static IP addresses so long as the rules of assigning addresses are followed.

  • Incorrect gateway

  • Duplicate MAC addresses

  • Duplicate IP address