Understanding IP Addresses and Subnets

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Questions and Answers

An IP address of 14.23.120.8 belongs to which class?

  • Class B
  • Class A (correct)
  • Class D
  • Class E

Addresses of classes A, B, and C are primarily used for what type of communication?

  • Broadcast
  • Unicast (correct)
  • Multicast
  • Reserved

Class C IP address ranges fall between which numerical values?

  • 192 to 223 (correct)
  • 129 to 191
  • 0 to 127
  • 224 to 239

In a Class A IP address, what are the sizes of the network and host bits, respectively?

<p>Network bits 8, Host bits 24 (A)</p>
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What are the sizes of network and host bits in a Class B IP address?

<p>Network bit – 16, Host bit – 16 (B)</p>
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Which statement accurately reflects the concept of Classless Inter-Domain Routing (CIDR)?

<p>There is no concept of class A, B, C networks (B)</p>
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With a subnet mask of 255.255.255.224, what is the maximum number of IP addresses that can be assigned to hosts on a local subnet?

<p>30 (A)</p>
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A router interface is configured with the IP address 192.168.192.10/29. How many hosts, including the router interface, can have IP addresses on the attached LAN?

<p>6 (C)</p>
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What is the maximum number of assignable IP addresses for hosts on a local subnet using the subnet mask 255.255.255.252?

<p>2 (D)</p>
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Which IP address is used to test the IP stack on a local host?

<p>127.0.0.1 (A)</p>
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What is the default subnet mask for a Class B network?

<p>255.255.0.0 (D)</p>
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What is the dotted-decimal notation of the binary IP address 10111110.10101100.00001011.11111000?

<p>190.172.11.248 (A)</p>
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If an IP address of 223.123.75.142/28 is assigned, what is the subnet mask in dotted decimal notation?

<p>255.255.255.240 (D)</p>
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Which of the following IP addresses is a private IP address?

<p>172.16.0.0 (C)</p>
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What is the purpose of subnetting a network?

<p>All of the above (D)</p>
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What is the block size of a /27 subnet?

<p>32 (B)</p>
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Which of the following is a valid host address on the 192.168.1.0/24 network?

<p>192.168.1.1 (D)</p>
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What is the primary function of a default gateway?

<p>To route traffic to destinations outside the local network (D)</p>
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What is the maximum number of usable hosts in a /23 subnet?

<p>510 (D)</p>
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Which of the following is a routable IP address on the public internet?

<p>203.0.113.45 (C)</p>
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Flashcards

Class B IP Address Range

Class B IP addresses range from 128.0.0.0 to 191.255.255.255.

Class C IP Address Range

Class C IP addresses range from 192.0.0.0 to 223.255.255.255.

Unicast Address

Unicast addresses are for one-to-one communication to a specific destination.

Class A Network/Host Bits

Class A IP addresses have 7 network bits and 24 host bits.

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Class B Network/Host Bits

Class B IP addresses have 16 network bits and 16 host bits.

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CIDR

CIDR eliminates the concept of traditional network classes (A, B, C) by using a prefix to define the network portion of an IP address.

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/27 Subnet Usable Hosts

A /27 subnet mask (255.255.255.224) allows for 30 usable host addresses.

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/29 Subnet Usable Hosts

A /29 subnet mask allows for 6 usable host addresses. (2^3 - 2)

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/30 Subnet Usable Hosts

A /30 subnet mask (255.255.255.252) provides 2 usable host addresses.

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Loopback Address

127.0.0.1 is the loopback address used to test the IP stack on a local host.

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Class B Default Subnet Mask

The default subnet mask for a Class B network is 255.255.0.0.

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Binary to Dotted Decimal

The dotted-decimal notation of 10111110.10101100.00001011.11111000 is 190.172.11.248.

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/28 Subnet Mask

A /28 subnet mask is 255.255.255.240

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Study Notes

  • The IP address 14.23.120.8 belongs to class A.
  • Class A, B, and C addresses are Unicast.
  • Class C IP addresses range from 192 to 223.
  • Class A IP addresses have 7 network bits and 24 host bits.
  • Class B IP addresses have 16 network bits and 16 host bits.
  • CIDR (Classless Inter-Domain Routing) eliminates the concept of class A, B, and C networks.
  • With a subnet mask of 255.255.255.224, a local subnet can assign a maximum of 30 IP addresses to hosts.
  • An interface on a router with the IP address of 192.168.192.10/29 allows for 6 hosts to have IP addresses on the attached LAN, including the router interface.
  • A subnet mask of 255.255.255.252 can assign a maximum of 2 IP addresses to hosts on a local subnet.
  • The IP address 127.0.0.1 is used to test the IP stack on a local host using ping.
  • The default network mask for CLASS B is 255.255.0.0.
  • The dotted-decimal notation of the binary address 10111110.10101100.00001011.11111000 is 190.172.11.248.
  • An IP Address of 223.123.75.142/28 has a subnet mask of 255.255.255.240.

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