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Questions and Answers

What is your mask if you have a Class B network and need 29 subnets?

  • 255.255.240.0
  • 255.255.0.0
  • 255.255.255.0
  • 255.255.248.0 (correct)

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

  • 30 (correct)
  • 14
  • 16
  • 31
  • 62
  • 15

How many bits must you borrow from the host field to provide the correct subnet mask for a network that needs 29 subnets?

  • 2
  • 6
  • 5 (correct)
  • 3
  • 7
  • 4

What is the subnetwork address for a host with the IP address 200.10.5.68/28?

<p>200.10.5.64 (B)</p> Signup and view all the answers

The network address of 172.16.0.0/19 provides how many subnets and hosts?

<p>8 subnets, 8,190 hosts each (E)</p> Signup and view all the answers

Which two statements describe the IP address 10.16.3.65/23? (Choose two.)

<p>The broadcast address of the subnet is 10.16.3.255 255.255.254.0. (A), The lowest host address in the subnet is 10.16.2.1 255.255.254.0. (B)</p> Signup and view all the answers

If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

<p>172.16.45.12 (E)</p> Signup and view all the answers

Which mask should you use on point-to-point links in order to reduce the waste of IP addresses?

<p>/30 (B)</p> Signup and view all the answers

What is the subnetwork number of a host with an IP address of 172.16.66.0/21?

<p>172.16.64.0 (A)</p> Signup and view all the answers

You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?

<p>6 (A)</p> Signup and view all the answers

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Study Notes

Subnetting Basics

  • A Class B default mask is 255.255.0.0. Adjusting masks can help create more subnets.
  • A 255.255.255.240 mask enables 16 subnets (each with 14 hosts), but 5 bits yield 32 subnets with a /21 mask.
  • The maximum number of IPs with a 255.255.255.224 mask is 30 hosts due to its /27 subnetting.

Host and Subnet Calculations

  • For a network needing 29 subnets, borrowing 5 bits from the host field allows for a /21 subnet mask and maximizes available hosts.
  • The subnetwork address for an IP like 200.10.5.68/28 is calculated based on the block size in the fourth octet, resulting in 200.10.5.64.

CIDR Notation and Subnet Characteristics

  • A /19 CIDR gives a Class B address of 255.255.224.0, leading to 8 subnets with 8,190 hosts each due to the 3 subnet bits and 13 host bits.
  • The IP address 10.16.3.65 with a /23 mask has a subnet address of 10.16.3.0 and valid host range from 10.16.2.1 to 10.16.3.254.

Network Identifiers and Block Sizes

  • A /30 subnet mask, commonly used for point-to-point links, allows only 2 hosts, ideal for reducing IP waste.
  • The subnetwork for an IP of 172.16.45.14/30 is determined to be 172.16.45.12 due to the 252 mask specifying a block size of 4.

Router Interfaces and IP Assignments

  • With an IP of 192.168.192.10/29, only 6 hosts (including the router) can be assigned addresses in that LAN.
  • For the server configuration on 192.168.19.24/29, options include selecting a host address that respects subnetting rules.

Key Exam Preparedness

  • Know how to derive subnet addresses, host ranges, and broadcast addresses using CIDR notation and subnet masks.
  • Familiarize with the key implications of subnetting on network design, especially in terms of efficiency and resource management.

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