Questions and Answers
What is your mask if you have a Class B network and need 29 subnets?
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?
How many bits must you borrow from the host field to provide the correct subnet mask for a network that needs 29 subnets?
What is the subnetwork address for a host with the IP address 200.10.5.68/28?
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The network address of 172.16.0.0/19 provides how many subnets and hosts?
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Which two statements describe the IP address 10.16.3.65/23? (Choose two.)
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If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?
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Which mask should you use on point-to-point links in order to reduce the waste of IP addresses?
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What is the subnetwork number of a host with an IP address of 172.16.66.0/21?
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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?
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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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