Untitled Quiz

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.