Networking IPv4 Classes Quiz

IPv4 Address Classes

• Class A: First octet range 1-126.
• Class B: First octet range 128-191.
• Class C: First octet range 192-223.
• Class D: First octet range 224-239.

Classless Inter-Domain Routing (CIDR)

• CIDR allows the creation of subnets with flexible bit allocation instead of fixed 8-bit blocks.
• Variable Length Subnet Masking (VLSM) enables subnetting with custom host bits, enhancing network flexibility.
• APIPA is used for automatic IP addressing when DHCP is unavailable.
• Virtual Local Area Networks (VLAN) create separate broadcast domains in large networks.
• EUI-64 is an IPv6 address creation method from MAC addresses.

Subnet Mask Calculation

• For the network 10.12.0.0/14, the subnet mask in binary is 11111111 11111100 00000000 00000000.
• The decimal equivalent of this binary mask is 255.252.0.0.

Subnetting in Class C Addresses

• Class C address: 192.168.30.0; needs 10 subnets with 14 hosts each.
• Allocating 4 bits for subnets allows for 16 subnets.
• Remaining 4 bits provide sufficient addresses for 14 hosts per subnet.

Subnet Creation with Class A

• Using a 14-bit subnet identifier can yield up to 16,384 possible subnets (2^14).

Subnetting Requirements for Class C Address

• For 4 subnets with 28 hosts per subnet:
  • 3 bits for subnets allows for 8 subnets.
  • 5 bits for hosts supports 30 addresses.
  • New subnet mask becomes 255.255.255.224.

MAC Address Overview

• A sitcom provides an example of a hexadecimal MAC address format (e.g., 001F9EFC7AD0).