What notation replaced classful routing to represent IP addresses and their subnet masks?

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Multiple Choice

What notation replaced classful routing to represent IP addresses and their subnet masks?

Explanation:
CIDR notation represents an IP address along with its subnet mask using a slash and a prefix length, such as 192.168.0.0/24. This replaces rigid classful routing, where the subnet mask was tied to the address class (A, B, or C), which often wasted address space and produced larger routing tables. With CIDR, you can use any prefix length (for example /16, /24, /23), enabling flexible subnetting and route aggregation to keep routing tables smaller and more efficient. The number after the slash indicates how many high-order bits form the network portion, with the remainder available for hosts. For instance, 10.0.0.0/8 is a single large network with a 255.0.0.0 mask, while 10.0.0.0/16 uses 255.255.0.0. Other terms like DHCP, NAT, and ARP serve different roles (automatic IP assignment, address translation, and IP-to-MAC mapping, respectively) and do not define how IPs and masks are written.

CIDR notation represents an IP address along with its subnet mask using a slash and a prefix length, such as 192.168.0.0/24. This replaces rigid classful routing, where the subnet mask was tied to the address class (A, B, or C), which often wasted address space and produced larger routing tables. With CIDR, you can use any prefix length (for example /16, /24, /23), enabling flexible subnetting and route aggregation to keep routing tables smaller and more efficient. The number after the slash indicates how many high-order bits form the network portion, with the remainder available for hosts. For instance, 10.0.0.0/8 is a single large network with a 255.0.0.0 mask, while 10.0.0.0/16 uses 255.255.0.0. Other terms like DHCP, NAT, and ARP serve different roles (automatic IP assignment, address translation, and IP-to-MAC mapping, respectively) and do not define how IPs and masks are written.

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