Consider the classful addressing, the IP address 128.252.144.84 denotes:

To solve this, we must identify the Class of the IP address based on its first octet.

1. Identify the Class: The IP address is 128.252.144.84.

• Class A: 1 – 126

• Class B: 128 – 191

• Class C: 192 – 223

Since the first octet is 128, this is a Class B address.

2. Determine Network and Host ID: In Classful addressing, Class B uses a specific format for the 32-bit address:

• Network ID: The first 2 octets (16 bits).

• Host (Node) ID: The remaining 2 octets (16 bits).

3. Apply to the given IP:

• Network ID: 128.252.0.0 (The first two octets are kept, and the rest are set to zero).

• Node ID: While the "Node ID" can refer to the host portion (0.0.144.84), in many examination contexts, it is represented by showing the full IP to denote which specific node belongs to that network. Option D follows the standard convention of identifying the Network portion clearly.