Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Officer - 28.03.2014
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

Each IP packet is a fundamental component of network communication, containing crucial information that allows data to be routed across the internet. The correct answer to the question is **C) Source and destination address**, as both addresses are essential for the packet's delivery.

The **source address** indicates where the packet is coming from, allowing the recipient to know the origin of the data. This is vital for replies, as the receiving device needs to know where to send responses. The **destination address**, on the other hand, specifies where the packet needs to go, guiding it through various network paths until it reaches its intended recipient.

In the context of the Internet Protocol (IP), each packet encapsulates not just data, but also this addressing information within its header fields. Both addresses are utilized by routers and switches in the network to make forwarding decisions and ensure the packet is delivered correctly and efficiently. Without either address, the packet would lack the necessary information for proper routing, which underscores why both are indispensable in the structure of an IP packet. Thus, the inclusion of both source and destination addresses in an IP packet is fundamental to enabling effective communication across networks.