Which of the following protocols is commonly used for data encapsulation in WANs?

Correct option is D

High-Level Data Link Control (HDLC) is commonly used for data encapsulation in Wide Area Networks (WANs). HDLC is a data link layer protocol used for transmitting data over point-to-point and multipoint links. It provides reliable communication by managing error detection and correction, and it encapsulates data into frames for transmission.
Important Key Points:
1. Data Encapsulation: HDLC is responsible for encapsulating data into frames for secure and efficient transmission over WANs.
2. Error Control: HDLC includes error detection and correction, ensuring that data is transmitted accurately between devices.
3. WAN Use: HDLC is widely used in WAN technologies such as leased lines, frame relay, and certain types of satellite communications.
Knowledge Booster:
· Ethernet: This is primarily used in local area networks (LANs), not for WAN data encapsulation.
· TCP/IP: While TCP/IP is a suite of protocols used for communication over the Internet and WANs, it operates at higher layers (network and transport layers) and is not directly responsible for data link layer encapsulation.
· Wi-Fi: Wi-Fi is a wireless communication protocol used primarily for local networks, not for WAN data encapsulation.