What is the name of the layer in the OSI model that is responsible for error detection and correction?
Correct answer: B. Data Link layer
- A. Physical layer
- B. Data Link layer
- C. Network layer
- D. Transport layer
Explanation
The data link layer plays a crucial role in ensuring reliable data transmission. It detects and corrects errors that may occur during physical transmission over the communication channel. Here's how it works:Data link layer protocols like Ethernet or High-Level Data Link Control (HDLC) add frame headers and trailers to the data packets. These headers and trailers contain error-detecting codes, such as cyclic redundancy check (CRC).The sender calculates the CRC based on the data and includes it in the frame trailer.The receiver recalculates the CRC for the received data and compares it to the received CRC value.If the CRCs match, the data is assumed to be error-free. If they don't match, an error is detected, and the receiver can request retransmission of the corrupted frame.By employing error detection and correction mechanisms, the data link layer helps to ensure the integrity of data during transmission, making it a vital component of reliable communication in the OSI model.
Last updated
About Networking and Internet
Networking covers LAN, MAN, WAN and wireless networks, network topologies, transmission media, devices such as switches, routers and modems, and the OSI and TCP/IP models. Internet concepts include IP addresses, DNS, URLs, web browsers, email, protocols such as HTTP, HTTPS, FTP and SMTP, and basic network security.
Practise Networking and Internet
452 free Networking and Internet MCQs from Computer Science and IT, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Computer Science and IT questions like this
Computer Science and IT is on 40 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.