Question

Match List - I with List - II. 

List - I		List - II
A.	Ethernet	I.	Uses token passing and deterministic access
B.	Token ring	II.	Uses CSMA/CD for medium access
C.	Wi-Fi (802.11)	III.	Uses CSMA/CA to avoid collision
D.	Bluetooth	IV.	IEEE 802.15.1

Choose the correct answer from the options given below:

• A. A-II, B-I, C-III, D-IV
• B. A-II, B-III, C-I, D-IV
• C. A-IV, B-II, C-III, D-I
• D. A-I, B-II, C-III, D-IV

Hint:

Wires detect (CSMA/CD). Wireless avoids (CSMA/CA). Rings pass tokens. Bluetooth is 15.1.

Answer 1

The Correct Option is A

Concept:
• Medium Access Control (MAC) protocols determine how multiple nodes share the same physical channel.
• Standard bodies like IEEE define specific protocols (802.3, 802.11, etc.) for different network technologies.

Step 1: Match A with II (Ethernet)
Standard Ethernet (IEEE 802.3) uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) to manage access on a shared bus. So, A matches with II.

Step 2: Match B with I (Token Ring)
IEEE 802.5 (Token Ring) uses a "token passing" protocol. It provides "deterministic access" because a station only transmits when it holds the token. So, B matches with I.

Step 3: Match C with III (Wi-Fi)
IEEE 802.11 (Wi-Fi) uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) because collision detection is difficult to implement in wireless channels. So, C matches with III.

Step 4: Match D with IV (Bluetooth)
Bluetooth is the commercial name for the IEEE 802.15.1 standard, which focuses on Wireless Personal Area Networks (WPAN). So, D matches with IV.