Question

Identify the wired transmission media for the following: “They are less expensive and commonly used in telephone lines and LANs. These cables are of two types: Unshielded and shielded.”

• A. Optical Fibre
• B. Coaxial Cable
• C. Twisted pair cable
• D. Microwaves

Hint:

Twisted pair cables are cheap and widely used. UTP is most common in LAN connections, while STP provides better noise resistance.

Answer 1

The Correct Option is C

Step 1: Analyze the description.
- "Less expensive and commonly used in telephone lines and LANs" correctly identifies twisted pair cables.
- These cables exist in two main forms: Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP).
Step 2: Evaluate options.
- Optical Fibre: Characterized by high cost, high speed, and long-distance capabilities, but not typical for basic telephone/LAN use.
- Coaxial Cable: Primarily utilized for cable TV and broadband, not standard for LAN telephony.
- Twisted pair cable: Matches the description → suitable for LANs and telephone lines, available as UTP/STP.
- Microwaves: A wireless communication method, not a wired medium.

Final Answer: \[\boxed{\text{Twisted pair cable}}\]