# Q6A · Media classification and fiber

Subject: Computer Networks

Exam: TEE

Reader: https://deep-learning-study-room.vercel.app/cn/#tee/papers/tee-paper-reexam/q6a

Canonical: https://deep-learning-study-room.vercel.app/read/cn/tee/papers/tee-paper-reexam--q6a/

TEE · Actual TEE paper · all questions · current syllabus 702AI0C023

### Actual PYQ · Q6A. How is transmission media classified? List advantages and disadvantages of optical fiber. [5 marks]

#### Answer

Transmission media are classified into guided media (twisted pair, coaxial cable, optical fiber) and unguided media (radio, microwave, infrared).

Optical fiber carries data as light in a core surrounded by cladding. It is a guided medium. Single-mode fiber supports one main propagation mode and is used for long/high-capacity links; multimode supports multiple modes and is often used over shorter distances.

| Advantages | Disadvantages / design costs |
| --- | --- |
| High data capacity and low attenuation over suitable links | Optical transceivers, connectors and splicing add cost/skill requirements |
| Immune to electromagnetic interference; no electrical crosstalk | Tight bends, dirty connectors and poor installation increase loss |
| Electrical isolation between buildings | Fiber is mechanically sensitive and requires appropriate protection |
| Harder to tap casually than an unprotected radio channel | It is not automatically confidential; encryption/access control remain necessary |

#### Practical example

A campus backbone can use fiber between buildings to avoid electrical interference and achieve high capacity. Installers still need to respect bend radius and test connectors.

Source: Re-exam · 4 February 2026, original question paper page 2. Original marks retained; solution independently authored.