In the standard textbook comparison of typical guided and unguided media in…
2023
In the standard textbook comparison of typical guided and unguided media in computer networking, which of the following statements are correct?
(A) Guided media transmission supports higher data speeds compared to unguided media transmission.
(B) Guided media has less interference compared to unguided media.
(C) Unguided media transmission is more secure than guided media transmission.
Choose the correct answer from the options given below:
Answer: A. Only (A) and (B) — ConceptTransmission media are compared by signal confinement, bandwidth, susceptibility to interference, and exposure to interception. Guided media confines…
- A.
Only (A) and (B)
- B.
Only (A) and (C)
- C.
Only (B) and (C)
- D.
(A), (B) and (C)
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Show answer & explanation
Correct answer: A
Concept
Transmission media are compared by signal confinement, bandwidth, susceptibility to interference, and exposure to interception. Guided media confines signals to a physical path such as copper cable or optical fibre, whereas unguided media radiates signals through free space. In the standard networking comparison, fibre offers very high data capacity, a physical guide limits external interference, and an open wireless path is easier to intercept.
Application
Statement (A): guided media includes optical fibre, whose available bandwidth supports higher data rates than typical unguided links in this textbook comparison.
Statement (B): shielding, confinement, and fibre’s immunity to electromagnetic interference make guided paths less affected by external noise than open wireless propagation.
Statement (C): unguided signals travel through the air and can extend beyond controlled premises, so they are generally easier to intercept rather than more secure.
Contrast
Only (A) and (C) retains the security claim in (C) and leaves out the interference claim in (B).
Only (B) and (C) retains the security claim in (C) and leaves out the data-rate claim in (A).
(A), (B) and (C) retains all three claims, including the security claim in (C).
Cross-check and result
The guided-versus-unguided comparison supports (A) and (B), while the interception characteristic reverses (C). Therefore, the supported combination is Only (A) and (B).