SSC CGL 2025 Tier-II · Paper-I, 19 January 2026 · Computer Knowledge Test · Question 17 of 150

We transcribed this text from the pictures of a candidate's response sheet for this paper; the answer is the key SSC marked with a green tick on that sheet. Solution last reviewed 11 September 2026.

Where this paper and its answers come from

SSC does not publish CGL question papers or a public answer key. This paper reaches us as a candidate's response sheet saved as pictures, so we transcribed the text from those pictures, and a second reader checked every question against them; where the layout carries meaning, we show the picture too. Each answer is the key SSC marked with a green tick on that sheet. SSC released a tentative key for challenge and later its final one, both only to candidates behind a login, and the sheet does not say which of the two it carries. UnlockIAS wrote the solutions.

When comparing HDMI and DisplayPort, which feature is unique to the DisplayPort architecture?

(a)Daisy Chaining (MST)
(b)Ethernet over cable
(c)TMDS signaling
(d)Uncompressed audio

Answer

Why

Correct — A. Multi-Stream Transport (MST) lets one DisplayPort output carry several independent display streams, so monitors can be daisy-chained: each has a DisplayPort input and a DisplayPort output feeding the next.

VESA, which publishes the DisplayPort standard, calls MST DisplayPort's unique Multi-stream Transport capability → option (a).

Why the others are wrong

(b)
Ethernet over cable — Ethernet over the cable is an HDMI feature. The HDMI Ethernet Channel adds networking to an HDMI link and needs a High Speed HDMI Cable with Ethernet.
(c)
TMDS signaling — TMDS (transition-minimized differential signalling) is the signalling DVI and HDMI links use. DisplayPort sends its data in packets instead, so TMDS is HDMI's side of the comparison.
(d)
Uncompressed audio — Uncompressed audio travels over both. DisplayPort 1.2 carries uncompressed display and audio streams, and HDMI's eARC supports 5.1, 7.1 and 32-channel uncompressed audio.

Concept

HDMI and DisplayPort both carry digital video and audio over one cable, but they are built differently. DisplayPort, from VESA, uses a packetized data structure like data-communication links, which lets it be combined with USB and Thunderbolt through a common connector.

Multi-streaming came with DisplayPort 1.2: the ability to transport multiple independent uncompressed display and audio streams over a single cable, to monitors connected in a daisy chain or through a hub.

Key facts

VESA announced DisplayPort 1.2, with multi-streaming, on 7 January 2010.
DisplayPort 1.2 doubled the maximum data rate from 10.8 Gbps to 21.6 Gbps.
A daisy-chainable DisplayPort 1.2 monitor has both a DisplayPort input and a DisplayPort output.
The HDMI Ethernet Channel needs a High Speed HDMI Cable with Ethernet.

Study next

DisplayPort Alt Mode over USB-CHDMI's Audio Return Channel (ARC) and eARCTMDS signalling in DVI and HDMI against DisplayPort's packets

Common traps

Picking Ethernet over cable because it sounds like a computer-network feature, when it is HDMI's.
Picking uncompressed audio, which both interfaces carry.

The stem asks for a feature unique to one of two interfaces, so each wrong option belongs to the other interface or to both. Sort every option into HDMI, DisplayPort or both before choosing.

Related PYQs

No directly related past PYQ was found.

Topic: Computer Basics — all 7 SSC CGL questions on it, every solved shift.