A dedicated bearer shares what with its parent default bearer?

Interview
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Q. A dedicated bearer shares what with its parent default bearer?

a) Different TFT
b) Same QCI
c) Same EPS Bearer ID
d) Same IP address

Check 🔎

:arrow_right: Correct answer: Letter d.

In the EPS bearer architecture, a dedicated bearer is established to provide specific QoS (for example, for VoLTE voice). It is always associated with a default bearer, which provides the default IP connectivity to the UE.

While the dedicated bearer has its own QoS parameters (like a separate QCI) and its own EPS Bearer ID, it shares the same IP address as the default bearer, because there is only one PDN connection established per APN. This means all bearers under that PDN share the same IP assigned by the PGW.

Q. A dedicated bearer shares what with its parent default bearer?

a) :x: Different TFT
→ Incorrect. The dedicated bearer actually uses a different TFT (Traffic Flow Template) to filter specific traffic flows.

b) :x: Same QCI
→ Incorrect. The dedicated bearer normally uses a different QCI optimized for its traffic (e.g., QCI 1 for voice), separate from the default bearer’s QCI 9.

c) :x: Same EPS Bearer ID
→ Incorrect. Each bearer, default or dedicated, has its own EPS Bearer ID for separate identification.

d) :white_check_mark: Same IP address
→ Correct. Both dedicated and default bearers share the same IP address allocated by the PGW, since they belong to the same PDN connection.