Which connection uses the default encapsulation for serial interfaces on Cisco routers?

The correct answer is B. The serial connection to the North branch office. The default encapsulation on Cisco serial interfaces is HDLC (High-Level Data Link Control) - specifically Cisco's proprietary version of HDLC. This is applied automatically when no encapsulation is manually configured. In the network topology referenced by this question, the…

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Question

Which connection uses the default encapsulation for serial interfaces on Cisco routers?

Exhibit

Options

AThe serial connection to the NorthCoast branch office.
BThe serial connection to the North branch office.
CThe serial connection to the SouthIslands branch office.
DThe serial connection to the Multinationai Core.

How the community answered

(29 responses)

B
90% (26)
C
7% (2)
D
3% (1)

Explanation

The default encapsulation on Cisco serial interfaces is HDLC (High-Level Data Link Control) - specifically Cisco's proprietary version of HDLC. This is applied automatically when no encapsulation is manually configured. In the network topology referenced by this question, the serial connection to the North branch office uses Cisco HDLC (the default), while the other serial connections have been explicitly configured with a different encapsulation (such as PPP or Frame Relay). When troubleshooting, if two connected serial interfaces have mismatched encapsulations, the link will not come up - so knowing the default (HDLC) is important for Cisco certification exams.

Topics

#HDLC encapsulation#default serial encapsulation#WAN serial interface#Cisco default

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