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Which EXEC-level command displays the default or manually configured encapsulation type of a serial interface?
show ip interface serial
show controllers
show ip interface brief
show interfaces serial
The "show interfaces serial" command is used to display the default or manually configured encapsulation type of a serial interface. Example encapsulation types are HDLC and PPP. The "show controllers" command is used to display controller statistics, cable types (V.35/V.11 DCE or DTE). The "show ip interface serial" shows the IP interface status configurations but not the encapsulation type. The "show ip interface brief" shows the brief/summary IP interface configurations but not the encapsulation type. (http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/14149-chapter15.html#topic1)
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