Sony VAIO VPCX11 - Manual (Page 13)

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Getting Started >
Locating Controls and Ports
Right
A Network (LAN) port (page 45)
Pull the port cover down before using the network (LAN) port.
When the port cover disengages:
The port cover may disengage if you exert pressure on it when
opening it or disconnecting a LAN cable. To attach the port
cover, align the cover with the edge (1) of the port and push the
cover down until it clicks into place.
B Monitor port (page 66)