Connecting 2014 Macbook Pro to ethernet

You have no extra cables for your computer? What you need is a Thunderbolt to ethernet cable. Is this because WIFI doesn't work? Anyway Amazon sells them as does the Apple Store.

https://www.amazon.com/Apple-Thunderbolt-Gigabit-Ethernet-Adapter/dp/B011K4RKFW

Thunderbolt to Gigabit Ethernet Adapter - Apple

my ginger wrote:

You are correct. There is no ethernet port. You need the thunderbolt to ethernet adapter.

MacBook Pro (Retina, 15-inch, Mid 2012) - Technical Specifications

The OP did not specify a "Retina" display. So the specs I posted were correct for the question. The image posted was the retina display computer. So eventually we got to the correct answer. Shows the importance od providing the correct Mac version/year/etc.

Then it is not a mid 2012 Macbook Pro.

From the specs :

Connections and Expansion

• MagSafe power port
• Gigabit Ethernet port
• FireWire 800 port (up to 800 Mbps)
• Two USB 3 ports (up to 5 Gbps)
• Thunderbolt port (up to 10 Gbps)
• Audio line in
• Audio line out
• SDXC card slot
• Kensington lock slot
• 8x SuperDrive

You are correct. There is no ethernet port. You need the thunderbolt to ethernet adapter.

MacBook Pro (Retina, 15-inch, Mid 2012) - Technical Specifications

The mid 2012 MacBook Pro has an Ethernet port. You don't need an adapter.

MacBook Pro (15-inch, Mid 2012) - Technical Specifications

True.