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Does the MacBook Air really not have an Ethernet port? How can you connect to wired networks?
Indeed, MacBook Air models really do not have an onboard Ethernet port. However it is possible to connect to wired Ethernet networks with an adapter.
Photo Credit: Kanex (USB 3.0 Gigabit Ethernet Adapter)
Apple offered an external Apple 10/100Base-T Ethernet USB adapter as an US$29 option for the "original" and "NVIDIA/Late 2008" models. For the "Mid-2009" models, Apple provided the external Ethernet adapter free of charge. For the "Late 2010" models and "Mid-2011" models, Apple again provided it as a US$29 option.
For the "Mid-2012" and "Mid-2013" MacBook Air models, Apple offers an optional Thunderbolt to Gigabit Ethernet adapter for US$29.
Apple Authorized site sponsor PowerMax sells both the Apple 10/100Base-T Ethernet adapter (MC704ZM/A) and the Apple Thunderbolt-to-Gigabit Ethernet adapter (MD463ZM/A). Other World Computing also has third-party Ethernet adapter options (including the USB 3.0 to Gigabit Ethernet adapter above).
Apple used to offer an external Apple USB Modem (56.6k v.92) for US$49 (MA034Z/A), but it no longer does. Just like all the other Intel-based Macs, Apple does not offer an internal modem with the MacBook Air, either. However, third-party USB modems designed for travel are available still.
Photo Credit: USB Modems -- StarTech (Left), Zoom Telephonics (Right)
Third-party modems are compatible with MacBook Air models running Mac OS X 10.5 "Leopard" or Mac OS X 10.6 "Snow Leopard". OS X 10.7 "Lion" and later versions of the operating system do not support modems at all.
No. The "MagSafe" or "MagSafe 2" power connector that has shipped with each MacBook Air model only provides 45-watts of power, and as such, cannot power a MacBook or MacBook Pro model, which all require more power.
Additionally, the "MagSafe" power connector for the original, "Late 2008" and "Mid-2009" MacBook Air models is rotated 90-degrees to save space. A "regular" MacBook "MagSafe" power connector will provide power to these earlier MacBook Air models, but it won't fit when the MacBook Air sits on a flat surface. On the other hand, a regular MacBook "MagSafe" power connector can provide power to the "Late 2010" and "Mid-2011" MacBook Air models.
The "Mid-2012" and "Mid-2013" MacBook Air models have a "MagSafe 2" power adapter and can be powered by its own power adapter or the "MagSafe 2" power connector from a Retina Display MacBook Pro.
The MagSafe 2 power connector is not backwards compatible with earlier power adapters, but an earlier MagSafe power adapter can be used to charge a MagSafe 2-equipped MacBook Air with the Apple MagSafe-to-MagSafe 2 converter from Apple or site sponsor PowerMax (MD504ZM/A).