link/loopback: The media access control (MAC) address of the interface.qlen 1000: The maximum length of the transmission queue.The default is to place them all in a group called “default.” group default: Interfaces can be grouped logically.state UNKNOWN: This can be DOWN (the network interface is not operational), UNKNOWN (the network interface is operational but nothing is connected), or UP (the network is operational and there is a connection).The noqueue discipline means “send instantly, don’t queue.” This is the default qdisc discipline for virtual devices, such as the loopback address. There are different queuing techniques called disciplines. It schedules the transmission of packets. qdisc noqueue: A qdisc is a queuing mechanism.This is the size of the largest chunk of data this interface can transmit. The physical networking layer (layer one) is also up.
lo: The network interface name as a string.Let’s break down all the information we received:
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