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We can review information regarding our network interfaces and manage them 
with the 
ip
 command. For example, we can use 
ip addr show
 to view our currently 
assigned IP address:
ip addr show
This will produce an output similar to that shown in the following screenshot:
Figure 10.3: Viewing IP information with the ip addr show command
Once you enter that command, you should see output that pertains to the network 
interfaces that you have available and their current status. Also, you can abbreviate 
the command all the way down to simply 
ip a
. The output will be the same in either 
case. From the output, we can see several useful tidbits, such as the IP address for 
each device (if it has one), as well as its MAC address.
Using the 
ip
 command, we can also manage the state of an interface. We can bring a 
device down (prevent it from connecting to networks), and then back up again:
sudo ip link set enp0s3 down 
sudo ip link set enp0s3 up 
In that example, I'm simply toggling the state for interface 
enp0s3
. First, I'm bringing 
it down, and then I'm bringing it back up again.
Bringing interfaces up and down is all well and good, but what's up with that 
naming convention? The convention used in Ubuntu 20.04 may seem a bit strange 
for those of you that have grown accustomed to the scheme used in earlier versions, 
which utilized network interface names such as 
eth0
, 
wlan0
, and so on. Since Ubuntu 
is based on Debian, it has adopted the new naming convention that was introduced 
starting with Debian 9.0.

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Chapter 10