Network Configuration

Question 1

What command is used to show/manipulate routing, devices, policy routing and tunnels?

Answer 1

■ ip
■ usage: ip [options] object {command|help}
■ usage: ip addr show ens160
■ usage: ip -s link show ens160

Question 2

What commands can be used to trace a path to a remote host?

Answer 2

■ traceroute (support UDP and ICMP)

■ tracepath

Question 3

What command is used to report socket statistics?

Answer 3

■ ss

Question 4

What are the ways in which NetworkManager can be accessed?

Answer 4

■ nmcli
■ nm-connection-editor
■ nmtui

Question 5

How does NetworkManager see networking system?

Answer 5

■ device = network interface

■ connection = a configuration used by a device

Question 6

What command is used to test DNS server connectivity?

Answer 6

■ host [server.domain]

Question 7

What command is used to test host resolution with the /etc/hosts file?

Answer 7

■ getent hosts [hostname]

Question 8

If DHCP is used, /etc/resolv.conf is automatically rewritten as interfaces are started, how is this prevented?

Answer 8

■ Add ‘PEERDNS=no’ to the interface configuration file

■ nmcli con mod [interfacename] ipv4.ignore-auto-dns yes

Question 9

What command is used to check/edit the system hostname?

Answer 9

■ hostnamectl [status]

■ hostnamectl [systemhostname]