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RHCSA Commands > Network > Flashcards

Network Flashcards

1
Q

lists all available network interfaces on your system

A

ip link show

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2
Q

view device and address info of device ens3

A 
ip addr show ens3
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3
Q

show statistics about a specific network dev performance

A 
ip -s link show ens3
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4
Q

tests connectivity to a machine

A

ping -c3 192.0.2.254

ping6 2001:db8:0:1::1

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5
Q

find other IPv6 nodes on the local network

A

ping6 ff02::1%ens4

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6
Q

show routing information

A

ip route

ip -6 route

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7
Q

trace the network traffic path to reach a remote host

A 
tracepath access.redhat.com
mtr access.redhat.com
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8
Q

display socket statistics.

A

ss -ta
ss -plunt

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9
Q

Locate the network interface name that is associated with the 52:54:00:00:fa:0a Ethernet address

A 
ip link
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10
Q

Display the current IP address and netmask for all interfaces

A

ip -br addr

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11
Q

Display the statistics for the enX interface.

A 
ip -s link show enX
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12
Q

Display the listening TCP sockets on the local system

A

ss -lt

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13
Q

displays the status of all network devices

A

nmcli dev status

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14
Q

displays a list of all connections.

A 
nmcli con show
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15
Q

displays a list of all active connections.

A 
nmcli con show --active
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16
Q

adds an eno2 connection of the ethernet type for the eno2 network interface

A 
nmcli con add 
con-name eno2 
type ethernet 
ifname eno2
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17
Q

creates an eno3 connection of the ethernet type for the eno3 network interface with a static IPv4 network setting

A 
nmcli con add 
con-name eno3 
type ethernet 
ifname eno3 
ipv4.method manual 
ipv4.addresses 192.168.0.5/24 
ipv4.gateway 192.168.0.254
18
Q

activates a network connection on the device that it is bound to

A 
nmcli con up static-ens3
19
Q

disconnects the network device and brings down the connection

A

nmcli dev disconnect ens3

20
Q

list the current settings for a connection

A

nmcli con show static-ens3

21
Q

update the static-ens3 connection to set the 192.0.2.2/24 IPv4 address and the 192.0.2.254 default gateway. automatically enable the connection at system boot.

A 
nmcli con mod static-ens3
ipv4.addresses 192.0.2.2/24 
ipv4.gateway 192.0.2.254
connection.autoconnect yes
22
Q

update the static-ens3 connection to set the 2001:db8:0:1::a00:1/64 IPv6 address and the 2001:db8:0:1::1 default gateway

A 
nmcli con mod static-ens3 
ipv6.addresses 2001:db8:0:1::a00:1/64
ipv6.gateway 2001:db8:0:1::1
23
Q

adds the 2.2.2.2 DNS server to the static-ens3 connection

A 
nmcli con mod static-ens3 +ipv4.dns 2.2.2.2
24
Q

loads all connection profiles

A

nmcli con reload

25
Q

loads only the eno2 connection profile

A 
nmcli con reload en02
26
Q

deletes a connection from the system

A

nmcli con del static-ens3

27
Q

view your current permissions

A

nmcli gen permissions

28
Q

useful network manager commands

A

nmcli dev status
nmcli dev disconnect

nmcli con show
nmcli con up
nmcli con reload
nmclicon edit

nmcli con mod
nmcli con add
nmcli con del

29
Q

NetworkManager config file format

A

ini

30
Q

Connection properties

A

ip4.address1
ip4.method
ip4.gateway
ip4.dns
ip4.dns-search
ip4.ignore-auto-dns

connection.autoconnect
connection.id
connection.interface-name
connection.type
connection.uuid

802-3-ethernet.mac-address

31
Q

What do you do after changing a connection config file?

A 
nmcli con reload
nmcli con up static-ens3
32
Q

Determine hostname

A

hostname

33
Q

Where is hostname stored

A

/etc/hostname

34
Q

Set hostname via cli

A 
hostnamectl hostname example.com
35
Q

How does stub resolver go about converting names to ips?

A

determines where to look based on /etc/nsswitch.conf . By default it uses /etc/hosts

36
Q

Command to test hostname resolution

A

getent hosts hostname

37
Q

Explain the content of /etc/resolv.conf

A

nameserver: up to 3 nameservers
search: suffixes to append to requests when querying just a hostname
domain: hostname resolution in a local network

38
Q

Change dns with nmcli

A 
nmcli con mod ID ipv4.dns IP
nmcli con down ID
nmcli con up ID
39
Q

adds or removes an individual dns entry

A 
nmcli con mod ID +ipv4.dns IP
40
Q

test DNS server connectivity

A 
dig example.com
host example.com
41
Q

test DNS server connectivity specifically usin /etc/hosts

A 
getent hosts example.com

RHCSA Commands (23 decks)

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