section 10 networking

Question 1

Four basic components for network connectivity?

Answer 1

IP address
subnet mask
default gateway
DNS server IP address

Question 2

What command lists nearby wireless networks?

Answer 2

iwlist

Question 3

What command connects to or disconnects from specific wireless networks?

Answer 3

iwconfig

Question 4

What command can apply an ip address or subnet mask to a specific hardware interface, and connect/disconnect to a wired network?

Answer 4

ifconfig

Question 5

What command can view the default gateway?

Answer 5

route

Question 6

Where is DNS info configured?

Answer 6

/etc/resolv.conf

Question 7

Where is DNS info configured?

Answer 7

/etc/resolv.confq

Question 8

What commands configure DHCP info?

Answer 8

dhclient
dhcpcd

Question 9

three commands useful for DNS troubleshooting

Answer 9

host
dig
nslookup

Question 10

What is netstat?

Answer 10

netstat -a

Question 11

What is Linux’s primary security concern?

Answer 11

Server daemons running in the background such as apache web server, SSH, mail, etc.

Remediate by shutting down the service or uninstalling it.

Question 12

how do you view your ip address?

Answer 12

ip address show

Question 13

how do you view layer 2 info?

Answer 13

ip link show

Question 14

How do you disable a wired interface?

Answer 14

ip link set eth0 down

Question 15

how do you manually add an ip address?

Answer 15

ip addr add 192.168.0.1/24 dev eth0

(use addr instead of address)

Question 16

What are the 3 DHCP mechanisms for IP address allocation?

Answer 16

Automatic allocation allows DHCP to assigns a permanent IP address to a device.

Dynamic allocation is used when DHCP assigns an IP address to a device for a limited period of time.

Manual allocation occurs when a device’s IP address is assigned by the network administrator, and DHCP is used to convey the assigned address to the device.