Unix Network Commands

Question 1

arp

Answer 1

address resolution protocol used to display and control mac address to IP address

Question 2

What does “arp -a “ does?

Answer 2

displays current options

Question 3

What does “arp -n” does?

Answer 3

displays iP as numbers instead of symbols

Question 4

What does “arp -i” does?

Answer 4

specifies that the arp command should be limited to the interface

Question 5

What does “arp -d” does?

Answer 5

deletes entry

Question 6

What does “arp -s” does?

Answer 6

added entry

Question 7

What does “arp -s tmp “ does?

Answer 7

makes the entry temporary

Question 8

What does “arp -s reject” does?

Answer 8

traffic to the destination specified will be rejected. sender will be notified

Question 9

What does “arp -s blackhole” does?

Answer 9

traffic to the destination specified will be rejected. sender will not be notified.

Question 10

dig

Answer 10

used to resolve FQDN to Ip address

Question 11

host

Answer 11

used to resolve FQDN to IP and IP to FQDN

Question 12

ifconfig

Answer 12

display host configuration about those interfaces. This could also update the configuration

Question 13

traceroute

Answer 13

prints out the route packets trace to network host

Question 14

netstat

Answer 14

display various information about current connections

Question 15

What does “netstat -a “ does?

Answer 15

displays all host active Ip-based sessions

Question 16

What does “netstat - b “ does?

Answer 16

shows the names of the programs

Question 17

What does “netstat -r” does?

Answer 17

shows the routing table

Question 18

What does “netstat -s” does?

Answer 18

shows the statics

Question 19

ping

Answer 19

used to test network reachability

Question 20

what does “ping -c” does?

Answer 20

the number of pings to send

Question 21

what does “ping -d” does?

Answer 21

don’t fragment bit

Question 22

what does “ping -s” does?

Answer 22

let you pick which host to send from if machine has more than one host.

Question 23

whois

Answer 23

search the directory service for information about a client

Question 24

iptables

Answer 24

used to set up and maintain and inspect packed used to filter traffic for ip4/6

Question 25

what does iptables -a mean?

Answer 25

add a rule

Question 26

what does iptables -c mean?

Answer 26

mean to check a rule

Question 27

what does iptables -j mean?

Answer 27

tell what to do if a packet match

Question 28

what does iptables -d mean?

Answer 28

delete a rule

Question 29

What are the 3 chains in IPtable

Answer 29

INPUT, OUTPUT, FOWARd

Question 30

tcpdump

Answer 30

dumps network traffic.