Ch. 4.4

Question 1

What command-line tools report a host’s IP configuration?

Windows vs Linux

Answer 1

ipconfig (win)
ifconfig(linux)

Question 2

What tool verifies if a host can contact another host?

Answer 2

ping

Question 3

What does ipconfig do? (3)

Answer 3

Displays IP Address, Subnet Mask, and Gateway for all network interfaces

Question 4

What does ipconfig /all do?

Answer 4

(Network ID, Subnet Mask, Default Gateway)
(DHCP, DNS, MAC address, TCP/IP)

Question 5

What does ipconfig /renew interface do?

Answer 5

Forces DHCP client to renew IP lease

Question 6

What does ipconfig /release interface do?

Answer 6

Releases IP address from DHCP so interfaces don’t have an IP address?

Question 7

What does ipconfig /displaydns do?

Answer 7

Shows DNS cache

Question 8

What does ipconfig /flushdns do?

Answer 8

Clears DNS cache

Question 9

What is ifconfig?

Answer 9

Legacy Linux command to check network configuration

Question 10

What is ip command?

Answer 10

Updated Linux command of ifconfig

Question 11

What does ip addr do?

Answer 11

Shows current address configuration on Linux

Question 12

What does ip addr show dev eth0 do?

Answer 12

Reports single interface on Linux

Question 13

What does ip link do?

Answer 13

Status of interfaces on Linux

Question 14

What does ip -s link do?

Answer 14

Shows interface statistics on Linux

Question 15

What does ip link set eth0 up|down do?

Answer 15

Enables/disables an interface on Linux

Question 16

What does ip addr add|delete do?

Answer 16

Modify IP address configuration on Linux

Question 17

What is ifconfig?

Is it still in use?

What does it do?

Answer 17

Linux legacy net-tools package

No, it’s deprecated

Reports network interface configuration.

Question 18

What is net-tools?

What’s an alternative to net-tools?

Answer 18

Linux network utility package.

iproute2 package
Interfaces modern manager packages

Question 19

How do you get report on a single interface only?

Answer 19

ip addr show dev eth0

Question 20

What is ARP?

What is it used for?

Answer 20

Address Resolution Protocol

Used by hosts to determine MAC address with IP address

Question 21

Are ARP queries sent as unicasts or broadcasts?

Answer 21

Broadcasts

Question 22

How do you make ARP broadcasts efficient?

Answer 22

Cache results of ARP broadcast to an ARP table

Question 23

What doe the ARP command do?

Answer 23

Functions related to ARP table cache

Question 24

What does “arp -a” do?

Answer 24

Shows ARP cache contents

Question 25

What does "arp -s [MAC Address]" do?

Answer 25

Adds entry to ARP cache

Question 26

What does "arp -d*" do?

Answer 26

Deletes all ARP cache.

Question 27

What does "ip neigh" do?

Answer 27

Linux command Shows entries in ARP cache

Question 28

What does ICMP stand for? What is it used for? What typically makes them?

Answer 28

Internet Control Message Protocol Reports errors/messages about the delivery of a packet. Unicast.

Question 29

What is the "ping" command for?

Answer 29

Basic connectivity test

Question 30

What does "Destination Host Unreachable" error mean for pings?

Answer 30

PC doesn't know how to get to that IP address

Question 31

What does "No Reply (Request Timed Out.)" mean for pings?

Answer 31

Host is unavailable OR Cannot route a reply back to you

Question 32

How do you set the number of packets to ping?

Answer 32

-c switch

Question 33

What does ipconfig /registerdns do?

Answer 33

Registers the host with a DNS server

Question 34

What does -4 or -6 do for ping commands?

Answer 34

Force IPv4 or IPv6 versions of the ping