4.4 Your Computer on the Network

Question 1

N/W

layer

handles comms between directly connected devices

Answer 1

link layer

Question 2

N/W

layer

handles routing outside of individual networks and the unique addressing of devices beyond a single link layer network

Answer 2

network layer

Question 3

N/W

layer

enables individual programs to connect to each other

Answer 3

app layer

Question 4

N/W

comm endpoint for two programs talking to eachother

Answer 4

Socket

Question 5

N/W

socket

connect processes running on same device

Answer 5

unix sockets

Question 6

N/W

socket

connect apps using protocol that is fast but not resilient

Answer 6

UDP - User Datagram Protocol

Question 7

N/W

socket

more reliable that UDP and confirm receipt of data

Answer 7

TCP - Transmission Control Protocol

Question 8

N/W

query DNS info and provide verbose info about DNS queries and responses

Answer 8

dig

Question 9

N/W

query DNS info and provide condenses output

Answer 9

host

Question 10

N/W

configure N/W on Linux including N/W interfaces, addresses and routing

Answer 10

ip

Question 11

N/W

test connectivity to remote device

Answer 11

ping

Question 12

N/W

show socket info

Answer 12

ss

Question 13

N/W

assign IP Address to ens33 of a host
IPv4

Answer 13

sudo ip addr add 192.168.10.10/24 dev ens33

Question 14

N/W

assign IP Address to ens33 of a host
IPv6

Answer 14

sudo ip addr add 2001:0:0:abcd:0:8a2e:0370:7334/64 dev ens33

Question 15

N/W

private ip address examples

Answer 15

192.168.10.1

172.16.57.47

10.100.49.162

Question 16

N/W

entry would you add into the hosts file to assign 192.168.0.15 to example.com?

Answer 16

192.168.0.15 example.com

Question 17

N/W

What effect would the following command have?
sudo ip -6 route add default via 2001:db8:0:abcd::1

Answer 17

add a default route into the table that sends all IPv6 traffic to the router with an
internal address of 2001:db8:0:abcd::1

Question 18

N/W

DNS record type used to serve requests

Textual Data

Answer 18

TXT

Question 19

N/W

DNS record type used to serve requests

Reverse IP address lookup

Answer 19

PTR

Question 20

N/W

DNS record type used to serve requests

A domain that has no address of its own and relies on another domain for this information

Answer 20

CNAME

Question 21

N/W

DNS record type used to serve requests

Mail Server

Answer 21

MX

Question 22

N/W

e connects multiple networking interfaces. All interfaces connected to a bridge can
communicate as if they were connected to the same link layer network: All devices use IP
addresses from the same subnet and do not require a router in order to connect to each other.

Answer 22

bridging

Question 23

N/W

What option needs to be supplied to the ss command in order to view all established UDP
sockets

Answer 23

-u option shows all established UDP sockets

Question 24

N/W

command shows a summary of all sockets running on a Linux device?

Answer 24

ss -s