Network Services

Question 1

dhcp

Answer 1

dynamic host configuration protocol
assigns ip, subnet mask, default gateway, dns server
ports 67, 68
udp

Question 2

dns

Answer 2

domain name system
convert domain name to ip
port 53
udp and tcp

Question 3

zone transfer

Answer 3

sharing of info between dns servers about their records

Question 4

ntp

Answer 4

network time protocol
syncs clocks between systems
port 123
udp

Question 5

dhcp scope

Answer 5

a list of valid ip addresses that are available for assignment or lease

Question 6

dora process

Answer 6

for dhcp

discover, offer, request, acknowledge

Question 7

dhcp relay

Answer 7

any host that forwards dhcp packets between clients and servers

Question 8

fqdn

Answer 8

fully qualified domain name
domain name is under a top-level provider like .com
ex: diontraining.com

Question 9

root level

Answer 9

highest level in dns hierarchy tree
contain global list of all top-level domains for com/net/mil
it is the “.” in .com

Question 10

top level domains

Answer 10

organizational: com/net/mil
geographical: uk/fr/it

Question 11

second level domain

Answer 11

directly below top level

ex: diontraining in diontraining.com

Question 12

sub-domain

Answer 12

a new server underneath second level

ex: store in store.dointraining.com

Question 13

host level

Answer 13

lowest and most detailed level inside of dns hierarchy

refers to specific machine

Question 14

a record

Answer 14

address record

link host name to ipv4

Question 15

aaaa record

Answer 15

address record

link host name to ipv6

Question 16

cname record

Answer 16

canonical name record

used instead of an a record to pint a domain to another domain

Question 17

mx record

Answer 17

mail exchange record
direct emails to mail server
how emails should be routed using smtp port 25

Question 18

soa record

Answer 18

start of authority record

used to store important info about a domain or zone

Question 19

dns zone transfer

Answer 19

process of sending dns records from primary to secondary name server

Question 20

ptr records

Answer 20

pointer records
correlate an ip address with a domain name
reverse a record

Question 21

txt record

Answer 21

text record
add text to dns
can be used to prove ownership of dns server

Question 22

srv record

Answer 22

service record

specify a host and port for a specific service

Question 23

ns record

Answer 23

name server record

indicate which dns server is the authoritative one for a domain

Question 24

external dns

Answer 24

records created around the domain names we purchased from a central authority and use on internet

Question 25

dns resolver

Answer 25

aka dns cache on local machine

Question 26

iterative lookup

Answer 26

dns client will continuously query dns servers until it finds the correct record

Question 27

recursive lookup

Answer 27

dns will hunt it down and report back to you, makes requests on behalf of client

Question 28

stratum

Answer 28

levels of for network time protocol | up to 15