Network Services Flashcards

1
Q

dhcp

A

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

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2
Q

dns

A

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

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3
Q

zone transfer

A

sharing of info between dns servers about their records

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4
Q

ntp

A

network time protocol
syncs clocks between systems
port 123
udp

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5
Q

dhcp scope

A

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

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6
Q

dora process

A

for dhcp

discover, offer, request, acknowledge

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7
Q

dhcp relay

A

any host that forwards dhcp packets between clients and servers

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8
Q

fqdn

A

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

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9
Q

root level

A

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

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10
Q

top level domains

A

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

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11
Q

second level domain

A

directly below top level

ex: diontraining in diontraining.com

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12
Q

sub-domain

A

a new server underneath second level

ex: store in store.dointraining.com

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13
Q

host level

A

lowest and most detailed level inside of dns hierarchy

refers to specific machine

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14
Q

a record

A

address record

link host name to ipv4

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15
Q

aaaa record

A

address record

link host name to ipv6

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16
Q

cname record

A

canonical name record

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

17
Q

mx record

A

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

18
Q

soa record

A

start of authority record

used to store important info about a domain or zone

19
Q

dns zone transfer

A

process of sending dns records from primary to secondary name server

20
Q

ptr records

A

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

21
Q

txt record

A

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

22
Q

srv record

A

service record

specify a host and port for a specific service

23
Q

ns record

A

name server record

indicate which dns server is the authoritative one for a domain

24
Q

external dns

A

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

25
Q

dns resolver

A

aka dns cache on local machine

26
Q

iterative lookup

A

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

27
Q

recursive lookup

A

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

28
Q

stratum

A

levels of for network time protocol

up to 15