Network Services Flashcards
dhcp
dynamic host configuration protocol
assigns ip, subnet mask, default gateway, dns server
ports 67, 68
udp
dns
domain name system
convert domain name to ip
port 53
udp and tcp
zone transfer
sharing of info between dns servers about their records
ntp
network time protocol
syncs clocks between systems
port 123
udp
dhcp scope
a list of valid ip addresses that are available for assignment or lease
dora process
for dhcp
discover, offer, request, acknowledge
dhcp relay
any host that forwards dhcp packets between clients and servers
fqdn
fully qualified domain name
domain name is under a top-level provider like .com
ex: diontraining.com
root level
highest level in dns hierarchy tree
contain global list of all top-level domains for com/net/mil
it is the “.” in .com
top level domains
organizational: com/net/mil
geographical: uk/fr/it
second level domain
directly below top level
ex: diontraining in diontraining.com
sub-domain
a new server underneath second level
ex: store in store.dointraining.com
host level
lowest and most detailed level inside of dns hierarchy
refers to specific machine
a record
address record
link host name to ipv4
aaaa record
address record
link host name to ipv6
cname record
canonical name record
used instead of an a record to pint a domain to another domain
mx record
mail exchange record
direct emails to mail server
how emails should be routed using smtp port 25
soa record
start of authority record
used to store important info about a domain or zone
dns zone transfer
process of sending dns records from primary to secondary name server
ptr records
pointer records
correlate an ip address with a domain name
reverse a record
txt record
text record
add text to dns
can be used to prove ownership of dns server
srv record
service record
specify a host and port for a specific service
ns record
name server record
indicate which dns server is the authoritative one for a domain
external dns
records created around the domain names we purchased from a central authority and use on internet
dns resolver
aka dns cache on local machine
iterative lookup
dns client will continuously query dns servers until it finds the correct record
recursive lookup
dns will hunt it down and report back to you, makes requests on behalf of client
stratum
levels of for network time protocol
up to 15
