Network Naming Flashcards
DNS
Domain Name System
DNS Root Servers
Bunch of powerful computers dispersed around the world for DNS
TLD
Top Level domains; which include .com .gov .int .eu .us etc.
Second Level DNS
These are just below TLD’s and can handle personal computers/servers.
What type of namespace do host files use?
Flat name space
Flat name Space
One big undivided list containing all name, with no grouping
Hierarchical Name space
Enables admins to give networked systems longer more fully descriptive names.
FQDN
Fully Qualified Domain Name
DNS zone
A container for a single domain that gets filled with records
Record
A line in the zone data that maps an FQDN to an IP address
Cached Lookups
all the ip addresses it has already resolved
Forward Lookup zones
The IP addresses and FQDN’s for all computers in a domain are stored here
SOA
Start of Authority records that defines the primary name server in charge of the forward lookup zone
NS Record
Shows the primary name server
CNAME Record
Canonical Name Record, acts like an Alias.
AAAA Record
Equivalent to A records but used for IPv6 addressing
MX Record
Used Exclusively by SMTP Servers to determine where eto send mail
SRV Record
Generic DNS records that supports any type of server
Basic format of an SRV record
Service Proto name TTL Priority Weight Port Target
Services that use SRV
Kerberos servers, LDAP, SIP
Primary Zones
Created on DNS servers to act as primary name server for that zone
Secondary zones
Created on other DNS servers to act as backups to the primary zone
Reverse Lookup Zone
Does the exact reverse and find the FQDN using the IP address
PTR
Pointer Record which is used in Reverse lookup zones to add a unique domain to create in the zone “in-addr.arpa”
DDNA
Dynamic DNS which enabled DNS servers to get auto updates of IP addresses of computers in their forward lookup zones
DNSSEC
DNS Security Extensions, protocol designed to prevent bad users from impersonating legit DNS servers.
IPAM
IP address management; a DHCP server and DNS server working together to administer IP addresses,
nslookup command
You can query all types of information from a DNS server and change how your system uses DNS.
