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Linux 3 - midterm

Mostly DNS Information

Domain Name Space hierarchical addressing scheme to identify host using the FQDN
DNS database data stores of resource records stored in zone files
Client/server protocol protocol that allow client and server to communicate on port 53 (UDP + TCP)
Resolver software that queries name servers on behalf of applications requiring host name resolution
Name Server server software to manage domain name space, respond to queries (BIND)
Root domain start of the name space, shown as a period "." Root domain DNS only give referral answers.
TLD Top Level Domain, first level domain (org, com, net). TLD DNS only give referral answers.
gTLD generic TLD (3 letter ones)
ccTLD country code TLD (2 letter codes like ca)
Second-level domain SLD, domain registered by organization or individual.
Host hostname, unique within a domain
FQDN Fully Qualified Domain Name, uniquely identifies host within a global domain name space.
Cuts Divide domain name space into segments
Zone of authority group of hosts that fall under one zone
Resource records like A, glue, PTR, NS, etc.
Forward Resolution have a name, need an IP
Reverse resolution have an IP, want a name
Delegation delegates authority of a name server to a zone below
Glue Record an A record for for the name server that is authoritative to the delegated zone
Caching Name Server All successful queries performed by a recursive name server is cached. Faster + Less Bandwidth but may have stale info.
TTL Time to live, set by the authoritative name server.
Authoritative Answer Given by authoritative name server
Non-authoritative Answer Comes from preferred name servers cache
Referral Answer Provides delegation information, root and TLD servers only give out referrals.
Recursive Query Name server will keep asking to get the answer. Normally client asks preferred name server to do this.
Iterative Query Name server performs these to multiple other name servers down the hierarchy to answer a recursive query.
Master or Primary Server Can accept changes to the zone data
Slave or Secondary Server only receives data from master server through zone transfers
Caching-only Name Server authoritative to no one, performs recursive requests and caches results
Forwarding Name Server can be authoritative or not, forwards recursive requests to other servers and caches results for local clients.
SOA Entries 1(Serial#) 2(refresh) 3(retry) 4(expire) 5(minimum TTL)
Created by: Datheral