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Linux 3 - midterm
Mostly DNS Information
| Question | Answer |
|---|---|
| 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
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