TCP/IP 8

Name server (NS) record

DNS resource record that identifies name servers that are authoritative

Pointer (PTR) record

a DNS resource record that is used for inverse lookups to map IP addresses to domain names

Address (A) record

a DNS resource record that maps IPv4 to hosts within a domain

AAAA record

a DNS resource record that maps IPv6 addresses to hosts within a domain

Caching server

a DNS server that stores valid name and address pairs already looked up, along with previously detected invalid names and addresses

Uniform resource identifier (URI)

a character string that is used to identify a resource on the Internet and includes URLs and URNs

Nslookup

a command-line program that supports DNS lookup and reporting capabilities

Distributed database technology

a database that is managed by multiple database servers, each of which has responsibility for some distinct portion of a global database

Stateless address autoconfiguration (SLAAC)

a mechanism where an IPv6 host creates its own addresses using a combination of locally available address data and information advertised by routers

Wait ACK (WACK)

a message sent by a network device such as a WINS server to acknowledge the receipt of a message and to direct the sending node to wait before sending more packets

DNS round robin

a method of managing server congestion in which a DNS server keeps track of which IP addresses it has provided most recently for a specific translation and rotates them within the pool/list of addresses available

IPv6 literal

a name for IPv6 addresses used on computers that do not recognize IPv4 address syntax

Universal naming convention (UNC) path

a naming format that points to the location of devices and resources on a network

Zone

a portion of the domain name hierarchy that corresponds to the database segment managed by some particular name server

Link-local multicast name resolution (LLMNR)

a protocol that provides name resolution services on local networks for IPv4 and IPv6 Windows computers

Authoritative response

a reply to a query from the name server that is authoritative for the zone in which the requested name or address resides

Fully qualified domain name (FQDN)

a special form of domain name that ends with a period to indicate the root of the domain name hierarchy

Negative caching

a technique for storing error messages in a local cache so that repeating a query that previously produced an error message can be satisfied more readily

Recursive query

a type of DNS query that continues until a definitive answer is forthcoming

Incremental zone transfer

a type of DNS query that limits updates from a primary DNS server to one or more secondary DNS servers only to data that has changed on the primary server

Name query

an inverse DNS query that seeks to obtain a domain name for a corresponding numeric IP address

Zone data file

any of several specific files used to capture DNS database information for static storage when a DNS server is shutdown or when a secondary DNS server requests synchronization with its primary DNS server's database

Multihomed

indicates a device containing multiple network interfaces capable of attaching to multiple subnets

MX record

mail exchange record

Delegation of authority principle

one name server designates another name server to handle some or all of the zones files for the domain or subdomains under its purview

Resource record (RR)

one of a series of predefined record types in a DNS database or a DNS zone file

Inverse DNS query

supplies an IP address for conversion to a corresponding domain name. This is often used to double check identities against their packet headers

Iterative query

targets one specific DNS server and terminates with whatever response may be forthcoming. Examples: definite answer, error message, null, etc.

Canonical name (CNAME) record

the DNS RR (round robin) used to define database aliases. This provides faster & easier editing and managing of DNS zone files

Start of authority (SOA) record

the DNS resource record that is mandatory in every DNS zone file. It identifies servers that are authoritative for the domain/subdomain to which the zone files or databases correspon

The domain name hierarchy

the entire global namespace for the domain names that DNS manages on the Internet