Explaining Network Services Flashcards
Protocol used to automatically assign IP addressing information to hosts that have not been configured manually
Dynamic Host Configuration Protocol (DHCP)
Range of consecutive IP addresses in the same subnet that a DHVP server can lease to clients
Scope
DHCP configuration that assigns either a pre reserved or persistent IP address to a given host based on its hardware address or other ID
Reservation
Configuration of a router to forward DHCP traffic where the client and server are in different subnets
DHCP relay
Command set in a router OS to support DHCP relay and other broadcast forwarding functionality
IP Helper
Label applied to a host computer that is unique on the local network
Host name
Unique label specified in a DNS hierarchy to identify a particular host within a sub domain within a top level domain
Fully Qualified Domain Name (FQDN)
Service that maps fully qualified domain name labels to IP addresses on most TCP/IP networks including the internet
Domain Name System (DNS)
DNS query type whereby a server responds with information from its own data store only
Iterative lookups
DNS query type whereby a server submits additional queries to other servers to obtain the requested information.
Recursive lookup
Data file storing information about a DNS zone. The main records are as follows: A (maps a host name to an IPv4 address), AAAA (maps to an IPv6 address), CNAME (an Alia’s for a host name), NX (the IP address of a mail server), and PTR (allows a host name to be identified from an IP address).
Resource records
DNS server designated by a name server record for the domain that holds a complete copy of zone records
Authoritative name server
DNS query type to resolve an IP address to a host name.
Reverse DNS
Mechanism by high a secondary name server obtains a read only copy of zone records form the primary server
Zone transfer
Amount of time that the record returned by a DNS query should be cached before discarding it
Time to live (TTL)
