1.8 Flashcards
What does DNS stand for and what does it do?
Domain Name System, It translates human readable names into computer readable IP addresses.
T/F) DNS is not Hierarchical.
False, It follows a specific path.
What is an Internal DNS?
It is managed on internal servers which has DNS info about internal devices and its maintained by local team. EX: DNS service on Windows Server
Whats an External DNS?
It doesnt have an internal device info. and its managed by a third party. EX: Google DNS, Quad9
Whats a third party DNS?
Third-party DNS means that another organization is responsible for hosting your DNS records.
What are DNS records?
Its a database records of domain name services called Resource Records or RR.
What are A and AAAA address records?
They define the IP address of a host but A records are for IPv4 and AAAA records are for IPv6 addresses.
Whats CNAME?
Canonical name records is a DNS record of a name that is an alias of another, canonical name, one physical server, multiple services
Whats SRV?
(Service records) is used to find a specific service.
Whats MX?
(Mail Exchange Record) DNS record which determines the host name for the mail server.
Whats NS?
(Name Server Records) They list the name servers for a domain.
Whats PTR?
(Pointer Record) Its the reverse of an A or AAAA record
Whats TXT and what is TXT used for?
(Text records) Human-readable text info.
- SPF protocol (Sender Policy Framework) to prevent mail spoofing.
- DKIM (Domain Keys Identified Mail) to digitally sign your outgoing mail.
What is DHCP?
(Dynamic host configuration protocol) It’s the primary and automatic configuration protocol for IP version 4.
Whats DHCP relay?
It’s also called IP helper, sends DHCP request across broadcast domain (Takes the broadcast, turns into a unicast so it can go through a router)
What is IPAM?
(IP Address Management) It manages IP addressing and gives reports on IP address usage. It also controls DHCP reservations.
Whats a DHCP pool?
It the grouping of IP addresses in a DHCP server Each subnet has its own pool.
What is MAC reservation?
(Also called IP reservation) A reservation is a mapping of a MAC address to a specific IP address within the DHCP server’s address pool.
Whats IP exclusion?
Statically assigned addresses can be excluded from the DHCP pool. This process is called IP exclusion.
What is lease time?
It is the amount of time in minutes or seconds a network device can use an IP Address in a network.
When does the renewal timer and rebuilding timer start?
Renewal Timer (T1) starts at 50% and Rebuilding Timer starts at 87.5% of the lease time.
What is TTL?
(Time To Live) Amount of time for an IP being leased.
What is NTP?
(Network Time Protocol) It syncs clocks and automatically updates based on how user wants it to be updated.
