1.8

Question 1

What does DNS stand for and what does it do?

Answer 1

Domain Name System, It translates human readable names into computer readable IP addresses.

Question 2

T/F) DNS is not Hierarchical.

Answer 2

False, It follows a specific path.

Question 3

What is an Internal DNS?

Answer 3

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

Question 4

Whats an External DNS?

Answer 4

It doesnt have an internal device info. and its managed by a third party. EX: Google DNS, Quad9

Question 5

Whats a third party DNS?

Answer 5

Third-party DNS means that another organization is responsible for hosting your DNS records.

Question 6

What are DNS records?

Answer 6

Its a database records of domain name services called Resource Records or RR.

Question 7

What are A and AAAA address records?

Answer 7

They define the IP address of a host but A records are for IPv4 and AAAA records are for IPv6 addresses.

Question 8

Whats CNAME?

Answer 8

Canonical name records is a DNS record of a name that is an alias of another, canonical name, one physical server, multiple services

Question 9

Whats SRV?

Answer 9

(Service records) is used to find a specific service.

Question 10

Whats MX?

Answer 10

(Mail Exchange Record) DNS record which determines the host name for the mail server.

Question 11

Whats NS?

Answer 11

(Name Server Records) They list the name servers for a domain.

Question 12

Whats PTR?

Answer 12

(Pointer Record) Its the reverse of an A or AAAA record

Question 13

Whats TXT and what is TXT used for?

Answer 13

(Text records) Human-readable text info.

1. SPF protocol (Sender Policy Framework) to prevent mail spoofing.
2. DKIM (Domain Keys Identified Mail) to digitally sign your outgoing mail.

Question 14

What is DHCP?

Answer 14

(Dynamic host configuration protocol) It’s the primary and automatic configuration protocol for IP version 4.

Question 15

Whats DHCP relay?

Answer 15

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)

Question 16

What is IPAM?

Answer 16

(IP Address Management) It manages IP addressing and gives reports on IP address usage. It also controls DHCP reservations.

Question 17

Whats a DHCP pool?

Answer 17

It the grouping of IP addresses in a DHCP server Each subnet has its own pool.

Question 18

What is MAC reservation?

Answer 18

(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.

Question 19

Whats IP exclusion?

Answer 19

Statically assigned addresses can be excluded from the DHCP pool. This process is called IP exclusion.

Question 20

What is lease time?

Answer 20

It is the amount of time in minutes or seconds a network device can use an IP Address in a network.

Question 21

When does the renewal timer and rebuilding timer start?

Answer 21

Renewal Timer (T1) starts at 50% and Rebuilding Timer starts at 87.5% of the lease time.

Question 22

What is TTL?

Answer 22

(Time To Live) Amount of time for an IP being leased.

Question 23

What is NTP?

Answer 23

(Network Time Protocol) It syncs clocks and automatically updates based on how user wants it to be updated.