Network Services/ DNS Records Flashcards

1
Q

Dynamic Host Configuration Protocol (DHCP)

A

o Assigns devices with IP addresses and also provides them a subnet mask, default
gateway, and DNS server
o Operates over ports 67 and 68 using UDP

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2
Q

Domain Name System (DNS)

A

o Converts domain names to IP addresses using a hierarchical and decentralized
system of naming
o Operates over UDP and TCP using port 53

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3
Q

Zone Transfer

A

Sharing of information between DNS servers about which domain names they
have and their associated IP addresses

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4
Q

Network Time Protocol (NTP)

A

o Synchronizes clocks between systems communicating over
o a packet-switched, variable-latency data network
o Sent over UDP using port 123

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5
Q

Dynamic Host Configuration Protocol (DHCP) Part 2

A

o DHCP also help eliminate configuration errors
▪ Each device will automatically get assigned an IP from a scope
● Scope
o A list of valid IP addresses that are available for
assignment or lease to a client computer or endpoint
device on a given subnet
▪ Use a DHCP reservation
▪ DHCP server will acknowledge the IP that is being used
o D-O-R-A process
▪ Discover, Offer, Request and Acknowledge
If a device attempts to use DHCP and fails to receive its configuration, what
should it do?
▪ It is set to use an APIPA address, or automatic private IP address
o DHCP Relay
▪ Any host that forwards DHCP packets between clients and servers
o DHCP is that it operates using the User Datagram Protocol or UDP
o If the DHCP client and server are on different network segments, the router on
the client’s network segment must be configured with an IP helper address for
DHCP to work properly

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6
Q

Domain Name System (DNS) EX

A

o Used to help your network clients find a website using human-readable
hostnames instead of numeric IP addresses
o Converts names to numbers and numbers to names
▪ Fully Qualified Domain Name (FQDN)
● This is when a domain name is under a top-level provider
● The most common top-level provider:
o .com
o .mil
o .edu
o .org
o .net

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7
Q

Root Level

A

The highest level in the DNS hierarchy tree and the root name server
answers requests in the root zone
▪ These servers contain the global list of all the top-level domains, such as
.com, .net, .org, .mil, and others

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8
Q

Top-level Domains

A

▪ Organizational hierarchy
● .com
● .net
● .org
▪ Geographic hierarchy
● .uk for the United Kingdom
● .fr for France
● .it for Italy

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9
Q

Second-level Domains

A

These domains site directly below the top-level domain
● For example: diontraining.com is a second level domain, and it
sits underneath the top-level domain of .com

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10
Q

Sub-domain

A

▪ A new server underneath a second-level domain

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11
Q

Host Level

A

This is the lowest and most detailed level inside of the DNS hierarchy and
refers to a specific machine

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12
Q

A Records

A

▪ Address Record
▪ Used to link a hostname to an IPv4 address
▪ A records work for IPv4 addresses
▪ AAAA records work for IPv6 addresses

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13
Q

CNAME Record

A

▪ Canonical Name Record
▪ Used instead of a A record or AAAA record if you want to point a domain
to another domain name or subdomain

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14
Q

MX Record

A

▪ Mail Exchange Record
▪ Used to direct emails to a mail serve
▪ Used to indicate how email messages should be routed using the Simple
Mail Transfer Protocol, or SMTP, over port 25
▪ Can only be used to point to another domain, not an IP address

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15
Q

SOA Record

A

▪ Start of Authority Record
▪ Used to store important information about a domain or zone

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16
Q

DNS zone transfer

A

The process of sending DNS records data from the primary nameserver to
a secondary name server
▪ Uses the TCP protocol to transfer the data to ensure data is successfully
sent by the primary server and received by the second server

17
Q

PTR Records

A

▪ Pointer Records
▪ Used to correlate an IP address with a domain name
▪ The opposite of an A record
▪ Always stored under the .arpa (top-level domain)

18
Q

TXT Record

A

Text records
▪ Used by domain administrators to add text into the domain name system
or DNS
▪ A place to store machine-readable data

19
Q

SRV Records

A

▪ Service Record
▪ Used to specify a host and port for a specific service
▪ Can specify a port along with our IP address

20
Q

NS Record

A

▪ Name Server Record
▪ Used to indicate which DNS name server is the authoritative one for a
domain

21
Q

External DNS

A

Records created around the domain names we purchase from a central
authority and use on the public internet

22
Q

DNS Resolver

A

Also known as a DNS cache located on an individual host
▪ This temporary database remembers the answers it received from the
DNS server
● Recursive Lookup
o DNS server will hunt it down and report back to your
resolver
● Interactive lookup
o DNS resolve will continually query DNS servers until it finds
the one with the IP for the domain

23
Q

Network Time Protocol (NTP)

A

o Synchronizes clocks between systems communicating over a packet-switched,
variable-latency data network
o Sent over UDP using port 123
▪ Stratum
▪ Clients
▪ Servers
o NTP can handle a maximum of 15 stratum levels

24
Q
A