Network Services

Question 1

Zone transfer

Answer 1

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

Question 2

Network Time Protocol (NTP)

Answer 2

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

Question 3

Scope

Answer 3

A list of valid IP addresses available for assignment or least to a client computer or endpoint device on a given subnet

Question 4

DHCP Reservation

Answer 4

Excludes some IP addresses from being handed out to devices unless they meet a certain condition

Question 5

DHCP Relay

Answer 5

Forwards DHCP packets between clients and servers (only if not in the same subnet or network)

Question 6

IP Helper

Answer 6

Forwards several different kinds of UDP broadcasts across the router and can be used in conjunction with the DHCP relay

Question 7

Upon whom do we rely for DNS services?

Answer 7

Our ISPs

Question 8

what is the top level domain in DNS?

Answer 8

the .com part of the address

Question 9

What is the root level domain in DNS?

Answer 9

.com, .net, etc.

Question 10

Top-level domain

Answer 10

.com, .eu, etc.

Question 11

second level domain?

Answer 11

diontraining.com

Question 12

subdomain?

Answer 12

support.diontraining.com

Question 13

host level domain?

Answer 13

refers to a specific machine or device on the network

Question 14

A Record?

Answer 14

links a host name to an IPv4 address

Question 15

AAAA Record

Answer 15

links a hostname to an IPv6 address

Question 16

CNAME Record

Answer 16

canonical name; points a domain name to another domain name; point an old domain to a new one you started

Question 17

MX (Mail Exchange) Record

Answer 17

directs emails to a mail server

Question 18

Start of Authority (SOA) record

Answer 18

stores important information about a domain or zone; when it was last updated, very important for zone transfer (sends dns record data from the primary nameserver to a secondary nameserver)

Question 19

PTR Record

Answer 19

pointer record; correlates an IP address with a domain name

Question 20

TXT Record

Answer 20

Text; adds text into the DNS; mostly used to prove domain ownership, and spam prevention (like what we do with proofpoint)

Question 21

SRV Record

Answer 21

Service; specifies a host and port for a specific services

Question 22

NS Record

Answer 22

nameserver; indicates which DNS nameserver has the authority

Question 23

TTL (Time to Live)

Answer 23

Tells the DNS resolver how long to cache a query

Question 24

Recursive Lookup

Answer 24

DNS Server communicates with several other DNS servers to hunt down the IP address and return to the client

Question 25

Iterative Lookup

Answer 25

Your DNS resolver asks for IP, if not it asks the next server, and so on and so forth

Question 26

Network Time Protocol (NTP)

Answer 26

Synchronizes clocks between systems communicating over a packet-switched, variable-latency, data network; sent over UDP Port 123; important so we can all have the same time. Why so important? A lot of out security protocols rely on time to work