CH9

Question 1

What is DNS

Answer 1

(domain name system) protocol that supports name resolution on networks (ip address -> name)

Question 2

what is NetBIOS

Answer 2

MS comp naming convention in 1980’s, used broadcasts for name resolution, only suitable for small networks relies on MAC Address, not routable

Question 3

what is NetBT

Answer 3

msoft own name res protocol, win used netbt for local network (shared printer, shared files, ) dns for everything else,

Question 4

What is SMB

Answer 4

(server message block) - ran on top of netbt to support file sharing, not dependant on netbios, runs on port 445

Question 5

SMB Port?

Answer 5

445

Question 6

whats a hosts file?

Answer 6

file containing ip address for every computer on the network

Question 7

DNS root server

Answer 7

root dns servers, dispersed around the world, delegate to TLD servers

Question 8

TLD servers (top level domain)

Answer 8

.com, .org, .net, .edu, .gov, .mil, .int, .us, .eu, deligate to domain specific name servers such as (google.com, microsoft.com,) these servers are called authoritative name servers

Question 9

domain specific name servers (authoritative name servers)

Answer 9

(google.com, microsoft.com,) these servers are called authoritative name servers

Question 10

name servers

Answer 10

hold actual name & IP (DNS records) in database called (zone)

Question 11

resolvers

Answer 11

query name servers w/a name to gets its IP address

Question 12

hierarchial structure type

Answer 12

tree

Question 13

FQDN - (fully qualified domain name)

Answer 13

complete DNS name including host name & all domains in order.
name servers

Question 14

record

Answer 14

attaches picece of data to name in DNS tree such as IP address,

Question 15

zone

Answer 15

container for single domain, filled w/records

Question 16

zone transfer

Answer 16

primary server gets new record, each secondary server updates

Question 17

recursive lookup

Answer 17

client sends resolver a queary the resolver will query other severs w/FQDN and respond to query

Question 18

iterative lookup

Answer 18

client itself resolves a FQDN

Question 19

AD (active directory)

Answer 19

directory service in win networks w/win servers, creates organization of related comps that share one or more win domains

Question 20

dns caching

Answer 20

temp storing info about dns lookup

Question 21

ttl (time to live)

Answer 21

field on every dns record (seconds dns resolvers should hold records in cache)

Question 22

DNS record types (9)

Answer 22

SOA (start of authority) - all zones require SOA record, defines primary ns in charge of zone
NS (name server) - shows primary name server
A - (address) - IPv4 address of a host
AAAA (quad a) - IPv6 address of a host
CNAME - alias holding FQDN
PTR - reverses a or aaaa, ip address to FQDN
MX - SMTP uses mx to determine where to send mail,
SRV (service) - supports any type of server
TXT - freeform , can be used for anything.

Question 23

DDNS (dynamic DNS)

Answer 23

dns servers get auto updates of ip addresses of comps in their forward lookup zones, by talking to local dhcp server.

Question 24

ipconfig /registerdns

Answer 24

force win client to update its records on AD

Question 25

(DNSSEC) DNS security extensions

Answer 25

auth/integrity protocol to prevent peeps from impersonating legitimate DNS servers

Question 26

EDNS

Answer 26

extension mechanism for dns trouble shoot dns on clients ipconfig /flushdns - delete dns cache ping - google.com (172.27.11.206) (see if FQDN is resolved into IP address) dig (domain information grouper) - unix/linux command, similar to nslookup, non-interactive

Question 27

ipconfig /all

Answer 27

confirm dns settings

Question 28

ipconfig /displaydns

Answer 28

shows dns cache

Question 29

reverse lookup

Answer 29

dns can convert ip address to name

Question 30

forward lookup

Answer 30

standard lookup (name -> ipaddress)

Question 31

resover cache

Answer 31

mem area that stores recenty resolved addresses