CNIT 34220 Exam 1|Complete
Questions and Answers
Name resolution - -map station names back to IP addresses
- Host files - -common to both DNS host names
- DNS - -hierarchical naming system
- Static - -DNS is traditionally a __________ approach (Hard coded list of
names and IP Addresses,
Assumes a station always has the same IP Address, Works well with Manual
or BOOTP, but not with DHCP)
- Host.subdomain(s).top_level_domain - -DNS namespace structure
- 127, 63 - -Domains have up to _____ levels, _____ characters per domain
- Authority - -______________ is handed down from top level to lower levels
- Inter Nic - -manages the top level (root) domains (edu, com, gov, mil, etc.)
- Domains - -map back to the names used in the DNS hierarchy
(purdue.edu, net.lcl)
- Zones - -represent the methods used to manage domains
- authoritative - -A zone is __________________ for a domain or subdomain
- 2 - -Each second level domain must have at least ______ authoritative DNS
servers
- Authoritative server - -contains actual DNS entries, must be up 24/7
- Next higher level's configuration - -where the address for the authoritative
server is listed
- 13 - -number of root name servers around the world
- Recursive and iterative - -the two approaches to forward name resolution
- Recursive - -approach to forward name resolution, an end node (resolver)
sends a request to the name server is obligated to supply an IP address for a
DNS name
, - Iterative - -approach to forward name resolution, when the name server
consults the root hints file, and it is pointed to the authoritative server
- name servers - -Resolved names are cached by _______________
- TTL - -the amount of time that a server can hold the cached data is
determined by
- Zone administrator - -who sets the TTL
- DNS Zone Files - -file for each zone containing records
- SOA (Start of Authority) - -DNS zone file, states that this is the definitive
name server for the domain, uses a '.' Instead of an '@' for email
- NS - -DNS zone file, name server in the domain, identifies the name
servers that are authoritative for the zone, useful for backups, needs the
FQDN of the zone and FQDN of the name server
- A(ddress) Record - -DNS zone file, provides IP address of for each of the
hosts that you want to make accessible via DNS
- MX Record - -DNS zone file, mail exchange, indicates that mail addressed
to a domain name should be forwarded to another host, identify the mail
server for a domain
- HINFO - -DNS zone file, host info record, machine type, operating system,
serial number
- WKS (well-known service record) - -DNS zone file, address, protocol, and
service provided by a host
- CNAME (Canonical Name) Record - -DNS zone file, stores nickname for a
host, creates an alias for a FQDN
- TXT - -DNS zone file, documentation file
- Reverse DNS Resolution - -allows the DNS name of a known IP address to
be resolved
- In-addr-arpa - -where information on IP address in reverse order are stored
- PTR records - -opposite of an A record, stores the FQDN for an IP address
(in reverse order)
Questions and Answers
Name resolution - -map station names back to IP addresses
- Host files - -common to both DNS host names
- DNS - -hierarchical naming system
- Static - -DNS is traditionally a __________ approach (Hard coded list of
names and IP Addresses,
Assumes a station always has the same IP Address, Works well with Manual
or BOOTP, but not with DHCP)
- Host.subdomain(s).top_level_domain - -DNS namespace structure
- 127, 63 - -Domains have up to _____ levels, _____ characters per domain
- Authority - -______________ is handed down from top level to lower levels
- Inter Nic - -manages the top level (root) domains (edu, com, gov, mil, etc.)
- Domains - -map back to the names used in the DNS hierarchy
(purdue.edu, net.lcl)
- Zones - -represent the methods used to manage domains
- authoritative - -A zone is __________________ for a domain or subdomain
- 2 - -Each second level domain must have at least ______ authoritative DNS
servers
- Authoritative server - -contains actual DNS entries, must be up 24/7
- Next higher level's configuration - -where the address for the authoritative
server is listed
- 13 - -number of root name servers around the world
- Recursive and iterative - -the two approaches to forward name resolution
- Recursive - -approach to forward name resolution, an end node (resolver)
sends a request to the name server is obligated to supply an IP address for a
DNS name
, - Iterative - -approach to forward name resolution, when the name server
consults the root hints file, and it is pointed to the authoritative server
- name servers - -Resolved names are cached by _______________
- TTL - -the amount of time that a server can hold the cached data is
determined by
- Zone administrator - -who sets the TTL
- DNS Zone Files - -file for each zone containing records
- SOA (Start of Authority) - -DNS zone file, states that this is the definitive
name server for the domain, uses a '.' Instead of an '@' for email
- NS - -DNS zone file, name server in the domain, identifies the name
servers that are authoritative for the zone, useful for backups, needs the
FQDN of the zone and FQDN of the name server
- A(ddress) Record - -DNS zone file, provides IP address of for each of the
hosts that you want to make accessible via DNS
- MX Record - -DNS zone file, mail exchange, indicates that mail addressed
to a domain name should be forwarded to another host, identify the mail
server for a domain
- HINFO - -DNS zone file, host info record, machine type, operating system,
serial number
- WKS (well-known service record) - -DNS zone file, address, protocol, and
service provided by a host
- CNAME (Canonical Name) Record - -DNS zone file, stores nickname for a
host, creates an alias for a FQDN
- TXT - -DNS zone file, documentation file
- Reverse DNS Resolution - -allows the DNS name of a known IP address to
be resolved
- In-addr-arpa - -where information on IP address in reverse order are stored
- PTR records - -opposite of an A record, stores the FQDN for an IP address
(in reverse order)
