CNIT 34220 Exam 1 Latest Update with Verified Solutions

CNIT 34220 Exam 1 Latest Update with Verified Solutions 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) Hmain(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 (, ) 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 fi