Assignmet 9 - DNS Flashcards
- What components is a typical DNS name made up of?
A FQDN consists of:
Top Level Domain such as .com, .gov, .edu,
second-level domain name that usually identifies the organization/
subdomains such as departments
host portion that identifies the object within that domain.
- What is a Fully Qualified Domain Name (FQDN?
A FQDN represents a completely mapped name for a user, computer, or any object within the domain. It represents a hierarchical naming structure used primarily by DNS to resolve names to IP addresses for resource lookups.
- What would be the FQDN for a host called PRTSRV1 located in the Electronics Department (ELEX) at Camosun College (CAMOSUN) within the BC Government (BC) in Canada (CA)?
FQDN would be Printserv1.elex.camosun.bc.ca
- What is an Authoritative Server?
An Authoritative Server is a DNS server that has a full, complete copy of all records for a particular zone.
- Describe the steps involved in resolving a DNS name resolution (recursion process).
Recursion is the process by which DNS name resolution occurs. In general, a host or server requests a name resolution and if not known by a local DNS service is passed on to subsequent DNS services until a name resolution is determined or timed out.
The following steps are usually followed when a host requires name resolution: Check the local cache first, check the Hosts file, contact preferred DNS server, contact additional DNS servers, DNS server contacts a Root Server, Root Server sends information to DNS server, DNS server then checks the next highest domain, etc until the name is resolved or not found.
- What are root hints and when would they be used?
Root Hints are used when forwarding fails a name resolution to query a root server for possible name resolution. Root Servers are located at the top of the DNS structure and have a broader knowledge of names and name resolution.
- What DNS zone is used specifically for single-label names?
The GlobalNames zone is used for single-label names.
- What are the three types of authoritative DNS zones?
Primary
Secondary
Active Directory-integrated
- What is the difference between the Primary Zone and the Secondary Zone?
The Primary zone keeps a master copy of the zone database. It is the only writeable zone. A secondary zone is a read only copy of the zone database.
- What is the difference between a forward lookup zone and a reverse lookup zone?
A forward lookup zone resolves names to IP addresses, a reverse lookup zone resolves IP addresses to names.
- What are some of the common DNS Record types and representations?
SOA or Start of Authority identifies the DNS server that is hosting the primary zone.
NS record is used to identify a name server that can perform name resolution.
A record is used to identify an IPv4 address to host name mapping.
AAAA record is used to identify an IPv6 address to host name mapping.
MX record is used to identify a mail exchanger for SMTP mail.
- What is a CNAME record used for?
Canonical name record provides alternative names (aliases) to hosts that already have an A record. They are used to allow servers to be referred to by different names in DNS.
- What is WINS and what is it used for?
The Windows Internet Naming Service (WINS) is an older flat namespace naming service that was based upon NETBIOS names for identifying resources. For compatibility with older operating systems, DNS supports WINS for name resolution.
- What are some of the manageable options when accessing the DNS Manager?
The manageable options for DNS are identified by the following tabs: Interfaces, Forwarders, Root hints, Debug Logging, Event Logging, Monitoring, Security, and Advanced options.
- What are three common CLI tools when troubleshooting DNS?
Ping
NSLOOKUP
Ipconfig
