DNS Flashcards
All about DNS
What does DNS stand for?
Domain Name System
Which devices can cache DNS information?
Clients and Servers
DNS can be used by a client to locate a Domain Controller for authentication services. True or False?
True.
What command is used to display all cached DNS entries on a DNS client?
Ipconfig /displaydns
What command is used to remove all cached DNS entries on a DNS client?
Ipconfig /flushdns
What does NAT stand for?
Network Address Translation
What is the purpose of NAT?
To allow devices on a private network to communicate on the public internet by translating private IP addresses.
What is a DNS forwarder?
A DNS server that sends unresolved DNS queries to another specified DNS server.
What are two ways to install the DNS server role on Windows Server 2016?
Through the “Add Roles and Features Wizard” in Server Manager or with the “Add-WindowsFeature DNS -IncludeManagementTools” command in Windows Powershell.
What command is used to show cached DNS entries from the DNS server?
Show-DnsServerCache
What command is used to remove all cached DNS entries from a DNS server?
Clear-DnsServerCache
What does an “A” RecordType signify in the results screen of a Show-DnsServerCache command?
An “A” record signifies an IPv4 address.
What configuration allows two DNS servers to send requests between each other?
DNS Forwarding
What two methods can you use to configure a DNS forwarder?
Through DNS manager as well as through PowerShell using the “Add-DnsServerForwarder (ip address)” command.
What methods can use you use to configure conditional forwarding?
Through DNS Manager or through PowerShell using the “Add-DnsServerConditionalForwarderZone (domain) (ip address)” command
Which type of DNS query involves a single request by a client expecting a resolution of a fully qualified domain name?
A recursive query
What is the name of the file that contains the root hints on Windows 2016?
Cache.DNS
Which PowerShell command adds a new DNS Server Root Hint?
Add-DnsServerRootHint (domain) (ip address)
Tree walking won’t occur when making a DNS request for www.google.com because of what?
The resolution is cached on either the server or the client.
What two methods are used to remove a DNS forwarder?
Through DNS Manager or through PowerShell using the “Remove-DnsServerForwarder (ip address)” command.
What PowerShell command is the equivalent to an “ipconfig /flushdns” command?
Clear-DnsClientCache
What are the different methods to modify DNS Root Hints?
Through the CACHE.DNS file, through DNS Manager, or through Powershell.
What is the path to get to the CACHE.DNS file?
C:\Windows\System32\dns
What are the stages of name resolution on a Windows 10 or Windows Server 2016 computer?
- Determine whether the queried host name is the same as the local host name.
- Search the local DNS resolver cache for the queried host name.
- Petition the DNS server for the required host name
What are the installation requirements for the DNS server role?
Security: Must be signed in as the local Administrator of the server
IP Configuration: The server must be configured with static IPs.
What is Response Rate Limiting (RRL)?
Mitigates the possibility of malicious systems using your DNS servers to initiate a DoS attack on a DNS client.
What is the name of the DNS Debug log and when can it be open?
dns.log. Can only be opened when the DNS server service has stopped.
Linux DNS servers can also have Active Directory-integrated zones. True of False?
False. Linux DNS servers do not support AD-integrated zones. Their IPs would have to be added for zone transfers in the primary zone’s zone properties.
Zone transfers are always initiated by requests sent by primary DNS servers? True or False?
False. Zone transfer requests are initiated by secondary DNS servers.
When configuring a Conditional Forwarder to replicate, which replication option is used if there are pre-Windows 2003 domain controllers present in the network?
Replicate to “All domain controllers in this domain”
