Network+ DNS
What is the size of TCP headers?
20 bytes
What is the size of UDP headers?
8 bytes
What is a reverse lookup zone?
Hold PTR records, used to resolve IP into host name
What is DomainKeys Identified Mail (DKIM)?
Used to decide whether you should allow received email from a source, prevents spam and spoofing
What is Service (SRV)?
Used to identify a record that is providng a network service or protocol, media or VOIP
What is Mail Exchanger (MX)?
Used to identify an email server for a domain
What is Sender Policy Framework (SPF)?
Used to list the IP addresses or names of services that are allowed to send email, used against spam
What is CNAME records?
Used to represent an alias for a DNS name
What is Address (A)?
Used to resolve a host name to an IPv4 address
What is AAAA?
Used to resolve a host name to an IPv6 address
What is TXT Records?
Used to store any free form text, used in SPF and DKIM
Does TCP use flow control?
Yes
What is a forward lookup zone?
Contains most of the resources for IP addresses and DNS names
What is the nmap command?
A command for scanning hosts and networks for scanning port, hosts, and networks
What is the netstat command?
A command that checks the host's ports
What is wireshark?
A protocol analyzer and a packet sniffer
What is a top level domain?
A root domain server
What is nslookup?
DNS lookup for DNS info
What is external DNS?
Domains that refer to records that internet clients can access
What is internal DNS?
Domains used inside private networks only
What is dynamic DNS?
Dynamically changes IP addresses to match DNS server
What is NS?
Name server, hold the DNS server
Does UDP use flow control?
No
What is Pointer (PTR)?
Reverse DNS lookup, security tool used for mail servers
What is IP Address Management (IPAM)?
Scans DHCP and DNS servers and logs IP address usage to a database
