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