whats the point of putting a domain name on a router with dns ?

[dolanduck.]

for example, lets lets say i make a router a dns server whats the point of putting a domain name like dns.com and a list of other names with ip domain-list command. why ?

[balaji.bandi]

"ip domain name" specifies the domain name of the cisco device itself. One of the things this is used for is security certificate generation for IPSEC, SSH or HTTPS access. The certificate will be generated using the entries you put in for hostname and domain name.

https://www.cisco.com/c/en/us/support/docs/ip/domain-name-system-dns/24182-reversedns.html

[dolanduck.]

so would i use the the same dns name for dhcp ?

[balaji.bandi]

DNS you need to have FQDN, to resolve the Internet naming.

if the domain name is FQDN, you can do that.

[Georg Pauwen]

Hello,

one thing you need the domain name for is to generate an RSA key for SSH. The RSA key will be the hostname followed by the configured domain name:

Switch(config)#hostname Switch1

Switch1(config)#ip domain-name mydomain.com

Switch1(config)# crypto key generate rsa
The name for the keys will be: Switch1.mydomain.com