Purpose of configuring Domain Name in cisco Router and ASA

I have seen some examples where domain name is configured in Cisco Router or ASA Firewall.
I am not sure the purpose of it in real world.
Any idea?

Thanks
jskfanAsked:
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MattCommented:
If you want to access device using SSH, domain name is mandatory for creating keys (it generates them using FQDN (hostname + domain name)).
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jskfanAuthor Commented:
Which keys?
Do you have an example?

Thanks
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JustInCaseCommented:
!hostname cannot be default
Router(config)# hostname R1
!create user with password for login
R1(config)# username cisco secret cisco
!
R1(config)# ip domain-name my.net
R1(config)# crypto key generate rsa
!
How many bits in the modulus [512]: 1024
!
% Generating 1024 bit RSA keys ...[OK]
!
R1(config)# line vty 0 4
R1(config-line)# login local
R1(config-line)# transport input ssh

This will create crypto key.
Hostname of switch or router cannot be default, and domain must be created (as Matt already said).
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jskfanAuthor Commented:
In the LAB, I can create Switches and Routers without naming them and it still works as long as they have IP addresses on the interfaces.
As long as Domain name, I have not try to create one in the LAB
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JustInCaseCommented:
Switches and routers do their work without creating any domain (there is default domain), but one example why you need to create domain name other then default value is SSH. On routers, switches etc, default domain name is default.domain.invalid as you can see in documentation, in some cases (for specific purposes) host name and domain name cannot be at default values.
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jskfanAuthor Commented:
in some cases (for specific purposes) host name and domain name cannot be at default values.
- That's what I was trying to find out.  the purpose.
- does it have to match the company hosted domain ?
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jskfanAuthor Commented:
Thank you Guys
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