An engineer is configuring SSH version 2 exclusively on the R1 router. What is the minimum configuration required to permit remote management using the cryptographic protocol?
A.
hostname R1 service password-encryption crypto key generate rsa general-keys modulus 1024 username cisco privilege 15 password 0 cisco123 ip ssh version 2 line vty 0 15 transport input ssh login local
B.
hostname R1 ip domain name cisco crypto key generate rsa general-keys modulus 1024 username cisco privilege 15 password 0 cisco123 ip ssh version 2 line vty 0 15 transport input ssh login local
C.
hostname R1 crypto key generate rsa general-keys modulus 1024 username cisco privilege 15 password 0 cisco123 ip ssh version 2 line vty 0 15 transport input ssh login local
D.
hostname R1 ip domain name cisco crypto key generate rsa general-keys modulus 1024 username cisco privilege 15 password 0 cisco123 ip ssh version 2 line vty 0 15 transport input all login local
So before generating a RSA key, always remember you'll need a hostname and ip domain name. Then only you can create a RSA key(yes password isn't a requirement initally) which leaves us with answer B and answer D.
Moving on, the question asks to permit remote management(vty lines basically) using a cryptographic protocol thus we don't want to allow anyone in right? so we set a boundary to only allow what we want and that is SSH(cause by default telnet is included if we use transport input all) so that leaves us with answer B.
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