Which two of these elements need to be configured prior to enabling SSH? (Choose two.)

A.
hostname

B.
loopback address

C.
default gateway

D.
domain name

E.
SSH peer address

Explanation:
To enable Secure Shell (SSHv2) version 2 (disable version 1) on a Cisco router an IOS with 3des encryption is required.

When there is no SSH version configured, version 1 and 2 will be supported both.

Follow the next steps to enable SSH:
Configure the hostname command.
Configure the DNS domain.
Generate RSA key to be used.
Enable SSH transport support for the virtual type terminal (vty)

Example SSH version 2 configuration:

hostname ssh-router
aaa new-model
username cisco password cisco
ip domain-name routers.local

! Specifies which RSA keypair to use for SSH usage.
ip ssh rsa keypair-name sshkeys

! Enables the SSH server for local and remote authentication on the router.
! For SSH Version 2, the modulus size must be at least 768 bits.
crypto key generate rsa usage-keys label sshkeys modulus 768

! Configures SSH control variables on your router.
ip ssh timeout 120

! configure SSH version 2 (will disable SSH version 1)
ip ssh version 2

!— disable Telnet and enable SSH
line vty 0 4
transport input SSH

Commands to verify SSH configuration:
show ssh
show ip ssh
debug ip ssh