SSHCommandLineandAdvancedClientUse·Chapter11 253 The ­A and ­a options are used with agent forwarding. This is a process that allows applications on the SSH server to access the SSH client. The ­A option turns on this feature, and the ­a option turns it off. This feature is primarily used with PKI authentication and storage of the keys in a local repository so that the server can access them as you open other applications through your PuTTY SSH session. To open a PuTTY SSH session with compression, you can use the ­c option. To specify a specific release of SSH, version 1 or 2, you can use the -1 or -2 options (Figure 11.18), respectively. In addition, to specify a private key, you would use the ­i command. Figure 11.18 PuTTY SSH Session Forcing SSH Version 1 with the -1 Option