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chinese dumps ccna 200-125.Authentication Target 16.0416.4 Remote Access to IDS DevicesIn many cases, it is not possible to sit in front of an IOS device and manage it. In this case it is possible to manage it remotely: access the CLI remotely via Telnet or SSH, or use a web browser to manage it via the GUI. To access the CLI of an IOS device remotely, its Virtual Type Terminal (VTY) must be configured, as discussed in Chapter 10. If you are accessing a Layer 2 IOS switch, you need to assign an IP address to a VLAN interface (discussed in Chapter 11); if you are accessing a router, you need to assign an IP address to an interface and enable the interface (discussed in Chapter 15). On a router, only Telnet is enabled by default, and this section discusses how to enable SSHoA common method of accessing the console remotely is to connect the console ports of IOS devices to a terminal server and then access them through the terminal server. To do this, you need to log in to the Terminal Server first: through its console line; or remotely through SSH or Telnet. Then, you can access the console port of the IOS device directly to manage it. Many IOS routers support multi-port asynchronous cards that can be used as terminal servers: I often use Cisco servers as terminal servers. ~Chapter 16 Managing IOS Devices 39916.4.1 SSH Access and Telnet AccessFor remote management of devices, one of the most common tools used by network administrators is the Telnet application. Telnet gives you access to the device's CLI, but the problem is that all information between you and the IOS device is transmitted in clear text, including the user name and password. You don't want someone eavesdropping on the connection to see everything you do - logging in, seeing what the device is doing, and configuring the device - so you want to encrypt the traffic.The easiest way to do this is to use SSH (Secure Shell) instead of Telneto SSH uses the encryption algorithm RSA to encrypt the data that is transmitted between you and the network device. On IOS devices, SSH is disabled by default.Telnet sends traffic in clear text and is vulnerable to eavesdropping attacks To secure remote access to the IOS device and prevent you from being snooped on while entering commands and viewing configuration, use SSH to establish a remote access terminal connection: SSH encrypts the traffic. To protect the IOS device from access attacks, be sure to use SSH to access the device and use access control lists to restrict administrative access to the device (specify the IP addresses from which the device can be managed)16.4.2 Configuring SSH