7. Recognize Common Protocol Port Values (such as, SSH, Telnet, HTTP, HTTPS, and NETCONF) 200-901 Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A network engineer is troubleshooting a device that is not responding to management connections. The engineer checks the firewall and sees that ports 22, 23, and 830 are open. The device is configured to accept only encrypted management protocols and supports both SSH and NETCONF. The engineer is able to ping the device but cannot establish a management session. Which port is most likely the cause of the issue?

   • A22
   • B23
   • C830
   • DThe issue is not related to port numbers
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   A network administrator needs to connect securely to a router's CLI over an IP network. Which protocol and default port should be used?

   • ANETCONF on TCP port 830
   • BSSH on TCP port 22
   • CTelnet on TCP port 23
   • DHTTP on TCP port 80
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A network engineer is configuring a new management VLAN. The engineer must allow secure remote CLI access to network devices and also allow the devices to reach an internal web-based monitoring portal that does not use encryption. Which two TCP ports must be permitted in the ACL applied to the management VLAN?

   • A22 and 80
   • B23 and 80
   • C23 and 443
   • D22 and 443
   Reveal Solution Discussion Select an answer first
5. 9expert · hard

   A network administrator is migrating a legacy device from Telnet to SSH. The device is currently managed via Telnet from a management station. After enabling SSH on the device, the administrator attempts to connect via SSH but receives a 'connection refused' error. The administrator verifies that SSH is enabled and that the management station can ping the device. What is the most likely cause of the 'connection refused' error?

   • AThe firewall is blocking TCP port 22
   • BThe management station is using the wrong username
   • CThe device is not reachable via the network
   • DThe device does not support SSH
   Reveal Solution Discussion Select an answer first
6. 10expert · hard

   An automation platform is being configured to manage network devices using NETCONF. The platform also needs to perform backup operations using SFTP. The network team has confirmed that the devices support both protocols. Which two ports must be open on the firewall for the automation platform to function correctly?

   • A80 and 443
   • B23 and 830
   • C22 and 23
   • D22 and 830
   Reveal Solution Discussion Select an answer first