CCNA All in One

Question 1 Which command encrypts all plaintext passwords? A. Router# service password-encryption B. Router(config)# password-encryption C. Router(config)# service password-encryption D. Router# password-encryption Answer: C Question 2 What can be done to secure the virtual terminal interfaces on a router? (Choose two) A. Administratively shut down the interface. B. Physically secure the interface. C. Create an access list and apply it to the virtual terminal interfaces with the access-group command. D. Configure a virtual terminal password and login process. E. Enter an access list and apply it to the virtual terminal interfaces using the access-class command. Answer: D E Question 3 Refer to the exhibit. Why is flash memory erased prior to upgrading the IOS image from the TFTP server? Router# copy tftp flash Address or name of remote host []? 192.168.2.167 Source filename []? c1600-k8sy-mz.123-16a.bin Destination filename [c1600-k8sy-mz.123-16a.bin]? Accessing tft...

1.What is one benefit of PVST+? A. PVST+ supports Layer 3 load balancing without loops. B. PVST+ reduces the CPU cycles for all the switches in the network. C. PVST+ allows the root switch location to be optimized per VLAN. D. PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage. Answer: C Explanation: Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. It means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic. 2. When PVST+ in work on VLAN1 of the switch, what will affect on selection of one of switches in the VLAN as root-bridge? A. Lowest IP address B. Highest MAC address C. Lowest MAC address D. Highest IP address Answer:  C Explan...