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Change the Enable password, on every device, at once
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Change the authentication from local to a Radius server
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Change SNMP community strings
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Add a route process
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Add a network to a routing process
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Change the NTP server to one of the core devices
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Revise the banner messages to reflect a required wording change
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Add a NAT statement
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Define a revised QoS policy and apply it to all the Fast Ethernet interfaces
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Ensure all devices have the same TACACS server entries
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Remove old or outdated local user accounts
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Add network summarization statements to an interface
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Change the dial-backup number to reflect a new long-distance provider
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Convert a frame-relay based connection, to an MPLS-based connection
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Enforce VLAN consistency, enforce correct VTP participation
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Convert an access-based port to a trunk port
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Revise a DHCP scope to reflect a new DNS server
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Correct an errant switch that has taken the role of spanning-tree root
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Clear all routing processes, clear caches, and reset the router without having to reboot it
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Force a save of the current running configuration to both NVRAM and a TFTP server
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Change dial peering on VoIP gateways
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Turn off a rogue port
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Deny access to an IP engaged in nefarious activity
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Change the assigned VLAN of a port
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Change the IP addressing on the device (Note: connectivity must be maintained)
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Apply a new IPSec policy for IKE negotiation
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Add a static encryption key for a new site on the VPN
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Swing all Certificate-based VPN routers to a new authority, and refresh their certificates
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Create a new VLAN, and the appropriate interfaces, IP addresses and routing statements to get the new subnet operational
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Convert from EIGRP to OSPF, everywhere, all at once
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Execute Step14.B-7 of the Standard DR Exercise Procedure by applying the requisite configuration changes to the applicable devices
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Download a new IOS version from a TFTP server
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Create a new SSH key, enable SSH version 2, and disable Telnet access
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Repair/correct duplex mismatches.