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Slide Title, 2007 Cisco Systems, Inc. All rights reserved.,ICND1 v1.02-,11,Body Text,Second Level,Third Level,Fourth Level,Fifth Level,Ethernet LANs,Understanding Switch Security,Common Threats to Physical Installations,Hardware threats,Environmental threats,Electrical threats,Maintenance threats,Configuring a Switch Password,Configuring the Login Banner,Defines and enables a customized banner to be displayed before the username and password login prompts.,SwitchX# banner login Access for authorized users only. Please enter your,username and password. ,Telnet vs. SSH Access,Telnet,Most common access method,Insecure,SSH-encrypted,! The username command create the username and password for the SSH session,Username cisco password cisco,ip domain-name ,crypto key generate rsa,ip ssh version 2,line vty 0 4,login local,transport input ssh,Cisco Catalyst 2960 Series,SwitchX(config-if)#switchport port-security mac-address mac-address | mac-address sticky mac-address | maximum value | violation restrict | shutdown,SwitchX(config)#interface fa0/5,SwitchX(config-if)#switchport mode access,SwitchX(config-if)#switchport port-security,SwitchX(config-if)#switchport port-security maximum 1,SwitchX(config-if)#switchport port-security mac-address sticky,SwitchX(config-if)#switchport port-security violation shutdown,Configuring Port Security,SwitchX#show port-security,interface,interface-id, ,address, ,|,begin,|,exclude,|,include,expression,SwitchX#,show port-security interface fastethernet 0/5,PortSecurity:Enabled,PortStatus:Secure-up,ViolationMode:Shutdown,AgingTime:20mins,AgingType:Absolute,SecureStaticAddressAging:Disabled,MaximumMACAddresses:1,TotalMACAddresses:1,ConfiguredMACAddresses:0,StickyMACAddresses:0,LastSourceAddress:0000.0000.0000,SecurityViolationCount:0,Verifying Port Security on the Catalyst 2960 Series,SwitchX#sh port-security,Secure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action,(Count) (Count) (Count),-,Fa0/5 1 1 0 Shutdown,-,Total Addresses in System (excluding one mac per port) : 0,Max Addresses limit in System (excluding one mac per port) : 1024,SwitchX#sh port-security address,Secure Mac Address Table,-,Vlan Mac Address Type Ports Remaining Age,(mins),- - - - -,1 0008.dddd.eeee SecureConfigured Fa0/5 -,-,Total Addresses in System (excluding one mac per port) : 0,Max Addresses limit in System (excluding one mac per port) : 1024,Verifying Port Security on the Catalyst 2960 Series (Cont.),Securing Unused Ports,Unsecured ports can create a security hole.,A switch plugged into an unused port will be added to the network.,Secure unused ports by disabling interfaces (ports).,Disabling an Interface (Port),shutdown,SwitchX(config-int)#,To disable an interface, use the,shutdown,command in interface configuration mode.,To restart a disabled interface, use the,no,form of this command.,Summary,The first level of security is physical.,Passwords can be used to limit access to users that have been given the password.,The login banner can be used to display a message before the user is prompted for a username.,Telnet sends session traffic in cleartext; SSH encrypts the session traffic.,Port security can be used to limit MAC addresses to a port.,Unused ports should be shut down.,
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