Cisco 300-410 Practice Test - Questions Answers, Page 6

Restrictions for IPv6 RA Guard

The IPv6 RA Guard feature does not offer protection in environments where IPv6 traffic is tunneled.

This feature is supported only in hardware when the ternary content addressable memory (TCAM) is programmed.

This feature can be configured on a switch port interface in the ingress direction.

This feature supports host mode and router mode.

This feature is supported only in the ingress direction; it is not supported in the egress direction.

This feature is not supported on EtherChannel and EtherChannel port members.

This feature is not supported on trunk ports with merge mode.

This feature is supported on auxiliary VLANs and private VLANs (PVLANs). In the case of PVLANs, primary VLAN features are inherited and merged with port features.

Packets dropped by the IPv6 RA Guard feature can be spanned.

Reference:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/xe-16-10/ip6f-xe-16-10-book/ip6-ra-guard.html#GUID-589AF00C-7499-439F-AD23-51005D61CAB7

Reference:

Note: By default Static Router AD value-1 hence ip route 0.0.0.0. 0.0.0.0. 1.1.1.1 track 1 means AD-1 which must be less than of back up route AD.

Define the backup route to use when the tracked object is unavailable.

!--- The administrative distance of the backup route must be greater than !--- the administrative distance of the tracked route.

!--- If the primary gateway is unreachable, that route is removed

!--- and the backup route is installed in the routing table

!--- instead of the tracked route.

https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/200785-ISP-Failover-with-defaultroutes-using-I.html

https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generationfirewalls/118962-configure-asa-00.html

A label edge router (LER, also known as edge LSR) is a router that operates at the edge of an MPLS network and acts as the entry and exit points for the network. LERs push an MPLS label onto an incoming packet and pop it off an outgoing packet.

Reference:

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nxos/mpls/configuration/guide/mpls_cg/mp_mpls_overview.pdf

By using "deny" keyword in a route-map, we can filter out the prefix specified in the prefix-list.

But there is an implicit "deny all" statement in the prefix-list so we must permit other prefixes with "permit" keyword in the route-map.

When you configure an EIGRP summary route, all networks that fall within the range of your summary are suppressed and no longer advertised on the interface. Only the summary route is advertised. But if we want to advertise a network that has been suppressed along with the summary route then we can use leak-map feature. The below commands will fix the configuration in this question:

R1( config)#access-list 1 permit 10.1.1.0 0.0.0.3 R1(config)#route-map Leak-Route permit 10 // this command will also remove the "route_map Leak-Route deny 10" command.

R1(config-route-map)#match ip address 1

Reference: https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/200785-ISP-Failover-withdefault-routes-using-I.htmlIn the above configuration we have not had activated our IP SLA operation. We can start it withthis command:

R1(config)#ip sla schedule 100 life forever start-time now

Also we should specific the rate of ICMP echo:

R1(config-ip-sla-echo)#frequency 5 // Send ICMP echo every 5 seconds