RSE CCNA 2 Chapter 2 Quiz Online

A summary route represents multiple networks. A summarized static route does not necessarily provide a better route than a routing protocol does. A default static route would provide a default gateway for a router that is connected to an ISP. Routing protocol updates may not necessarily be reduced in if static route routes are also used.

In a recursive static route, only the next-hop IPv6 address is specified. As a consequence, the router must perform a recursive route table lookup to find an exit interface associated with the network of the IPv6 address.

The network administrator could use the show ip interface brief command to verify that the exit interface or the interface connected to the next hop address is up and up. The ping command can be used to see if the next hop address is reachable. The show ip route command displays the routing table. The show ip protocols command is used when a routing protocol is enabled. The tracert command is used from a Windows PC.

When a static route is to be configured via the next-hop IP address, the IP address of the interface of the next router in the path to the destination is used.

An example of a floating static route used in conjunction with the EIGRP routing protocol would be as follows.
(config)# ip route 192.168.10.0 255.255.255.0 95
Notice the extra number at the end of the static route. This route only appears in the routing table if the EIGRP-learned route with an administrative distance of 90 went down. That floating static route cannot appear in the routing table when a route with a better administrative distance exists.

For a route to be considered a default static route it must use a network ID and subnetmask combination that will match any destination IP address. The address and mask of 0.0.0.0 0.0.0.0 in a static route will create a route table entry that matches any destination.

The administrative distance of 5 added to the end of the static route creates a floating static situation for a static route that goes down. Static routes have a default administrative distance of 1. This route that has an administrative distance of 5 will not be placed into the routing table unless the previously entered static route to the 192.168.10.0/24 goes down or was never entered. The administrative distance of 5 added to the end of the static route configuration creates a floating static route that will be placed in the routing table when the primary route to the same destination network goes down. By default, a static route to the 192.168.10.0/24 network has an administrative distance of 1. Therefore, the floating route with an administrative distance of 5 will not be placed into the routing table unless the previously entered static route to the 192.168.10.0/24 goes down or was never entered. Because the floating route has an administrative distance of 5, the route is preferred to an OSPF-learned route (with the administrative distance of 110) or an EIGRP-learned route (with the administrative distance of 110) to the same destination network.

A fully specified static route has the next-hop IP address and exit interface specified. A recursive static route has only the next-hop IP address specified. A directly attached static route has only the router exit interface specified. A floating static route has a higher metric than the dynamic routes and serves as a backup route.

The command ipv6 route 2001:db8:acad:1::/32 2001:db8:acad:6::2 200, specifies a floating static route to the 2001:db8:acad:1::/32 network with an administrative distance of 200. Since OSPF has an administrative distance of 110, the static route would only be placed in the routing table if the OSPF learned route was removed.

Because static routes must be created and changed manually, they require a larger investment of administrative time and do not scale easily. Static routes do not require additional CPU cycles to calculate and advertise routes, and they provide more security because they are not advertised over the network. Proper implementation of static routes requires the administrator to have a complete understanding of the network topology.

A default static route is a route that matches all packets. It identifies the gateway IP address to which the router sends all IP packets for which the router does not have a learned or static route. A default static route is simply a static route with 0.0.0.0/0 as the destination IPv4 address. Configuring a default static route creates a gateway of last resort.​

To test a floating static route, take down the main route/link in order to see whether the backup link appears in the routing table. The show ip route command simply shows the routing table. Only one of the static routes would be shown at any one time.

The correct prefix and prefix length for a default route is ::/0, which matches any address. ::/128 matches only the specific address of all zeros. When creating a static route that uses a link-local address as the next hop, an exit interface must also be specified for the route to be valid.