Administrative distance refers to the trustworthiness of a particular route.
A router first installs routes with higher administrative distances.
The value of the administrative distance can not be altered by the network administrator.
Routes with the smallest metric to a destination indicate the best path.
The metric is always determined based on hop count.
The metric varies depending which Layer 3 protocol is being routed, such as IP or IPX.
R1 will install a RIP route using network A in its routing table because the administrative distance of RIP is higher than EIGRP.
R1 will install a RIP route using network A in its routing table because the path cost from RIP is lower than EIGRP.
R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is lower than RIP.
R1 will install an EIGRP route using network B in its routing table because the path cost from EIGRP is lower than RIP.
R1 will install an EIGRP route and a RIP route in its routing table and load balance between them.
Sends subnet mask information in routing updates
Sends complete routing table update to all neighbors
Allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology
Reduces the amount of address space available in an organization
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RIP uses hop count and bandwidth as the metric for path selection and sendsupdates periodically.
OSPF is a Cisco proprietary protocol that sends updates triggered by topology changes.
EIGRP uses DUAL to calculate the shortest path and can be configured to do unequal cost load balancing.
BGP is a path vector interior routing protocol.
The network requires a special hierarchical design
Fast convergence of the network is crucial
The network is using a hub and spoke topology
The network is using a flat design
There are more than 15 hops between the most distant routers
It is used to build and maintain ARP tables.
It provides a method for segmenting and reassembling data packets.
It allows an administrator to devise an addressing scheme for the network.
It allows a router to share information about known networks with other routers.
It provides a procedure for encoding and decoding data into bits for packet forwarding.
They use hop count as their only metric.
They only send out updates when a new network is added.
They send their routing tables to directly connected neighbors.
They flood the entire network with routing updates.
Low processor overhead
Shortest-path first calculations
Routers will not allow packets to be forwarded until the network has converged.
Hosts are unable to access their gateway until the network has converged.
Routers may make incorrect forwarding decisions until the network has converged.
Routers will not allow configuration changes to be made until the network has converged.
The routers in the network are operating with dynamic routing protocols.
The routers in the network are operating with compatible versions of IOS.
The routers in the network are operating with the same routing tables.
The routers in the network are operating with consistent routing knowledge.
RIP uses bandwidth as a metric.
OSPF uses delay as a metric.
EIGRP uses bandwidth as a metric.
OSPF uses cost based on bandwidth as a metric.
RIP uses delay as a metric.
EIGRP uses hop count only as a metric.
Reduced effort in configuring routes
The administrator maintains control over routing
Easier to implement in a growing network
Reduces the chance of routing errors
Increased router resource usage
A packet destined for host 192.168.252.2 will be forwarded out the interface connected to network 184.108.40.206/24.
The value, 120, is used to determine the best path when a router has more than one routing protocol configured for the same destination network.
This route was manually configured using the ip route command.
192.168.252.2 is an interface on the router that produced this output.
The 172.16.3.0 network will be routed by any dynamic routing protocol automatically.
A routing table entry is made to the 172.16.3.0 network with a code of “C”.
A static route is required to route traffic to the 172.16.3.0 network.
The commands will be saved to the startup-configuration.
The administrative distance of this route is 1.
192.168.1.2 is the address of an interface on this router.
This route will display as a directly connected network in the routing table.
Packets with a destination IP address of 192.168.1.2 will be forwarded to the 10.0.0.0/24 network first.
Router1 will have 6 directly connected networks.
The administrative distance of the route to network 172.16.0.0 will be 90.
The metric for routes to 172.16.0.0 will be 1.
The interface that is used to forward packets to 172.16.0.0 will always be the S0/1 interface.
The cost for this link has a value of 129.
The clock rate on this serial interface is set to 129,000.
The next-hop router is 129 hops away from this router.
This route has been updated 129 times in this routing table.
Distance vector routing protocols, such as RIP, converge more quickly than do link-state routing protocols.
EIGRP can be used on all of the routers in the company.
OSPF can be used between the routers.
An exterior routing protocol, such as BGP, is recommended for growing companies.
The router will install the first route it learned into the routing table.
The router will install both routes in the routing table and load balance between the two.
The router will put the first route in the routing table, and denote the second route as a backup route.
The router will pick the path with the higher bandwidth and will place it in the routing table.
Lowest hop count
Greatest available bandwidth
Lowest administrative distance