Question

Which commands can be used to configure a router to run EIGRP and advertise network 192.168.16.0/24? (choose two) Router(config)#router eigrp Router(config-router)#network 192.168.16.0 0.0.0.255 area 0 Router(config-router)#network 192.168.0.0 0.0.240.255 area 0 Router(config-router)#network 192.168.16.0 255.255.255.0 Router(config)#router eigrp area 0 Router(config)#router eigrp 1 Which two are features of EIGRP routing protocol? (Choose two) EIGRP is a classful routing protocol Can summarize routes at any points in the network Converge quickly Before finding out neighbors, EIGRP routers exchange routing information Identify the best route by use of cumulative cost

Answer 1

1) The correct options are:

OPTION B - Router(config-router)#network 192.168.16.0.0.0.0.255 area 0

OPTION D - Router(config-router)#network 192.168.16.0.255.255.255.0

Explanation: We can configure a router to run EIGRP and advertise the IP 192.168.16.0/24 by two ways:

• The first way of configuring is with using the wildcard mask along with the network ID in the Router(config-router)#network command. In this way, we provide a wildcard that allows us to match exact networks (using subnet masks). Since, the IP address 192.168.16.0/24 has a subnet mask of /24, we can hence use a wildcard mask of 0.0.0.255 along with the IP address to match the subnet mask of /24. Hence, the command Router(config-router)#network 192.168.16.0.0.0.0.255 area 0 will configure the router to match /24 bits of address instead of default /16 bits. Note that area 0 is a default keyword in this command.
• The second way is to use a subnet mask(255.255.255.0) along with the IP address instead of the wildcard mask. This is also valid and will do the same job by matching /24 bits of address. Hence the command Router(config-router)#network 192.168.16.0.255.255.255.0 is also the valid command to configure the router.

Hence, all other options are invalid except the above two stated commands.

2) The correct options are:

OPTION C - Converge Quickly and

OPTION D - Before finding out neighbors, EIGRP routers exchange routing information

Explanation: The EIGRP protocol uses an algorithm called the DUAL algorithm which supports fast convergence. In simple words, it means that if a particular route to a network goes is not available, then some another route(that is a feasible successor) can be used at that very moment only. Otherwise, if there is no particular route available for that network, then a message is multicasted to find out an alternative route for that network. Hence, it converges quickly.

Also, the EIGRP routers that use EIGRP routing protocol exchange information with another router within the same autonomous system. Hence, option D is also correct and is a feature of EIGRP routing protocol.

Other options are incorrect because EIGRP routing protocol is a modern/latest routing protocol and is classless. Also, it uses nearest neighbor technique to find the best network route and does not use cumulative cost. It summarizes routes only at the start and the end points and not any points in the network. Hence, all these other options are incorrect.

Thanks!