In a lab, R1 connects to R2, which connects to R3. R1 and R2 each have several working
interfaces, all assigned addresses in class A network 10.0.0.0. Router R3 has some working
interfaces in class A network 10.0.0.0, and others in class B network 172.16.0.0. The
engineer experiments with the auto-summary command on R2 and R3, enabling and
disabling the command in various combinations. Which of the following combinations will
result in R1 seeing a route for 172.16.0.0/16, instead of the individual subnets of class B
network 172.16.0.0?

Router R1 exists in an Enterprise that uses EIGRP as its routing protocol. The show ip route
command output on router R1 lists the following phrase: “Gateway of last resort is 1.1.1.1 to
network 2.0.0.0”. Which of the following is most likely to have caused this output to occur on
R1?

Enterprise Router R1 connects an Enterprise to the Internet. R1 needs to create and
advertise a default route into the Enterprise using EIGRP. The engineer creating the
implementation plan has chosen to base this default route on the ip route command, rather

than using ip default-network. Which of the following is not a useful step with this style of
default route configuration?

A router has been configured with the commands router ospf 9, network 172.16.1.0
0.0.0.255 area 8, and network 172.16.0.0 0.0.255.255 area 9, in that order. No other OSPFrelated commands have been configured. The answers list the IP addresses that could be
assigned to this router’s Fa0/0 interface. Which answers list an IP address/prefix length that
would cause the router to put Fa0/0 into area 9? (Choose two.)

Which of the following is true about an OSPF area border router (ABR)?

Which of the following can either directly or indirectly identify all the interfaces for which both
1) OSPF has been enabled and 2) OSPF is not passive? (Choose two.)

Router R1 directly connects to subnet 10.1.1.0/24 with its Fa0/0 interface. R1 can ping four
other working OSPF routers in that subnet. R1 is neither the designated router (DR) nor
backup DR (BDR). OSPF is working correctly on all five routers. Which of the following is
true on R1? (Choose two.)

Routers R1 and R2 are OSPF neighbors using their Fa0/0 interfaces, respectively, using
default settings for all timers. An engineer adds the ip ospf hello-interval 6 command to R1’s
Fa0/0 configuration. Which of the following is true regarding the results from this change?
(Choose 2)

Routers R1 and R2, OSPF neighbors in area 0 over their Fa0/0 interfaces (respectively),
currently both successfully use OSPF MD5 authentication. The OSPF configuration includes
the area 0 authentication command under the router ospf 1 command. Which of the following
commands must have been configured on R1’s Fa0/0 interface? (Choose two.)

Which of the following settings do not prevent two potential OSPF neighbors from becoming
neighbors?