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Cisco 300-101 Exam

Implementing Cisco IP Routing (ROUTE v2.0)

Question: 1
Refer to the exhibit. EIGRP has been configured on all routers in the network. What additional
configuration statement should be included on router R4 to advertise a default route to its
neighbors?

A. R4(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1
B. R4(config)# ip default-network 10.0.0.0
C. R4(config-router)# default-information originate
D. R4(config)# ip route 10.0.0.0 255.0.0.0 10.1.1.1

Answer: B
Explanation:
Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled
on the Cisco router. When you configure ip default-network the router considers routes to that
network for installation as the gateway of last resort on the router.
For every network configured with ip default-network, if a router has a route to that network, that
route is flagged as a candidate default route.
Gateways of last resort selected using the ip default-network command are propagated differently
depending on which routing protocol is propagating the default route. For IGRP and EIGRP to
propagate the route, the network specified by the ip default-network command must be known to
IGRP or EIGRP. This means the network must be an IGRP- or EIGRP-derived network in the routing
table, or the static route used to generate the route to the network must be redistributed into IGRP
or EIGRP, or advertised into these protocols using the network command. In this case, the 10.0.0.0
network is indeed being advertised via EIGRP.
Reference:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#ipnet
work

Question: 1

Refer to the exhibit. Router RTA is the hub router for routers RTB and RTC. The Frame Relay network
is configured with EIGRP, and the entire network is in autonomous system 1. However, router RTB
and RTC are not receiving each other's routes. What is the solution?

A. Check and change the access lists on router RTA.
B. Configure the auto summary command under router eigrp 1 on router RTA.
C. Configure subinterfaces on the spoke routers and assign different IP address subnets for each
subinterface.
D. Issue the no ip split horizon command on router RTA.
E. Issue the no ip split horizon eigrp 1 command on router RTA.
F. Configure a distribute list on router RTA that allows it to advertise all routes to the spoke routers.

Answer: E
Explanation:
Split horizon controls the sending of EIGRP update and query packets. When split horizon is enabled
on an interface, these packets are not sent for destinations for which this interface is the next hop.
This reduces the possibility of routing loops.
By default, split horizon is enabled on all interfaces.
Split horizon blocks route information from being advertised by a router out of any interface from
which that information originated. This behavior usually optimizes communications among multiple
routing devices, particularly when links are broken. However, with nonbroadcast networks (such as
Frame Relay and SMDS), situations can arise for which this behavior is less than ideal. For these
situations, you may want to disable split horizon. In this example, routes received by RTB and RTC
are not being sent back out the same serial interface on RTA, so they are not receiving each other’s
routes. Disabling Split horizons on interface S0/0 on RTA will fix this issue.

Question: 2
Refer to the exhibit. EIGRP is configured on all routers in the network. On a basis of the show ip eigrp
topology output provided, what conclusion can be derived?

A. Router R1 is waiting for a reply from the neighbor 10.1.2.1 to the hello message sent out inquiring
for a second successor to network 10.6.1.0/24.
B. Router R1 can send traffic destined for network 10.6.1.0/24 out of interface FastEthernet0/0.
C. Router R1 is waiting for a reply from the neighbor 10.1.2.1 to the hello message sent out before it
declares the neighbor unreachable.
D. Router R1 is waiting for a reply from the neighbor 10.1.2.1 in response to the query sent out
about network 10.6.1.0/24.

Answer: D
Explanation:
The “show ip eigrp topology” command lists all routes that EIGRP is aware of and shows whether
EIGRP is actively processing information on that route. Under most normal conditions, the routes
should all be in a passive state and no EIGRP process are running for that route. If the routes are
active, this could indicate the dreaded stuck in active, or SIA, state.
The fields to note in this output are as follows:

P— Passive; no EIGRP computation is being performed. This is the ideal state.

A— Active; EIGRP computations are "actively" being performed for this destination. Routes
constantly appearing in an active state indicate a neighbor or query problem. Both are symptoms of
the SIA problem.

U— Update; an update packet was sent to this destination.

Q— Query; a query packet was sent to this destination.

R— Reply; a reply packet was sent to this destination.

Route information— IP address of the route or network, its subnet mask, and the successor,
or next hop to that network, or the feasible successor.

Question: 3
Refer to the exhibit. Which three statements are true? (Choose three.)

A. On the routing table of R4, the 10.1.1.0/24 route appears as an O E2 route.
B. On R4, the 172.16.1.0/24 route has a metric of 20.
C. The R3 S0/0 interface should not need the no ip split-horizon eigrp 1 configuration command for
the 172.16.1.0/24 route to appear in the routing table of R2 as an D EX route.
D. The administrative distance of the 172.16.1.0/24 route in the routing table of R3 is 170.
E. On R5, the 4.0.0.0/8 route will have an administrative distance of 120 and a hop count of 6.

Answer: A, B, D
Question: 4
Which command will display EIGRP packets sent and received, as well as statistics on hello packets,
updates, queries, replies, and acknowledgments?
A. debug eigrp packets
B. show ip eigrp traffic
C. debug ip eigrp
D. show ip eigrp interfaces

Answer: B
Explanation:
The show ip eigrp traffic command displays the number of Enhanced IGRP (EIGRP) packets sent and
received.
Example:
The following is sample output from the show ip eigrp traffic command:
Router# show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 77
Hellos sent/received: 218/205
Updates sent/received: 7/23
Queries sent/received: 2/0

Replies sent/received: 0/2
Acks sent/received: 21/14
Reference:http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_refere
nce_chapter09186a00800ca5a9.html#wp1018815

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