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A. 24B. 32C. 90D. 170E. 27316
Ans: D
Explanation: By default an external EIGRP route has a value of 170. By examining the exhibit
we see that this default value of the external EIGRP routes (see D-EX in exhibit) indeed is set to
170.
Reference: What Is Administrative Distance?
http://www.cisco.com/warp/public/105/admin_distance.html
Q7
CK1 # showrun
interface Loopback0
ip address 10.10.10.1 255.255.255.0
!
interface Ethernet0
ip address 172.29.1.1 255.255.255.0
media-type 10BaseT
!
!
router eigrp 100
redistribute connected
network 172.29.0.0
no eigrp log-neighgbor-changes
!
ip classless
no ip http server
CK2 # showrun
interface Ethernet0
ip address 172.29.1.2 255.255.255.0
media-type 10BaseT
!
interface Ethernet1
ip address 172.19.2.2 255.255.255.0
media-type 10BaseT
!
router eigrp 100
network 172.19.0.0
network 172.29.0.0
!
ip classless
no ip http server
CK3 # showrun
interface Ethernet1/0
ip address 172.19.2.3 255.255.255.0
!
router eigrp 100
network 172.19.0.0
auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip http server
With the topology found in the graphic, what will the CK1 loopback 0 be in the CK3
routing table?A. It will show up in the routing table as D 10.0.0/8.B. It will show up in the routing table as D EX 10.0.0.0/8.C. It will show up in the routing table as D 10.0.0./24.D. It will show up in CK3 routing table because there is no network command on CK1 .
Ans: D
Section 8: Describe the features and operation of single area OSPF
(13 questions)
Q 1
A router running OSPF can be in seven different states. Which state must it be in to route
traffic?A. full stateB. active stateC. two-way stateD. forwarding state
Ans: A
Explanation: Full is the normal state for an OSPF router. In this state, routers are fully adjacent
with each other and the router is routing traffic.
Note: An OSPF router can be in one of the following states: down, attempt, init, 2-way, exstart,
exchange, loading, or full.
Reference: OSPF Neighbor States
http://www.cisco.com/warp/public/104/13.html
RFC2328, OSPF Version 2
Incorrect Anss
B: An IGRP or EIGRP router can be in an active state, but an OSPF cannot be in an active state.
C: At the two-way state, a router decides whether to become adjacent with this neighbor.
However, routes are not exchanged between the routers.
D: An interface (link) can be in a forwarding state, but not a router.
Q2
What does an OSPF network do to maintain route consistency when it notices a change in
the network?A. It enters the exstart state with its neighbors.B. It floods the area with new routing information.C. It generates a routing exchange using the hello protocol.D. It waits for the holddown timers to expire, then sends the update.
Ans: B
Explanation: Link state routing protocols generate routing updates only when there is a change in the
topology. When a link changes state, a link-state advertisement (LSA) concerning that link (route) is
created by the device that detected the change and propagated to all neighboring devices using a special
multicast address. This process is called flooding.
Incorrect Anss
A: The exstart state is not entered when a change in the topology occurs.
Note: Once the DR and BDR have been elected, the routers are considered to be in the exstart state
and are ready to discover the link-state information about the internetwork and create their link-state
databases.
C: The hello protocol is not used to exchange routing information. The purpose of hellos is for
identifying neighbors and verifying periodically that the neighbors exist.
D: OSPF does not use holddown timers like RIP. Topology changes are flooded immediately.
Q3
Some kinds of OSPF networks democratically elect a Designated Router (DR). In which
two network types can you find this kind of politics? (Select two)A. Point-to-pointB. Nonbroadcast multi-accessC. Point-to-multipointD. Broadcast multi-access
Ans: B, D
Explanation:
Mode Adjency
NBMA Manual Configuration DR/BDR elected
Broadcast Automatic DR/BDR elected
Reference: Building Scalable Cisco Networks (Ciscopress) page 124
Q4
Exhibit:
Examine the s0 interface on router CertKing 1. What is the OSPF network type by default?A. NonbroadcastB. BroadcastC. Point-to-multipointD. Point-to-pointE. Point-to-multipoint nonbroadcast
Ans: E
Explanation:
There are three different scenarios for NBMA interfaces.
o Pure Multipoint Configuration (No Subinterfaces)
o Pure Point-to-Point Configuration (each VC on a separate subinterface)
o Hybrid Configuration (point-to-point and multipoint subinterfaces)
Reference:
http://www.cisco.com/en/US/tech/ CK3 65/ CK2 07/technologies_tech_note09186a0080094063.shtml
#hybrid
Q5
If there is no loopback address in your OSPF configuration, what becomes the router ID?
You have an OSPF configuration and failed to include a loopback address. By default what
determines the router ID?A. It defaults to 255.B. The name set by the hostname command.C. The highest IP address configured in the router.D. The priority number of the router set by the priority command.
Ans: C
Explanation:
The show ip ospf interface command verifies that interfaces have been configured in the
intended areas. If no loopback address is specified, the interface with the highest address is the
taken router ID. It also gives the timer intervals, including the hello interval, and shows the
neighbour adjacencies.
Reference: Building Scalable Cisco Networks (Ciscopress) page 134
Q6
Which three of the statements below is true regarding the OSPF link database? (Select
three)A. Each router has an identical link state database.B. External routes are imported into a separate link state database.C. Synchronization of link state databases is maintained via flooding of LSAs.D. Information in the link state database is used to build a routing table by calculating a
shortest-path tree.E. Link state databases are refreshed every 10 minutes in the absence of topology changes.
Ans: A, C, D
Reference: Building Scalable Cisco Networks (Ciscopress) page 178
Q7
It's never in an administrator's best interests to place too many routers in a single OSPF
router. Which two of the following statements describe the consequences of having too
many routers in an area? (Select two)A. Excessive LSA traffic.B. Frequent routing table recalculation.C. Frequent adjacencies table recalculation.D. Unacceptable number of reachability errors.
Ans: A, B
Explanation:
In OSPF, if too many routers are in the same area they spend too much time communicating with
each other, because anytime anything happens to a single route, it becomes the other routers
business to know. In OSPF the amount of overhead used increases exponentially with the
number of routers in an area, so past a certain point LSA traffic and route table recalculation
literally overwhelm the router.
C is incorrect because a single area won't have adjacency tables to recalculate, and D is incorrect
because a correctly configured router shouldn't have reachability errors at all.
Q8
What is the cost that OSPF attributes to a 100Mbps Ethernet connection?A. 1B. 6C. 10D. 100
Ans: A
Explanation:
The cost (also called metric) of an interface in OSPF is an indication of the overhead required to
send packets across a certain interface. The cost of an interface is inversely proportional to the
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