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Take the Zone's CCNA-level OSPF Challenge Quiz

Last week's Zone Newsletter discussed reports that OSPF has become a heavily covered topic on the most recent Cisco CCNA exam. In this week's Zone newsletter, CCNA candidates will find a ten-question OSPF challenge that will help them determine their readiness to respond accurately to such questions.

How do you make OSPF do automatic classful summarization?

	a) Explicitly code the (non-default) router subcommand auto-summary
	b) Use network statements without the wildcard mask
	c) OSPF is not capable of automatic classful summarization.
	d) Enable automatic summarization on the area border routers.

With the configuration below, what is the OSPF router ID?

int loop 0
ip addr 172.16.1.1 255.255.255.0
int loop 1
ip addr 172.17.1.2 255.255.255.0
int eth 0
ip addr 192.168.4.10 255.255.255.0
shutdown
int eth 1
ip addr 192.168.168.245 255.255.255.0

	a) 172.16.1.1
	b) 172.17.1.2
	c) 192.168.4.10
	d) 192.168.168.245

What OSPF protocol mechanisms determine the time to detect that a directly connected router, or the link to it, has failed?
(Choose 3)

	a) Hardware type
	b) Dead timer
	c) Hello interval
	d) Retransmission delay
	e) Holddown
	f) Interface transmission delay

What OSPF timer mechanisms increase processing load on a single router?
(Choose 2)

	a) Increasing the spf hold time
	b) Reducing the spf delay time
	c) Reducing the hello interval
	d) Increasing the retransmission delay

What is the relationship of the OSPF process ID and the autonomous system number used if the domain is connected to the Internet?

	a) There is none. The process ID is local to each router.
	b) The process ID must match the AS number.
	c) When private AS numbers are used in a confederation, the process IDs either must match one of the private AS numbers or the registered AS number.
	d) The router ID should encode the AS number being used.

With the configuration below, what is the OSPF router ID?

int eth 0
ip addr 192.168.4.10    255.255.255.0
shutdown
int eth 1
ip addr 192.168.168.245 255.255.255.0
shutdown
int eth 2
ip addr 192.168.133.1   255.255.255.0
int ser 0
ip addr 172.16.1.1      255.255.255.252

	a) 172.16.1.1
	b) 192.168.4.10
	c) A router ID cannot be established.
	d) 192.168.133.1

With the configuration below, what is the OSPF router ID?

int eth 0
ip addr 192.168.4.10 255.255.255.0
shutdown
int eth 1
ip addr 192.168.168.245 255.255.255.0
shutdown
int eth 2
shutdown
ip addr 192.168.133.1   255.255.255.0
int ser 0
ip addr 172.16.1.1      255.255.255.252
shutdown

	a) 172.16.1.1
	b) 192.168.4.10
	c) A router ID cannot be established.
	d) 192.168.168.245

Which types of OSPF networks will not be displayed by show ip ospf database net?
(Choose 2)

	a) stub network
	b) OSPF point-to-multipoint
	c) point-to-point
	d) subinterface

Under what circumstances will OSPF send unicast packets on multicast media?
(Choose 2)

	a) During database synchronization
	b) When implicitly acknowledging an update on broadcast media
	c) When explicitly acknowledging an update on broadcast media
	d) When acknowledging a retransmission

10.

A router starts up with the configuration:

int eth 0
ip addr 192.168.4.10    255.255.255.0
shutdown
int eth 1
ip addr 192.168.168.245 255.255.255.0
int eth 2
ip addr 192.168.133.1   255.255.255.0
shutdown
int ser 0
ip addr 172.16.1.1      255.255.255.252
shutdown
router ospf 99
network 192.168.4.10  0.0.0.0 area 0.0.0.1
network 192.168.133.1 0.0.0.0 area 0.0.0.1
network 172.16.1.1    0.0.0.0 area 0.0.0.1

What is the OSPF router ID?

	a) 192.168.133.1
	b) 192.168.168.245
	c) 172.16.4.4
	d) 10.1.0.1

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