Cisco CCNA, CCENT, CCNP, And CompTIA Questions: HSRP, OSPF Cost, Route Summarization

Let's test your knowledge of important CCNA, CCENT, CCNP, and Network+ exam topics!

CCNA Certification:

The term used for an OSPF path metric is ____________ .

Extra credit: What formula does OSPF use to calculate that metric?

Answer: OSPF's metric is referred to as cost, and the calculation is 100,000,000 / interface speed in bps.



Cisco CCENT / CompTIA Network+ Question:

Which of the following do TCP and UDP headers have in common?

A. sequence number

B. source port

C. source IP address

D. window

E. destination port

F. destination IP address

G. ACK bit

H. reset bit

Answer: B, E. In addition to the source port and destination port numbers, the UDP and TCP headers also have a checksum field in common.



CCNP Certification / BSCI Exam:

In ISIS, what is the most efficient point of a network at which to perform route summarization?

A. An L1 router.

B. An L2 router.

C. An L1/L2 router.

D. A DIS router.

Answer: C. L1/L2 routers are area boundary routers in ISIS, and this is the most efficient point at which to configure route summarization



CCNP Certification / BCMSN Exam:

Short answer: An HSRP router is the primary router and it has a priority of 100. Another router comes online in the same group and it has a priority of 107. Does the new router become the primary? If so, why? If not, what additional configuration is needed to make it the primary?

Answer. By default, the new router with the higher priority will not become the primary router. To allow a router with a higher priority to take over the role of HSRP primary from an existing and normally functioning primary, the preempt option must be configured on the router with the higher priority.

Let's use a two-router HSRP deployment as an example. R2 is the standby, R3 is the primary ("active"), and both have an HSRP priority of 100. Raising R2's priority to 150 does not automatically make it the primary, as shown below.


R2(config)#interface ethernet0

R2(config-if)#standby 5 priority 150


R2#show standby

Ethernet0 - Group 5

Local state is Standby, priority 150

Hellotime 4 sec, holdtime 12 sec Next hello sent in 0.896

Virtual IP address is 172.12.23.10 configured

Active router is 172.12.23.3, priority 100 expires in 8.072

Standby router is local 1 state changes, last state change 00:14:24


R2 now has a higher priority, but R3 is still the active router. R2 will not take over as the HSRP primary until R3 goes down - OR the preempt option is configured on R2.


R2(config-if)#standby 5 priority 150 preempt


1d11h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 state Standby -> Active


R2#show standby


Ethernet0 - Group 5

Local state is Active, priority 150, may preempt

Hellotime 4 sec, holdtime 12 sec Next hello sent in 1.844

Virtual IP address is 172.12.23.10 configured

Active router is local

Standby router is 172.12.23.3 expires in 10.204

Virtual mac address is 0000.0c07.ac05 2 state changes, last state change 00:00:13

That's enough for today! Look for more free Cisco and CompTIA certification exam questions on this website soon! A+ certification and Microsoft Vista certification practice questions are on the way as well!
by: Chris Bryant, CCIE #12933