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Cisco CCNA, CCNP, And Security Practice Exam: OSPF Neighbors, Fail Closed, SDM, And More!

By: Chris Bryant

Networking Here’s a free Cisco certification practice exam for you! Answers are at the bottom of the article. No peeking!

CCNA Certification:

In an OSPF hub-and-spoke NBMA network, which router(s) require the neighbor command?

A. The DR

B. The DROthers

C. The BDR

D. All of these

E. None of these

CCNA Security Certification / CCNP ISCW Exam:

You're configuring IPS in SDM, and you just enabled the Fail Closed option. What's the net effect?

CCNP Certification / BSCI Exam:

Which of the following are Cisco recommendations for OSPF deployments?

A. No router in more than three areas.

B. No area should contain more than 50 routers.

C. No router should have more than 60 neighbors.

D. No ABR should run more than one OSPF process.

CCNP Certification / BCMSN Exam:

You're examining the lights on a Cisco Aironet card. The green light is blinking slowly, the amber light is off. What does this generally indicate?

CCNP / ONT Exam:

What is Global Synchronization? Is it a benefit or a detriment to network performance?

Here are the answers!

CCNA: Answer: A. The DR requires the neighbor command. It will not hurt anything to have it configured on the DROthers in real-world networks, but I wouldn't put it there on exam day. There are no BDRs in an OSPF hub-and-spoke network.

ISCW / CCNA Security: Answer: Here's the exact description of Fail Closed from SDM itself:

"By default, while IOS compiles a new signature for a particular engine, it allows packets to pass through without scanning for the corresponding engine. Enable this option to make IOS drop packets during the compilation process."

Fail Closed is disabled by default.

BSCI: Answer: A, B, C, D. Those are all Cisco best practices for OSPF.

BCMSN: Answer: Here's a quick review of what those lights are and what the different combinations indicate.

We have two lights on a Cisco Aironet card. The green light is the Status LED, and the amber light is the Activity LED. We've got quite a few combinations with those two lights, so let's take a look at what each of the following LED readouts indicates.

Status off, Activity off - Naturally, this means the card isn't getting power!

Status blinking slowly, Activity off - the adapter's in Power Save mode.

Status on, Activity off - adapter has come out of Power Save mode.

Both lights blinking in an alternating fashion - adapter is scanning for its network.

Both lights blinking slowly at the same time - adapter has successfully associated with an AP (or other client if you have an Ad Hoc network)

Both lights blinking quickly at the same time - adapter is associated and is sending or receiving data

ONT: Answer: Here's a review of tail drop and how it can cause Global Synchronization. Usually synchronization is good, but this kind isn't!

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