Tuesday, October 23, 2007

Welcome! Here are the answers to your free Cisco CCENT, CCNA and CCNP exam practice questions for Monday, October 22!

CCENT And Network+ Certification Exam Question:

Briefly describe the difference between same-layer interaction and adjacent-layer interaction as these terms relate to the OSI networking model.

Answer: The term same-layer interaction describes the process of a given OSI layer removing the header placed on the data by the same layer on the sending side. For example, the Application layer on the receiving end will remove only the header placed onto the data by the Application layer on the sending side, and so forth.

The term adjacent-layer interaction refers to the interaction between layers of the OSI model on the same host. That is, the Application layer interacts with the Presentation layer, the Presentation layer interacts with both the Application layer (the one above it) and the Session layer (the one below it), and so forth.

That wasn't too brief, but you get the point. :)

CCNA Certification Exam:

Two OSPF routers connected via an Ethernet segment are exchanging Hello packets. How often will these packets be sent?

A. Every 5 seconds.

B. Every 10 seconds.

C. Every 30 seconds.

D. Every 120 seconds.

E. OSPF speakers do not send Hellos on an Ethernet segment.

Answer: B. On a broadcast network such as an Ethernet segment, OSPF speakers send hellos every 10 seconds, as shown below.

R2#show ip ospf interface ethernet0
Ethernet0 is up, line protocol is up
Internet Address, Area 23
Process ID 1, Router ID, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID), Interface address Backup Designated router (ID), Interface address
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

CCNP Certification / BSCI Exam:

A non-Cisco router will consider what value first during the BGP best path selection process?

A. weight



D. origin



Answer: C. Weight is considered first, but weight is Cisco-proprietary. A non-Cisco router will not understand the weight attribute, so local preference (LOCAL_PREF) is then used.

CCNP Certification / BCMSN Exam:

Short answer: Identify and briefly describe the port security modes.

Answer: Protect drops data with non-secure MAC addresses; Restrict does the same while generating a syslog message; Shutdown places the port into error-disabled mode.

CCNP Certification / ISCW Exam:

Identify the true statements regarding IPSec Transport mode.

A. Uses the original IP header

B. Replaces the original IP header with a transport header

C. The IP header is encrypted

D. The IP header is not encrypted

Answers: A, D. Transport mode uses the original IP header, and the IP header is not encrypted.

CCNP Certification / ONT Exam:

What term refers to traffic being dropped because the queue is full?

Answer: That's tail drop, which can lead to all sorts of problems, which we'll talk about in future blog postings!

Fresh-baked questions posted later today!

To your success,

Chris Bryant
CCIE #12933

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