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 CISCO Certification Questions

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Q:

The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?

A) Application B) Host-to-Host
C) Internet D) Network Access
 
Answer & Explanation Answer: C) Internet

Explanation:

The four layers of the DoD model are Application/process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.

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Q:

At which layer is routing implemented , enabling connections and path selection between two end systems?

Answer

The Network layer provides routing through an internetwork and logical addressing.

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Subject: CCNA

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Q:

You want to run the new 802.1w on your switches. which of the following would enable this protocol?

A) Switch (config) # Spanning-tree mode rapid-pvst B) Switch#spanning-tree mode rapid-pvst
C) Switch (config)#spanning-tree mode 802.1w D) Switch#spanning-tree mode 802.1w
 
Answer & Explanation Answer: A) Switch (config) # Spanning-tree mode rapid-pvst

Explanation:

802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d

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Q:

Which layer is responsible for converting data packets from the Data Link layer into electrical signals?

Answer

The physical layer takes frames from the Data Link layer and encodes the 1s and 0s into a digital signal for transmission on the network medium.

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Q:

Which layer combines bits into bytes and bytes into frames, uses MAC addressing , and provides error detection?

Answer

The Data Link layer is responsible for the framing of data packets.

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Subject: CCNA

10 8343
Q:

What is the purpose of Spanning Tree Protocol in a switched LAN?

A) To provide a mechanism for network monitoring is switched environments B) To prevent routing loops in network with redundant paths
C) To prevent switching loops in networks with redundant switched paths D) To manage the VLAN database across multiple switches
 
Answer & Explanation Answer: C) To prevent switching loops in networks with redundant switched paths

Explanation:

The Spanning Tree Protocol (STP) was designed to stop layer 2 loops. All Cisco switches have the STP on by default.

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Q:

What protocol would you use if you were running xDSL and needed authentication?

Answer

PPPoE  or  PPPoA

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Subject: CCNA

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Q:

Which layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex?

A) Presentation B) Transport
C) Application D) Session
 
Answer & Explanation Answer: D) Session

Explanation:

The Session layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex.

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