Cisco CCNA Practice tests: 22 Questions and Answers

CCNA 200-301 Exam Q & A Practice tests

OSI/TCP Model Question & Answers

Question 1. Name each layer of the OSI model, from Layer 7 down to Layer 1.

Answer 1: Application, Presentation, Session, Transport, Network, Data Link, and Physical.

Question 2 The role of the Session Layer is to _______, _______, and _______ sessions or dialogues between devices.

Answer 2 - Set up, manage, and terminate.

Question 3 What are the three methods used to control data flow at Layer 4?

Answer 3 - Flow control, windowing, and acknowledgements.

Question 4 The Transport Layer includes several protocols, and the most widely known are _______ and _______.

Answer 4 - TCP and UDP 

Question 5 Why is UDP used at all if TCP/IP offers guaranteed delivery?

Answer 5 - TCP uses a lot of bandwidth on the network and there is a lot of traffic sent back and forth to set up the connection, even before the data is sent. This all takes up valuable time and network resources. UDP packets are a lot smaller than TCP packets and they are very useful if a really reliable connection is not that necessary. Protocols that use UDP include DNS and TFTP.

Question 6 What is data referred to at each OSI layer?

Answer 6 - Bits (Layer 1), Frames (Layer 2), Packets (Layer 3), Segments (Layer 4) and Data (Layers 5-7).

Question 7 In order to interface with the upper and lower levels, the Data Link Layer is further subdivided into which two Sublayers?

Answer 7 - LLC and MAC.

Question 8. What are the five TCP/IP layers from the top down?

Answer 8 - Application, Transport, Network, Data Link, and Network.

Question 9 How does the TCP/IP model map to the OSI model?

Answer 9 -

Question 10 Layer 2 addresses are also referred to as _______ addresses.

Answer 10 - MAC.

Question 11 Using a switch will allow you to divide your network into smaller, more manageable sections known as _______ _______. 

Answer 11 - Collision domains.

Cable Questions

Question 12 The current standard Ethernet cable still uses eight wires twisted into pairs to prevent _______, _______ and _______.

Answer 12 - Electromagnetic interference (EMI) and crosstalk

Question 13  _______ is when a signal from one Ethernet wire spills over into a neighbouring cable.

Answer 13 - Crosstalk.

Question 14 Which command would set the FastEthernet router interface speed to 10Mbps?

Answer 14 - The speed 10 command

Question 15 On a crossover cable, the wire on pin 1 on one end needs to connect to pin _______ on the other end and pin 2 needs to connect to pin _______.

Answer 15 - 3 and 6. 

Question 16 Which cable would you use to connect a router Ethernet interface to a PC?

Answer 16 - A crossover cable 

Question 17 You can see a summary of which interfaces you have on your router with the show _______ _______ _______ command.

Answer 17 - ip interface brief

Question 18 Line Configuration mode lets you configure which ports?

answer 18 - The console, Telnet, and auxiliary ports. 

Question 19 A Loopback interface is a _______ or _______ interface that you configure.

Answer 19 - Virtual or logical. 

 

Question 20 The keyboard shortcut Ctrl+A does what?

Answer 20 - Moves the cursor to the beginning of the command line.

Question 21 The _______ keyboard shortcut moves the cursor back one word.

Answer 21 - Esc+B. 

Question 22  By default, the _______ _______ command shows the last 10 commands entered.

Answer 22 - show history

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