Day 1 Questions

Question 1

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

Answer 1

All = Application
People = Presentation
Seems = Session
To = Transport
Need = Network
Data = Data Link
Protection = 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

1 = OSI (physical) -> TCP/IP (Network Interface)
2 = OSI (Data Link) -> TCP/IP (Network Interface)
3 = OSI (Network) -> TCP/IP (Internetwork)
4 = OSI (physical) -> TCP/IP (Network Interface)
5 = OSI (Session) -> TCP/IP (Application)
6 = OSI (Presentation) -> TCP/IP (Application)
7 = OSI (Application) -> TCP/IP (Application)

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

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

conf t
int f0/0
speed 10

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