Third Exercise with Packet Tracer

In this lesson we had to do two exercises. In 6.4.1.3 there is a computer connected to a router and we had to configure the router. In 6.4.3.3 there is a network of some computers, two switches and a router but some of the computers are not connected to the network. We had to figure out why.
 

Exercise 6.4.1.3

• To configure the router the terminal is needed. To see the running configuration we use the router# show running-config command. Now we are able to answer the questions in Step 2 c.
• What is the router’s hostname? Router
• How many Fast Ethernet interfaces does the Router have? 4
• How many Gigabit Ethernet interfaces does the Router have? 2 
• How many Serial interfaces does the router have? 2
• What is the range of values shown for the vty lines? 0 to 4

•  If you type in sh startup-config the router will tell you, that it is not present because the startup-config is not yet configured.
• In Part 2 we had to define new passwords.

• Router(config)#hostname R1:
  
  
  Changes the name of the router. (Can also be done in the configuration dialog)
  
  R1(config)#line con 0:
  This command changes the config line.
  
  R1(config-line)#password letmein:
  To declare the password and set it to "letmein". Afterwards you login and exit so that the password is set.
  
  

  R1(config)#password enable cisco
  This is to declare the password to enter the privileged mode. It is not encryped.
  
  R1(config)#password secret itsasecret
  For a encryped password for the privileged mode you need this command.
  
  R1(config)#banner motd #Unauthorized acces is strictly prohibited. #
  You can set the Message of the day by using this command. It will be shown if you want to log in as seen in the picture below.
  

  

  
  
  
• The startup-config is saved in the NVRAM  with the command R1(config)# copy r s 

 

Exercise 6.4.3.4

• Task 1: Fill the table shown below
  
  
  
   
• Task 2: Testing connections and finding solutions for not-connected devices.
  

IPv4 Addresses

In this lesson we had to improve our knowledge about IPv4 addresses and their subnets. To improve our our knowledge we had to do the exercise from Chapter 7.1.4.9

The exercise has 2 Parts.

• Identify IPv4 Addresses

• Classify IPv4 Addresses

Why should we continue to study and learn about IPv4 addressing if the available IPv4 address space is
depleted?
We still learn iPv4 addressing because many small or older networks still work on iPv4 and because many devices still aren't compatible with iPv6.

Second Exercise with Packet Tracer

Setting up and connecting two Newtworks

This week we first had to set up two networks and connect them to each other. First we had to configure the IP-addresses of the diveces.
To connect the two networks we use a serial port. To do that, we had to put the HWIC-2T-Module in the router.

After the setup we had to save the configurations of the router. This can be done by using copy r s (copy running-config startup-config) or show running-config and copy this into an editor file and store it on your computer. If the router breaks you still have the setup and can use them again by pasting it onto the new router with ena, conf t, paste. We have to do this for both of the routers.

To set the configurations of the serial (DCE) connection we need to start with using the CLI of the router of the bigger network. ip route [ip address of the smaller network] [subnet mask] [serial port (e.g. s0/0/0)] needs to be typed in the CLI. Then we switch to the CLI of the router of the smaller network and set the default route by typing ip route 0.0.0.0 0.0.0.0 s0/0/0. 
The default route is used to connect the netowork to the network with the most unknown networks. The default route is used to connect the network to the internet.