One Lesson two Routing Protocols

RIP

When using RIP as Routing protocol the router sends it's routing table (distance vector) is send to all the other routers in the network every 30 seconds or if something changed in the routing table.

Exercise 7.1.3.6:

If something changes you will see a change in the routing table.

 

R...received this network via RIP

C...directly connected

L...Local (IP-Address from the interface)

With the comand R1#sh ip route you only see the networks that the router received via RIP.

 

 Exercise 7.2.2.4 - RIP vs. EIGRP:

To determine the best route RIP and EIGRP use different parameters.
RIP: hops
EIGRP: bandwidth, delay, load (not default, has to be configured), reliability (not default, has to be configured)

 

In this network RIP would choose the lower way, even though the bandwidth is much lower. 

EIGRP (a Routing Protocol by cisco) chooses the upper path because the bandwidth is higher. Therefor EIGRP is faster than RIP. An other good thing about EIGRP is that load-balacing is easy to adjustable.

The administrative distance from EIGRP is lower than the one from RIP.

Inter-VLAN Troubleshooting

Übung 5.2.2.4.

This network was already configured and the configuration had to be compared to the configuration table.
The errors found had to be corrected.

• Wrong VLAN-IDs:

 Some of the VLANs had the wrong IDs assigned. To correct this you could either deactivate the VLAN or change it to a different one.

• "Trunk" Interface not configured as trunk:

The interface has to be configured as a trunk with the command: switchport mode trunk

• IP configuration errors:

When the IP configuration doesn't match you had to change it according to the configuration table.

You should now be able to ping!

One Lesson three exercises concerning VLAN

VLANs:

VLANs (Virtual Local Area Network) split a network into logical parts. This makes the networkadministration much easier. The splitting of the network takes part on switches, therefor on Layer 2. With using VLANs the network is splitted into many broadcast domains. If a host in a VLAN sends a broadcast the hosts of the other VLAN can not "hear" that broadcast. This needs less bandwith than sending the broadcast out to all the hosts and boosts the performance of the network.

Exercise 3.1.1.5 Who hears the broadcast?: 

In this exercise we had to test if the hosts are connected. (They were) Afterwards we had to test a broadcast in the simulation mode. You can see how the host, that sends the broadcast, sends it's broadcast packet to the switch. The switch duplicates it and sends it to the hosts, that are in the same VLAN as the first host.

1.     If a PC in VLAN 10 sends a broadcast message, which devices receive it?

 PC8 to PC15

2.     If a PC in VLAN 20 sends a broadcast message devices receive it?

 PC16 to PC23

3.     If a PC in VLAN 30 sends a broadcast message devices receive it?

 PC0 to PC7

4.     What happens to a frame sent from a PC in VLAN 10 to a PC in VLAN 30?

 It gets lost

5.     Which ports on the switch light up if a PC connected to port 11 sends a unicast message to a PC connected to port 13?

 Port 11 and Port 13

6.     Which ports on the switch light if a PC connected to port 2 sends a unicast message to a PC connected to port 23?

 Port 2

7.     In terms of ports, what are the collision domains on the switch?

 The area where frames can collide.

8.     In terms of ports, what are the broadcast domains on the switch?

 The area where you are able to recive a broadcast - VLANs.

3.1.2.7 Investigating a VLAN Implementatiton:

 

If hosts are in the same VLAN they are able to communicate even though they are in different subnets. If hosts are in different subnets, they are not able to communicate. To see that, we had to ping hosts in the same and hosts in different networks.