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spanning tree Protocol (stP) The Spanning Tree Protocol (STP) runs at layer 2 and is designed to prevent loops on a network that could occur if you connect a number of switches together For example, a loop is created if you connect Switch1 to Switch2 and then turn around and connect Switch2 back to Switch1 using a different cable and ports on the switches Having a loop on the network could cause the network to go down and creates instability in the switches To prevent this, STP was designed STP is a protocol that looks at all of the ports used to create a loop and then places one of those ports in a blocking state so that no data traffic can pass through the port Once the port is in a blocking state, the loop is broken and the network becomes more stable The fact that the port is in a blocking state instead of being disabled means that if one of the other links go down, then the port is transitioned into a forwarding state automatically When a port is in a forwarding state, it is allowed to send and receive data on the port trunking Trunking is a feature on Cisco switches that allows you to connect the switches together and then assign one of the ports as a trunk port The trunk port is the port that is used to carry VLAN traffic to the other switch VLANs are allowed to contain ports as members that are from multiple switches If data is destined for all systems in the VLAN, the VLAN identification information is added to the data packet and then the switch sends the packet out the trunk port When another switch receives the packet, it checks the VLAN identification information and then sends the data to all of its ports that are a member of that particular VLAN isL and 8021Q When a switch assigns the VLAN identification information to a packet, this is known as tagging Two popular protocols for tagging are the InterSwitch Link (ISL) and the IEEE 8021Q protocol ISL is the Cisco proprietary protocol for tagging packets and associating them with a particular VLAN on older switches, while 8021Q is the IEEE standard for VLAN trunking Newer Cisco and Juniper Networks switches use 8021Q as the tagging method.

3:

The first time you take your router out of the box and power it on, or after you add one or more hardware components, you must use the setup command This command is automatically invoked for either of the previously defined situations, or you can use the command later at the router's command interpreter prompt level (referred to as the EXEC) Prior to running setup or issuing EXEC commands, however, you should note the cabling needed to connect a terminal device to the router's system console port

With no encapsulation, the Cisco HDLC default is used Taking out the encapsulation ppp entry from the Serial 0 port of router 3 resolves problem 1

In a star topology, all computers are connected through one central device known as a hub or a switch, as illustrated in Figure 1-6 Each workstation has a cable that goes from the network card to the hub device One of the major benefits of a star topology is that a break in the cable causes only the workstation that is connected to the cable to go down, not the entire network, as with a bus topology Star topologies are very popular topologies in today s networking environments

One advantage of a star topology is scalability and ease of adding another system to the network If you need to add another workstation to the network with a star topology, you simply connect that system to an unused port on the hub Another benefit is the fact that if there is a break in the cable it affects only the system that is connected to that cable Figure 1-7 shows a hub with a few ports available Centralizing network components can make an administrator s life much easier in the long With a star topology, run Centralized management and monitoring of if there is a break in the cable, only network traffic can be vital to network success the system connected to that cable is With a star configuration, it is also easy to add affected or change configurations because all of the connections come to a central point

figure 1-6

The system console port on a router is configured as a Data Terminal Equipment (DTE) port Because the RS-232 port on PCs and ASCII terminal devices are also configured as DTEs, you cannot directly cable the two together using a common, straight-through cable Both the router's port and the terminal device transmit on pin 2 of the interface and receive data on pin 3 To correctly work with each other, you must obtain a "crossover cable" in which pin 2 at one end is crossed to pin 3 and the other end, and vice versa The crossover table also ties certain control signals together, so it is actually a bit more than the reversal of pins 2 and 3 The cable is easily available to obtain, however, by simply specifying the term crossover Once you install the correct cable, you should configure your terminal device to operate at 9600 baud, eight data bits, no parity, and one stop bit

figure 1-7

Once the layer 1 and 2 problems have been resolved, only the Network layer remains to be checked in our scenario We know that with IGRP, routing information is exchanged only between systems belonging to the same Autonomous System number By reviewing the router configurations, we see that router 2 has a different AS number than router 1 and 3 Changing the AS to match enables all routers to share route information, which resolves problem 4 All routers can now ping one other again, because IGRP can now update each router's routing table with the necessary information