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Cisco CCNA 3 Routing and Switching, Exercises of Computer Networks

Anton de Kom University Computer Networks

Cisco CCNA 3 Routing and Switching Instructor Lab Manual

Typology: Exercises

2016/2017

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CCNA Routing and Switching:

Scaling Networks

Instructor Lab Manual

This document is exclusive property of Cisco Systems, Inc. Permission is granted

to print and copy this document for non-commercial distribution and exclusive

use by instructors in the CCNA 5RXWLQJDQG6ZLWFKLQJ6FDOLQJ1HWZRUNV course

as part of an official Cisco Networking Academy Program.

Discover Exercises of Computer Networks Anton de Kom University

Partial preview of the text

Download Cisco CCNA 3 Routing and Switching and more Exercises Computer Networks in PDF only on Docsity!

CCNA Routing and Switching:

Scaling Networks

Instructor Lab Manual

This document is exclusive property of Cisco Systems, Inc. Permission is granted to print and copy this document for non-commercial distribution and exclusive use by instructors in the CCNA Routing and Switching: Scaling Networks course as part of an official Cisco Networking Academy Program.

Network by Design (Instructor Version)

Instructor Note : Red font color or Gray highlights indicate text that appears in the instructor copy only.

Objective

Explain the need to design a hierarchical network that is scalable.

Instructor Note: This activity can be completed by individuals or groups of two students. It can then be shared with another individual, group, class, or the instructor.

Scenario

Your employer is opening a new, branch office.

You have been reassigned to the site as the network administrator where your job will be to design and maintain the new branch network.

The network administrators at the other branches used the Cisco three-layer hierarchical model when designing their networks. You decide to use the same approach.

To get an idea of what using the hierarchical model can do to enhance the design process, you research the topic.

Resources

 World Wide Web access

 Word processing software

Directions

Step 1: Use the Internet to find information and take notes about the Cisco three-layer

hierarchical model. The site should include information about the:

a. Access layer b. Distribution layer c. Core layer

Step 2: In your research, make sure to include:

a. A simple definition of each hierarchical layer b. Three concise facts about each layer c. Network device capabilities needed at each layer d. A detailed graphic that shows a full, three-layer hierarchical model design

Step 3: Create a simple table to organize and share your research with another student, group,

the class, or instructor.

Identify elements of the model that map to IT-related content:

 Network design  Cisco three-layer hierarchical model  Access layer  Distribution layer  Core layer

Lab – Selecting Switching Hardware (Instructor Version)

Instructor Note : Red font color or Gray highlights indicate text that appears in the instructor copy only.

Objectives

Part 1: Explore Cisco Switch Products Part 2: Select an Access Layer Switch Part 3: Select a Distribution/Core Layer Switch

Background / Scenario

As a Network Engineer, you are part of a team that selects appropriate devices for your network. You need to consider the network requirements for the company as they migrate to a converged network. This converged network supports voice over IP (VoIP), video streaming, and expansion of the company to support a larger customer base. For a small- to medium-sized company, Cisco hierarchical network design suggests only using a two-tier LAN design. This design consists of an access layer and a collapsed core/distribution layer. Network switches come in different form factors, and with various features and functions. When selecting a switch, the team must choose between fixed configuration or modular configuration, and stackable or non-stackable switches. Based on a given set of requirements, you will identify the Cisco switch models and features to support the requirements. The scope of this lab will limit the switch models to campus LAN only.

Required Resources

PC with Internet access

Part 1: Explore Cisco Switch Products

In Part 1, you will navigate the Cisco website and explore available switch products.

Step 1: Navigate the Cisco website.

At www.cisco.com, a list of available products and information about these products is available. a. From the home page, click Products & Services > Switches.

Step 2: Explore switch products.

In the Feature Products section, a list of different categories of switches is displayed. In this lab, you will explore the campus LAN switches. You can click different links to gather information about the different switch models. On this page, the information is organized in different ways. You can view all available switches by

Lab – Selecting Switching Hardware

Model Uplink Speed

Number of Ports/Speed Other Features

Catalyst 2960 2x1GE uplink 8, 24, and 48 FE ports

PoE+, advanced QoS, rate- limiting, ACLs, IPv6, multicast, Fixed configuration

Catalyst 3560-X and 3750 - X

4x1GE or 10GE uplink ports (optional)

12, 24, and 48 FE/GE ports

QoS, PoE+, hot swappable power supplies, cooling fans and network modules, StackPower and StackWise, Fixed configuration

c. Click the heading Campus LAN – Compact Switches. List a few models and some of features in the table below.

Model Uplink Speed Number of Ports/Speed Other Features

Catalyst 3560-C 2x1GE uplink 8 - 12 FE/GE ports

Collocate with users, PoE+, Fixed configuration

Catalyst 2960-C 2x1GE uplink 8 - 12 FE/GE ports

Collocate with users, PoE / PoE pass-through, Fixed configuration

Part 2: Select an Access Layer Switch

The main function of an access layer switch is to provide network access to end user devices. This switch connects to the core/distribution layer switches. Access switches are usually located in the intermediate distribution frame (IDF). An IDF is mainly used for managing and interconnecting the telecommunications cables between end user devices and a main distribution frame (MDF). There are typically multiple IDFs with uplinks to a single centralized MDF. An access switch should have the following capabilities: low cost per switch port, high port density, scalable uplinks to higher layers, and user access functions and resiliency. In Part 2, you will select an access switch based on the requirements set by the company. You have reviewed and become familiar with Cisco switch product line.

Lab – Selecting Switching Hardware

a. Company A requires a replacement access switch in the wiring closet. The company requires the switch to support VoIP and multicast, accommodate future growth of users and increased bandwidth usage. The switch must support a minimum of 35 current users and have a high-speed uplink. List a few of models that meet those requirements.

Answers will vary. 2960-S or 3560 - X with 48 port capacity and at least two 1G/10G uplinks b. Company B would like to extend services to a conference room on an as-needed basis. The switch will be placed on the conference room table, and switch security is a priority.

Answers will vary. A Compact LAN switch such as the 2960 - C

Part 3: Select a Distribution/Core Layer Switch

The distribution/core switch is the backbone of the network for the company. A reliable network core is of paramount importance for the function of the company. A network backbone switch provides both adequate capacity for current and future traffic requirements and resilience in the event of failure. They also require high throughput, high availability, and advanced quality of service (QoS). These switches usually reside in the main wiring closet (MDF) along with high speed servers, routers, and the termination point of your ISP.

Layered Network Design Simulation (Instructor Version)

Instructor Note : Red font color or Gray highlights indicate text that appears in the instructor copy only.

Objective

Explain the need to design a hierarchical network that is scalable.

Instructor Note: This activity is can be completed by individual students or groups of two students. It can then be shared with another individual, group, class, or the instructor.

Scenario

As the network administrator for a very small network, you want to prepare a simulated-network presentation for your branch manager to explain how the network currently operates.

The small network includes the following equipment:

 One 2911 series router

 One 3560 switch

 One 2960 switch

 Four user workstations (PCs or laptops)

 One printer

For further instructions on how to complete this activity, open the accompanying PDF.

Resources

 Packet Tracer software

Directions

Step 1: Create a simple network topology using Packet Tracer software. Place the devices at

the appropriate levels of the Cisco three-layer hierarchical model design. Include:

a. One 2911 series router b. One 3560 switch c. One 2960 switch d. Four user workstations (PCs or laptops) e. One printer

Step 2: Using Packet Tracer’s drawing tool and indicate the hierarchical layers with different

color coding and labels:

a. Access Layer b. Distribution Layer c. Core Layer

Layered Network Design Simulation

Step 3: Configure the network and user devices. Check for end-to-end connectivity.

Step 4: Share your configuration and hierarchical network design Packet Tracer file with

another student, group, the class, or the instructor.

Identify elements of the model that map to IT-related content:

 Spanning Tree Protocol (STP)  Broadcast storms  Switching loops  IEEE STP standards (802.1D, 802.1S, 802.1I)

Lab – Building a Switched Network with Redundant Links

(Instructor Version)

Instructor Note : Red font color or Gray highlights indicate text that appears in the instructor copy only.

Topology

Addressing Table

Device Interface IP Address Subnet Mask

S1 VLAN 1 192.168.1.1 255.255.255.

S2 VLAN 1 192.168.1.2 255.255.255.

S3 VLAN 1 192.168.1.3 255.255.255.

Objectives

Part 1: Build the Network and Configure Basic Device Settings Part 2: Determine the Root Bridge Part 3: Observe STP Port Selection Based on Port Cost Part 4: Observe STP Port Selection Based on Port Priority

Background / Scenario

Redundancy increases the availability of devices in the network topology by protecting the network from a single point of failure. Redundancy in a switched network is accomplished through the use of multiple switches or multiple links between switches. When physical redundancy is introduced into a network design, loops and duplicate frames can occur. The Spanning Tree Protocol (STP) was developed as a Layer 2 loop-avoidance mechanism for redundant links in a switched network. STP ensures that there is only one logical path between all destinations on the network by intentionally blocking redundant paths that could cause a loop. In this lab, you will use the show spanning-tree command to observe the STP election process of the root bridge. You will also observe the port selection process based on cost and priority.

Lab – Building a Switched Network with Redundant Links

An election process determines which switch becomes the root bridge. The switch with the lowest bridge identifier (BID) becomes the root bridge. The BID is made up of a bridge priority value, an extended system ID, and the MAC address of the switch. The priority value can range from 0 to 65,535, in increments of 4,096, with a default value of 32,768.

Step 1: Deactivate all ports on the switches.

S1(config)# interface range f0/1-24, g0/1- S1(config-if-range)# shutdown S1(config-if-range)# end

S2(config)# interface range f0/1-24, g0/1- S2(config-if-range)# shutdown S2(config-if-range)# end

S3(config)# interface range f0/1-24, g0/1- S3(config-if-range)# shutdown S3(config-if-range)# end

Step 2: Configure connected ports as trunks.

S1(config)# interface range f0/1- S1(config-if-range)# switchport mode trunk S1(config-if-range)# end

S2(config)# interface range f0/1- S2(config-if-range)# switchport mode trunk S2(config-if-range)# end

S3(config)# interface range f0/1- S3(config-if-range)# switchport mode trunk S3(config-if-range)# end

Step 3: Activate ports F0/2 and F0/4 on all switches.

S1(config)# interface range f0/2, f0/ S1(config-if-range)# no shutdown S1(config-if-range)# end

S2(config)# interface range f0/2, f0/ S2(config-if-range)# no shutdown S2(config-if-range)# end

S3(config)# interface range f0/2, f0/ S3(config-if-range)# no shutdown S3(config-if-range)# end

Lab – Building a Switched Network with Redundant Links

Step 4: Display spanning tree information.

Issue the show spanning-tree command on all three switches. The Bridge ID Priority is calculated by adding the priority value and the extended system ID. The extended system ID is always the VLAN number. In the example below, all three switches have equal Bridge ID Priority values (32769 = 32768 + 1, where default priority = 32768, VLAN number = 1); therefore, the switch with the lowest MAC address becomes the root bridge (S2 in the example). S1# show spanning-tree

VLAN Spanning tree enabled protocol ieee Root ID Priority 32769 Address 0cd9.96d2. Cost 19 Port 2 (FastEthernet0/2) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0cd9.96e8.8a Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

Fa0/2 Root FWD 19 128.2 P2p Fa0/4 Altn BLK 19 128.4 P2p

S2# show spanning-tree

VLAN Spanning tree enabled protocol ieee Root ID Priority 32769 Address 0cd9.96d2. This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0cd9.96d2. Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

Fa0/2 Desg FWD 19 128.2 P2p Fa0/4 Desg FWD 19 128.4 P2p

S3# show spanning-tree

VLAN

Cisco CCNA 3 Routing and Switching, Exercises of Computer Networks

Related documents

Partial preview of the text

Download Cisco CCNA 3 Routing and Switching and more Exercises Computer Networks in PDF only on Docsity!

CCNA Routing and Switching:

Scaling Networks

Instructor Lab Manual

Network by Design (Instructor Version)

Objective

Scenario

Resources

Directions

Step 1: Use the Internet to find information and take notes about the Cisco three-layer

hierarchical model. The site should include information about the:

Step 2: In your research, make sure to include:

Step 3: Create a simple table to organize and share your research with another student, group,

the class, or instructor.

Suggested Activity Example Solution: (information based on The Cisco Three-Layered

Hierarchical Model and LAN Design)

Identify elements of the model that map to IT-related content:

Lab – Selecting Switching Hardware (Instructor Version)

Objectives

Background / Scenario

Required Resources

Step 1: Navigate the Cisco website.

Step 2: Explore switch products.

Layered Network Design Simulation (Instructor Version)

Objective

Scenario

Resources

Directions

Step 1: Create a simple network topology using Packet Tracer software. Place the devices at

the appropriate levels of the Cisco three-layer hierarchical model design. Include:

Step 2: Using Packet Tracer’s drawing tool and indicate the hierarchical layers with different

color coding and labels:

Step 3: Configure the network and user devices. Check for end-to-end connectivity.

Step 4: Share your configuration and hierarchical network design Packet Tracer file with

another student, group, the class, or the instructor.

Suggested Activity Example Solution:

2960 Fixed Switch Configuration:

2911 Router Configuration

Identify elements of the model that map to IT-related content:

_______________________________________________________________________________________

Identify elements of the model that map to IT-related content:

Lab – Building a Switched Network with Redundant Links

(Instructor Version)

Topology

Addressing Table

Objectives

Background / Scenario

Step 1: Deactivate all ports on the switches.

Step 2: Configure connected ports as trunks.

Step 3: Activate ports F0/2 and F0/4 on all switches.

Step 4: Display spanning tree information.