Configuring Multilayer Switches with VLANs in Cisco Environment

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Questions and Answers

What is the primary function of a multilayer switch?

To manage network traffic at the physical layer

To perform both Layer 2 switching and Layer 3 routing (correct)

To provide a single point of failure for network connectivity

To act as a central hub for all network devices

What is the main goal of the configuration change described in the video?

To increase network security by isolating VLANs

To improve network performance by reducing latency

To eliminate the need for a separate router (correct)

To centralize network management on a single device

What are the two VLANs mentioned in the video?

VLAN 10 and VLAN 20 (correct)

VLAN 1000 and VLAN 2000

VLAN 1 and VLAN 2

VLAN 100 and VLAN 200

What is the purpose of creating logical Layer 3 interfaces on the switch?

To allow the switch to act as the default gateway for each subnet Signup and view all the answers

What is the role of the DHCP server in this scenario?

To assign dynamic IP addresses to devices on VLANs 10 and 20 Signup and view all the answers

How is the reachability of devices on different subnets tested in the video?

By pinging from a device on VLAN 10 to a device on VLAN 20 Signup and view all the answers

What is the significance of the switch's ability to act as the default gateway for each subnet?

It simplifies network administration by eliminating the need for separate routing devices Signup and view all the answers

What is the potential benefit of integrating DHCP services into the multilayer switch?

Reduced network complexity by eliminating the need for a separate DHCP server Signup and view all the answers

What command is used to create a VLAN called '999'?

vlan 999 Signup and view all the answers

What command is used to disable unused ports on a switch?

shutdown Signup and view all the answers

Why is it important to assign unused ports to a bogus VLAN?

To prevent unauthorized access to the network Signup and view all the answers

What is a 'trunk' port?

A port that can support multiple VLANs Signup and view all the answers

What is the purpose of the command 'switchport mode access'?

To configure the port as an access port Signup and view all the answers

What is a logical interface?

A virtual interface that is created for a VLAN Signup and view all the answers

What is the purpose of the command 'interface vlan'?

To create a logical interface for a VLAN Signup and view all the answers

Which of the following ports are assigned to VLAN 10?

Gig 0/0 and 0/1 Signup and view all the answers

What is the purpose of assigning unused ports to a bogus VLAN and shutting them down?

To prevent unauthorized access to the network Signup and view all the answers

What is the difference between a layer 2 broadcast domain and a layer 3 broadcast domain?

Layer 2 broadcast domains are used for VLANs while layer 3 broadcast domains are used for routing Signup and view all the answers

What is the purpose of configuring a logical layer 3 interface for VLAN 10?

To serve as the default gateway for devices in VLAN 10. Signup and view all the answers

Which command would you use to ensure the SVI for VLAN 20 is operational?

no shutdown Signup and view all the answers

What is the IP address assigned to the logical layer 3 interface of VLAN 10?

10.1.10.254 Signup and view all the answers

What would happen if PC1 has the default gateway set to 10.1.10.1?

PC1 would stay within its local subnet only. Signup and view all the answers

Which of the following commands is NOT used when configuring DHCP services on the switch?

default gateway Signup and view all the answers

Which of these addresses would a DHCP pool for VLAN 20 use as its default gateway?

10.1.20.254 Signup and view all the answers

When bringing up multiple PCs after configuring DHCP, what is essential to ensure they get new IP addresses?

Powering off and rebooting them. Signup and view all the answers

What does the 'show ip interface brief' command display?

A summary of all configured interfaces with their IP addresses. Signup and view all the answers

In configuring an SVI, which of the following steps is performed first?

Enter interface configuration mode for the VLAN. Signup and view all the answers

For a logical layer 3 interface, what subnet mask is being used for both VLAN 10 and VLAN 20?

255.255.255.0 Signup and view all the answers

What is the purpose of the "show ip route" command in the context of the provided content?

To verify that the switch is functioning as a router by displaying its routing table. Signup and view all the answers

Which of the following is NOT a characteristic of switched virtual interfaces?

They are created automatically when a device is assigned to a VLAN. Signup and view all the answers

What is the implication of the statement "these multilayer switches, not only do they behave as routers if you configure them to do so, but they'll also participate with dynamic routing protocols"?

Multilayer switches can be used as routers and can also exchange routing information with other devices using dynamic routing protocols. Signup and view all the answers

What is the purpose of the DOORA process mentioned in the content?

To assign IP addresses to devices on the network. Signup and view all the answers

What is the significance of the default gateway being set to 10.1.20.254 on PC3?

It allows PC3 to communicate with devices on VLAN 10. Signup and view all the answers

What is the main challenge that the speaker introduces at the end of the content?

How to extend a single VLAN across multiple switches. Signup and view all the answers

What is the relationship between the switched virtual interfaces and the default gateway?

The default gateways are assigned to the switched virtual interfaces, which act as routers for the VLANs. Signup and view all the answers

Why is the ability of multilayer switches to participate in dynamic routing protocols considered significant?

It allows for more dynamic and efficient routing in large networks. Signup and view all the answers

What is the main advantage of using trunking to extend VLANs across multiple switches?

It provides greater flexibility and scalability for VLAN deployment. Signup and view all the answers

Study Notes

Multilayer Switch Configuration and Routing

A multilayer switch can do layer 2 switching and layer 3 routing simultaneously
Creating logical layer 3 interfaces, also known as Switch Virtual Interfaces (SVIs), allows the multilayer switch to perform routing and switching functions simultaneously. SVIs are configured by specifying the VLAN number and IP address for each interface. The IP address is used to identify the interface and enable routing functionality.
The switch can act as a default gateway for devices in each VLAN

VLAN Configuration and Security

Configure VLANs on the switch and assign them to specific ports
Use color-coding to identify VLANs (e.g., VLAN 10 and VLAN 20)
Verify VLAN configuration using the show interface status command
Disable unused ports and assign them to a bogus VLAN for security
To restrict a port to a specific VLAN, use the switchport mode access command in global configuration mode. This command configures the port to operate in access mode, allowing only devices connected to the port to send and receive packets tagged with the specified VLAN ID.

Sure, here are the different switchport modes and their explanations:

1. Access Mode: This mode is used to assign a port to a single VLAN. Devices connected to this port will only communicate within this VLAN. It's commonly used for end devices like computers and printers. The command to set this mode is:
- switchport mode access
2. Trunk Mode: This mode allows a single port to carry traffic for multiple VLANs. It is typically used to connect switches together so that all VLANs can communicate between the switches. Trunk ports use tagging to identify which VLAN each packet belongs to. The command to set this mode is:
- switchport mode trunk
3. Dynamic Auto Mode: In this mode, the port can become a trunk port if the other end of the link is set to trunk or desirable mode. It waits passively to be converted into a trunk. This is useful if you want the port to become a trunk if needed but otherwise remain in access mode. The command to set this mode is:
- switchport mode dynamic auto
4. Dynamic Desirable Mode: This mode actively attempts to convert the port to a trunk. It sends messages to the other end of the link, trying to negotiate the link to become a trunk. If the other end is set to trunk, desirable, or auto mode, it will become a trunk. The command to set this mode is:
- switchport mode dynamic desirable
5. Nonegotiate Mode: When a port is set to this mode, it will not engage in any negotiations to become a trunk. This mode is used when you don’t want a port to automatically become a trunk or you want to manually manage the trunking without auto-negotiation. It’s worth noting that to use this mode, the port must already be set to either access or trunk mode. The command to set this mode is:
- switchport nonegotiate
In summary:

- Access Mode is for single VLANs, typically for end devices.

- Trunk Mode is for multiple VLANs, typically for connecting switches.

- Dynamic Auto Mode waits to be converted to a trunk.

- Dynamic Desirable Mode proactively tries to become a trunk.

- Nonegotiate Mode disables automatic trunk negotiations.

Layer 3 Interface Configuration

Create logical layer 3 interfaces (SVIs) for each VLAN using the interface vlan command
Assign IP addresses to each SVI (e.g., 10.1.10.254 for VLAN 10 and 10.1.20.254 for VLAN 20)
Enable the SVIs using the no shutdown command

DHCP Configuration

Configure DHCP pools on the switch for each VLAN
Specify the default gateway, DNS server, and IP address range for each pool
Save the configuration using the wr command

PC Configuration and Verification

Verify that PCs obtain IP addresses from the switch's DHCP pool
Check that PCs have the correct default gateways (e.g., 10.1.10.254 for VLAN 10 and 10.1.20.254 for VLAN 20)

To check if PCs have the correct default gateways, follow these steps:

1. Windows:

a. Open Command Prompt: Press Windows Key + R, type cmd, and press Enter.

b. Type ipconfig and press Enter.

c. Look for the "Default Gateway" in the output under the respective network adapter.

2. MacOS:

a. Open Terminal: Press Command + Space, type Terminal, and press Enter.

b. Type netstat -nr | grep default and press Enter.

c. The default gateway IP address will be shown in the output.

3. Linux:

a. Open Terminal.

b. Type ip route | grep default or route -n and press Enter.

c. Look for the default gateway IP address in the output.

Ensure the default gateway matches the expected IP for the corresponding VLAN (e.g., 10.1.10.254 for VLAN 10 and 10.1.20.254 for VLAN 20).
Test ping requests between PCs in different VLANs to verify routing

IP Routing and Dynamic Routing Protocols

The multilayer switch can participate in dynamic routing protocols (e.g., OSPF) to share and learn routes
The switch can also behave as a router, routing traffic between VLANs and subnets

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Description

This quiz explores the configuration of multilayer switches with VLAN components in a Cisco environment, building on the logical understanding of multilayer switches.