Podcast
Questions and Answers
What does the command 'switchport mode access' do?
What does the command 'switchport mode access' do?
Why did the PC not receive an IP address initially?
Why did the PC not receive an IP address initially?
What is the purpose of recreating the VLAN interfaces on MLS1?
What is the purpose of recreating the VLAN interfaces on MLS1?
What is the function of the 'show interface status' command?
What is the function of the 'show interface status' command?
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What is the purpose of using the 'no interface vlan 10' and 'no interface vlan 20' commands?
What is the purpose of using the 'no interface vlan 10' and 'no interface vlan 20' commands?
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What is the purpose of the 'show ip interface brief' command?
What is the purpose of the 'show ip interface brief' command?
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Why did the capture show multiple discover messages with incorrect tags?
Why did the capture show multiple discover messages with incorrect tags?
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What is the purpose of using the display filter 'DHCP' in the capture?
What is the purpose of using the display filter 'DHCP' in the capture?
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What is the function of the 'show vlan brief' command?
What is the function of the 'show vlan brief' command?
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What is the purpose of stopping and starting the capture on the PC?
What is the purpose of stopping and starting the capture on the PC?
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Why was there no tag added to the DHCP discover message coming from PC2?
Why was there no tag added to the DHCP discover message coming from PC2?
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What is the purpose of the 802.1q tag in the demonstration?
What is the purpose of the 802.1q tag in the demonstration?
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Why did the DHCP discover messages from PC2 not receive a response?
Why did the DHCP discover messages from PC2 not receive a response?
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What type of message was sent by the device to initiate the discovery process?
What type of message was sent by the device to initiate the discovery process?
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Which of the following best describes the role of the trunk port on MLS2 in this scenario?
Which of the following best describes the role of the trunk port on MLS2 in this scenario?
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What happens to the 802.1q tag when the frame is received by MLS2?
What happens to the 802.1q tag when the frame is received by MLS2?
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Why was only one interface used between MLS1 and MLS2?
Why was only one interface used between MLS1 and MLS2?
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What is the function of the layer 3 logical interface for VLAN 10 on MLS1?
What is the function of the layer 3 logical interface for VLAN 10 on MLS1?
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What is the importance of associating end devices with the correct VLANs?
What is the importance of associating end devices with the correct VLANs?
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What is the significance of the 'native VLAN' on a trunk port?
What is the significance of the 'native VLAN' on a trunk port?
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What is the role of MLS1 in the demonstration?
What is the role of MLS1 in the demonstration?
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What command was used to verify the VLAN assignments on MLS2?
What command was used to verify the VLAN assignments on MLS2?
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What is the purpose of the switched virtual interface on MLS1?
What is the purpose of the switched virtual interface on MLS1?
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What command was used to configure Gig 0/0 on MLS2 as an access port associated with VLAN 10?
What command was used to configure Gig 0/0 on MLS2 as an access port associated with VLAN 10?
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What is the outcome of the troubleshooting process in the demonstration?
What is the outcome of the troubleshooting process in the demonstration?
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What is the purpose of capturing traffic on the trunk port between MLS2 and MLS1?
What is the purpose of capturing traffic on the trunk port between MLS2 and MLS1?
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What is the meaning of the term 'DHCP discover' as mentioned in this scenario?
What is the meaning of the term 'DHCP discover' as mentioned in this scenario?
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What is the significance of the 'layer 2 and 1/2' term used in the demonstration?
What is the significance of the 'layer 2 and 1/2' term used in the demonstration?
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What is the relevance of implementing trunking between MLS1 and MLS2?
What is the relevance of implementing trunking between MLS1 and MLS2?
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What is the primary benefit of using VLANs in a network?
What is the primary benefit of using VLANs in a network?
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What command is used to display the interfaces operating as an 802.1q trunk on a Cisco switch?
What command is used to display the interfaces operating as an 802.1q trunk on a Cisco switch?
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What encapsulation method is specified for the switchports in the configuration?
What encapsulation method is specified for the switchports in the configuration?
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Which interfaces are configured simultaneously on MLS1 for trunking?
Which interfaces are configured simultaneously on MLS1 for trunking?
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What is the main advantage of using the interface range command during configuration?
What is the main advantage of using the interface range command during configuration?
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What command follows the entry into configuration mode to set the trunk encapsulation to dot1q?
What command follows the entry into configuration mode to set the trunk encapsulation to dot1q?
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What is the purpose of using the command 'configure space terminal'?
What is the purpose of using the command 'configure space terminal'?
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Which encapsulation method is considered outdated and not used anymore?
Which encapsulation method is considered outdated and not used anymore?
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What will the 'show interface trunk' command display if no trunks are configured?
What will the 'show interface trunk' command display if no trunks are configured?
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What command is used to set a port to operate as a trunk on a Cisco multilayer switch?
What command is used to set a port to operate as a trunk on a Cisco multilayer switch?
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Which VLANs were created on MLS1 as mentioned?
Which VLANs were created on MLS1 as mentioned?
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What does the command 'no shutdown' accomplish on a Cisco device?
What does the command 'no shutdown' accomplish on a Cisco device?
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What encapsulation method is used for trunking between the devices?
What encapsulation method is used for trunking between the devices?
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What should the output indicate when running 'show interface trunk' on MLS1?
What should the output indicate when running 'show interface trunk' on MLS1?
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What function does a trunk port serve in the VLAN context?
What function does a trunk port serve in the VLAN context?
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If VLAN 20 exists already, what happens when the command to create it is sent again?
If VLAN 20 exists already, what happens when the command to create it is sent again?
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Which command confirms the VLAN configuration on all switches at once?
Which command confirms the VLAN configuration on all switches at once?
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What does the DORA process stand for in relation to DHCP?
What does the DORA process stand for in relation to DHCP?
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What happens to the broadcast discover message in VLAN 10?
What happens to the broadcast discover message in VLAN 10?
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Study Notes
Implementing VLAN Trunking with 802.1q
- Configuration of trunking between multilayer switches MLS1 and MLS2 uses 802.1q Ethernet trunks.
- Initiate trunk configuration by utilizing the command
show interface trunk
to check any existing trunk interfaces. - On MLS1 and MLS2, initially, no interfaces act as 802.1q trunks.
- Enter configuration mode on MLS1 with
configure terminal
and utilizeinterface range
command to configure multiple interfaces simultaneously (Gig 0/1, Gig 1/1). - Set trunk encapsulation to dot1q using
switchport trunk encapsulation dot1q
on both switches.
Configuring VLANs
- Change the interface mode to trunk using
switchport mode trunk
. - Ensure that VLANs exist on both switches; create VLAN 10 (HR) and VLAN 20 (Sales) on MLS2 to match with MLS1.
- Use the command
send commands to all sessions
for consistent VLAN configuration across switches.
Enabling Interfaces
- Enable interfaces using
no shutdown
command to ensure they are active and ready for trunking. - Verify trunk interface status again using
show interface trunk
, checking for active 802.1q trunks on both switches.
DHCP Process and Troubleshooting
- Understand that DHCP Discover messages initially sent by a client on VLAN 10 need proper tagging for effective handling.
- Highlight the importance of VLAN tagging during the DORA process; untagged packets indicate misconfiguration.
- Identify the need to assign correct VLANs to interfaces with commands like
switchport access vlan 10
for Gig 0/0 andswitchport access vlan 20
for Gig 0/1 on MLS2. - Confirm the configuration through commands like
show vlan brief
and ensure operational status.
Resolving Interface Issues
- If Layer 3 interfaces (SVIs) for VLANs are down, recreate them to activate functionality.
- Monitor the network traffic using packet capture; observe DHCP Discovery messages to confirm they carry the correct VLAN tag in captured frames.
Summary of Key Concepts
- Ensure switch ports are associated with the correct VLANs for successful communication.
- Maintain active Layer 3 interfaces to facilitate routing and DHCP responses efficiently.
- Trunking allows for the passage of VLAN traffic between switches, tagging frames appropriately for correct delivery.
- Utilize troubleshooting skills to identify configuration issues that may impact networking functions.
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Description
This quiz covers the implementation of trunking with 802.1q Ethernet trunks between MLS1 and MLS2, including configuring Cisco Systems' multilayer switches. The quiz focuses on the commands and configuration required for this process.