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Routing > Module 3 > Flashcards

Module 3 Flashcards

1
Q

What is a VLAN?

A

VLANs are logical connections with other similar devices.

VLANs provide segmentation, organization, and isolation of broadcast traffic.

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2
Q

What are the benefits of using VLANs?

A
  • Smaller broadcast domains
  • Improved security
  • Improved IT efficiency
  • Reduced cost
  • Better performance
  • Simpler management

VLANs help in managing network traffic and resources effectively.

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3
Q

What is the default VLAN in Cisco switches?

A

VLAN 1 is the default VLAN, the default Native VLAN, and the default Management VLAN.

VLAN 1 cannot be deleted or renamed.

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4
Q

What is a Data VLAN?

A

Dedicated to user-generated traffic (e.g., email and web traffic).

VLAN 1 is the default data VLAN because all interfaces are assigned to this VLAN.

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5
Q

What is a Native VLAN?

A

Used for trunk links only; all frames are tagged on an 802.1Q trunk link except for those on the native VLAN.

By default, VLAN 1 is the native VLAN.

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6
Q

What is a Management VLAN?

A

Used for SSH/Telnet VTY traffic and should not be carried with end user traffic.

Typically, it is the VLAN that is the SVI for the Layer 2 switch.

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7
Q

What is a Voice VLAN?

A

A separate VLAN required for voice traffic, ensuring assured bandwidth and high QoS priority.

It must avoid congestion and have a delay of less than 150 ms.

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8
Q

Define a trunk in networking.

A

A trunk is a point-to-point link between two network devices that allows more than one VLAN.

It extends the VLAN across the entire network.

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9
Q

What happens in a network without VLANs?

A

All devices connected to the switches will receive all unicast, multicast, and broadcast traffic.

This can lead to network congestion and inefficiency.

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10
Q

What is the purpose of the IEEE 802.1Q header?

A

The 802.1Q header is used for VLAN tagging, allowing identification of VLANs and controlling traffic.

It includes a 12-bit VLAN ID that can support up to 4096 VLANs.

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11
Q

What is the command to create a VLAN in Cisco IOS?

A

Switch(config)# vlan vlan-id

Replace ‘vlan-id’ with the desired VLAN number.

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12
Q

What command is used to assign a port to a VLAN?

A

Switch(config-if)# switchport access vlan vlan-id

This command assigns the specified VLAN to the access port.

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13
Q

How do you verify VLAN information?

A

Use the command: show vlan [brief | id vlan-id | name vlan-name | summary]

This command provides details about VLAN configurations.

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14
Q

What is Dynamic Trunking Protocol (DTP)?

A

DTP is a proprietary Cisco protocol that negotiates trunk links between switches.

It is on by default on Catalyst 2960 and 2950 switches.

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15
Q

What is the command to set a port to trunk mode?

A

Switch(config-if)# switchport mode trunk

This command configures the port to carry traffic for all VLANs.

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16
Q

True or False: The native VLAN can be configured differently on each end of a trunk link.

A

True

Each trunk can have different native VLANs configured.

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17
Q

What command is used to delete a VLAN?

A

no vlan vlan-id

Ensure to reassign all member ports to a different VLAN before deletion.

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18
Q

Fill in the blank: A VLAN is used to create _______ in a network.

A

segmentation

This helps in isolating broadcast traffic and improving security.

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19
Q

What command is used to stop DTP negotiation?

A

switchport nonegotiate

This command is used in interface configuration mode.

20
Q

What does the ‘access’ switchport mode do?

A

Permanent access mode and negotiates to convert the neighboring link into an access link.

21
Q

What happens when a switchport is set to ‘dynamic auto’?

A

Will become a trunk interface if the neighboring interface is set to trunk or desirable mode.

22
Q

What is the purpose of ‘dynamic desirable’ switchport mode?

A

Actively seeks to become a trunk by negotiating with other auto or desirable interfaces.

23
Q

What does ‘trunk’ switchport mode signify?

A

Permanent trunking mode and negotiates to convert the neighboring link into a trunk link.

24
Q

What command can be used to determine the current DTP mode?

A

show dtp interface

25
Q

What is the default DTP configuration dependent on?

A

The Cisco IOS version and platform.

26
Q

What is the best practice regarding DTP configuration?

A

Set interfaces to access or trunk and turn off DTP.

27
Q

What are VLANs based on?

A

Logical instead of physical connections.

28
Q

How can VLANs segment networks?

A

Based on function, team, or application.

29
Q

What is a trunk in networking?

A

A point-to-point link that carries more than one VLAN.

30
Q

What fields are included in a VLAN tag?

A
  • Type
  • User priority
  • CFI
  • VID
31
Q

What is required to support VoIP in VLANs?

A

A separate voice VLAN.

32
Q

Where are normal range VLAN configurations stored?

A

In the vlan.dat file in flash.

33
Q

How many data VLANs can an access port belong to at one time?

A

One data VLAN, but may also have a Voice VLAN.

34
Q

What is a Layer 2 link between two switches that carries traffic for all VLANs?

A

A trunk.

35
Q

What tagging method is typically used for VLANs?

A

802.1Q tagging.

36
Q

What is the native VLAN in IEEE 802.1Q tagging?

A

A VLAN that will remain untagged.

37
Q

What does DTP stand for?

A

Dynamic Trunking Protocol.

38
Q

Is DTP a proprietary protocol?

A

True.

39
Q

What is the purpose of VLAN Segmentation?

A

To create separate logical networks within the same physical network.

40
Q

What command shows a brief summary of VLANs?

A

show vlan brief.

41
Q

Fill in the blank: _______ is the command to delete the vlan.dat file.

A

delete vlan.dat

42
Q

What command is used to display the status of trunk interfaces?

A

show interfaces trunk.

43
Q

What command can be used to configure an interface as a trunk?

A

switchport mode trunk.

44
Q

What command allows specific VLANs on a trunk link?

A

switchport trunk allowed vlan vlan_list.

45
Q

What command removes a VLAN from an access port?

A

no switchport access vlan vlan_id.

Routing (19 decks)

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