CCNA2 - Module 3&4 Flashcards

1
Q

are logical connections with other similar devices.

A

VLANs

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2
Q

Benefits of VLAN Design:

A
  1. Smaller Broadcast Domains: Dividing the LAN reduces the number of broadcast domains.
  2. Improved Security: Only users in the same VLAN can communicate together.
  3. Improved IT Efficiency: VLANs can group devices with similar requirements, e.g., faculty vs. students.
  4. Reduced Cost: One switch can support multiple groups or VLANs.
  5. Better Performance: Small broadcast domains reduce traffic, improving bandwidth.
  6. Simpler Management: Similar groups will need similar applications and other network resources.
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3
Q

VLAN 1 is the following: ​
* The default VLAN​
* The default Native VLAN​
* The default Management VLAN​
* Cannot be deleted or renamed​

Note: While we cannot delete VLAN1 Cisco will recommend that we assign these default features to other VLANs​

A

Default VLAN

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4
Q

Dedicated to user-generated traffic (email and web traffic). ​

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

A

Data VLAN

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5
Q

This is used for trunk links only. ​

All frames are tagged on an 802.1Q trunk link except for those on the native VLAN.

A

Native VLAN

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6
Q

This is used for SSH/Telnet VTY traffic and should not be carried with end user traffic.​

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

A

Management VLAN

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7
Q

A separate VLAN is required because Voice traffic requires:​
* Assured bandwidth​
* High QoS priority​
* Ability to avoid congestion​
* Delay less that 150 ms from source to destination​
The entire network must be designed to support voice.​

A

Voice VLAN

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8
Q

is a point-to-point link between two network devices(VLAN).

A

trunk

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9
Q

Without ____, all devices connected to the switches will receive all unicast, multicast, and broadcast traffic.​

A

VLANs

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10
Q

With VLANs, unicast, multicast, and broadcast traffic is confined to a VLAN. Without a _____ to connect the VLANs, devices in different VLANs cannot communicate. ​

A

Layer 3 device

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11
Q
  • 2-byte field with hexadecimal
  • reffered as Tag Protocol ID (TPID)
  • 3-bit user priority
  • 1-bit Canonical Format Identifier (CFI)
  • 12-bit vlan up to 4069
A

802.1Q

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12
Q
  • tagged with appropriate layer 2 class of service priority value
A

voice VLAN

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13
Q

The ______ command can show us both data and voice VLANs assigned to the interface.​

A

show interfaces fa0/18 switchport

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14
Q

Native vs Extended Range VLAN

A

Normal Range VLAN 1 - 1005
* Used in Small to Medium sized businesses
* 1002 - 1005 are reserved for legacy VLANs
* 1, 1002 - 1005 are auto created and cannot be deleted
* Stored in the vlan.dat file in flash
* VTP can synchronize between switches

Extended Range VLAN 1006 - 4095
* Used by Service Providers
* Are in Running-Config
* Supports fewer VLAN features
* Requires VTP configurations

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15
Q

Commands to verify VLAN info

A

brief Display VLAN name, status, and its ports one VLAN per line.​
id vlan-id Display information about the identified VLAN ID number. ​
name vlan-name Display information about the identified VLAN name. The vlan-name is an ASCII string from 1 to 32 characters.​
summary Display VLAN summary information.​

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16
Q

use the______ to place interface back in VLAN 1 & change VLAN port membership​

A

no switchport access vlan

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17
Q

command to delete all VLANS

A

delete flash:vlan.dat or delete vlan.dat

18
Q

Is set to trunk administratively​
Is set as trunk operationally (functioning)​
Encapsulation is dot1q​

A

sh int fa0/1 switchport command

19
Q

reset trunk to the default state

A

no sw trunk alllowed vlan
no sw trunk native vlan

20
Q

is a proprietary Cisco protocol.​

characteristics are as follows:​

  • On by default on Catalyst 2960 and 2950 switches​
  • Dynamic-auto is default on the 2960 and 2950 switches​
  • May be turned off with the nonegotiate command​
  • May be turned back on by setting the interface to dynamic-auto​
  • Setting a switch to a static trunk or static access will avoid negotiation issues with the switchport mode trunk or the switchport mode access commands.
A

Dynamic Trunking Protocol (DTP)

21
Q

interface configuration command to stop DTP negotiation.​

A

switchport nonegotiate

22
Q

negotiated int modes

A
  1. access:
    Permanent access mode and negotiates to convert the neighboring link into an access link.
  2. dynamic auto:
    Will become a trunk interface if the neighboring interface is set to trunk or desirable mode.
  3. dynamic desirable:
    Actively seeks to become a trunk by negotiating with other auto or desirable interfaces.
  4. trunk:
    Permanent trunking mode and negotiates to convert the neighboring link into a trunk link.
23
Q

command to determine the current DTP mode

A

show dtp interface f0/1

24
Q

are used to segment switched Layer 2 networks for a variety of reasons. Regardless of the reason, hosts in one VLAN cannot communicate with hosts in another VLAN unless there is a router or a Layer 3 switch to provide routing services.​

25
Q

is the process of forwarding network traffic from one VLAN to another VLAN.

A

Inter-VLAN routing

26
Q

There are three inter-VLAN routing options:

A

Legacy Inter-VLAN routing - This is a legacy solution. It does not scale well.​
Router-on-a-Stick - This is an acceptable solution for a small to medium-sized network.​
Layer 3 switch using switched virtual interfaces (SVIs) - This is the most scalable solution for medium to large organizations.​

27
Q

The first inter-VLAN routing solution relied on using a router with multiple Ethernet interfaces. Each router interface was connected to a switch port in different VLANs. The router interfaces served as the default gateways to the local hosts on the VLAN subnet.​

using physical interfaces works, but it has a significant limitation. It is not reasonably scalable because routers have a limited number of physical interfaces. Requiring one physical router interface per VLAN quickly exhausts the physical interface capacity of a router.​

Note: This method of inter-VLAN routing is no longer implemented in switched networks and is included for explanation purposes only.

A

Legacy inter-VLAN routing

28
Q

method overcomes the limitation of the legacy inter-VLAN routing method. It only requires one physical Ethernet interface to route traffic between multiple VLANs on a network.​
* has subinterfaces
* max of 50 VLANS

A

‘router-on-a-stick’ inter-VLAN routing

29
Q

The modern method of performing is to use Layer 3 switches and switched virtual interfaces (SVI). An SVI is a virtual interface that is configured on a Layer 3 switch, as shown in the figure.​
layer 3 == multilayer switch

A

inter-VLAN routing

30
Q

are created the same way that the management VLAN interface is configured. The SVI is created for a VLAN that exists on the switch. Although virtual, the SVI performs the same functions for the VLAN as a router interface would. Specifically, it provides Layer 3 processing for packets that are sent to or from all switch ports associated with that VLAN.​
* much faster
* increase bandwidth
* more expensive

A

Inter-VLAN SVIs

31
Q
  • This command configures the subinterface to respond to 802.1Q encapsulated traffic from the specified vlan-id. The native keyword option is only appended to set the native VLAN to something other than VLAN 1.
A

encapsulation dot1q vlan_id [native]

32
Q
  • This command configures the IPv4 address of the subinterface. This address typically serves as the default gateway for the identified VLAN.​
A

ip address ip-address subnet-mask

33
Q

Common Inter-VLAN Issues

A
  1. Missing VLANs
    How to Fix: Create (or re-create) the VLAN if it does not exist. Ensure the host port is assigned to the correct VLAN.
    How to Verify: Use commands: show vlan [brief], show interfaces switchport, ping.
  2. Switch Trunk Port Issues
    How to Fix: Ensure trunks are configured correctly. Ensure the port is a trunk port and enabled.
    How to Verify: Use commands: show interface trunk, show running-config.
  3. Switch Access Port Issues
    How to Fix: Assign the correct VLAN to the access port. Ensure the port is an access port and enabled. Host may be incorrectly configured in the wrong subnet.
    How to Verify: Use commands: show interfaces switchport, show running-config interface, ipconfig.
  4. Router Configuration Issues
    How to Fix: Router subinterface IPv4 address is incorrectly configured. Router subinterface should be assigned to the VLAN ID.
    How to Verify: Use commands: show ip interface brief, show interfaces.
34
Q
  1. Missing VLANs
A

How to Fix: Create (or re-create) the VLAN if it does not exist. Ensure the host port is assigned to the correct VLAN.
How to Verify: Use commands: show vlan [brief], show interfaces switchport, ping.

35
Q
  1. Switch Trunk Port Issues
A

How to Fix: Ensure trunks are configured correctly. Ensure the port is a trunk port and enabled.
How to Verify: Use commands: show interface trunk, show running-config.

36
Q
  1. Switch Access Port Issues
A

How to Fix: Assign the correct VLAN to the access port. Ensure the port is an access port and enabled. Host may be incorrectly configured in the wrong subnet.
How to Verify: Use commands: show interfaces switchport, show running-config interface, ipconfig.

37
Q
  1. Router Configuration Issues
A

How to Fix: Router subinterface IPv4 address is incorrectly configured. Router subinterface should be assigned to the VLAN ID.
How to Verify: Use commands: show ip interface brief, show interfaces.

38
Q

Verify that the port connecting to the router is correctly configured as a trunk link using the .​

A

show interface trunk command

39
Q

If that port is missing from the output, examine the configuration of the port with the _____ command to see how the port is configured.​

A

show running-config interface X

40
Q
  • correct address but unable to ping its default gateway
    show vlan brief
    show int X sw
    show run int X
A

switch access port issues

41
Q

is created using the interface interface_id subinterface_id global configuration mode command. ​

A

subinterface