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ClSC0 > VLAN/VTP/DTP commands > Flashcards

VLAN/VTP/DTP commands Flashcards

1
Q

How do you view VLAN info on a switch?

A

sh vlan brief

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2
Q

How do you view VLAN info on a specific interface?

A

sh interface gig0/1 switchport

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3
Q

How do you configure a port as a trunk port?

A

()interface gig0/1

(if)switch mode trunk

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4
Q

How do you configure a port as an access port?

A

()interface gig0/1

(if)switch mode access

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5
Q

How do you add a port to VLAN 10?

A

()interface gig0/1

(if)switchport access vlan 10

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6
Q

What is good practice when configuring ports?

A

give a name and description for the port

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7
Q

How do you configure VLAN 75 as the native vlan?

A

First select unused VLAN.
()vlan 75
(vlan)name Native

Then
()interface gig0/1
(if)switchport mode trunk
(if)switchport native vlan 75

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8
Q

On older switches you must do what when configuring every single trunk interface?

How do you do this?

A

You must specify the trunking protocol to be used because they support both Inter-switch Link (ISL) and 802.1Q, they default to ISL.

(if)switchport trunk encapsulation dot1q

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9
Q

How do you limit allowed VLANS?

A

Navigate to the trunk port with
()interface GigabitEthernet 0/1

List allowed VLANs, there is an implicit deny. (if)switchport trunk allowed vlan 10,30

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10
Q

What is DTP and how do you disable it if it’s on by default?

A

Dynamic Trunking Protocol allows switches to automatically negotiate trunk connections.
(f)switchport nonegotiate

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11
Q

How do you change a switch port to DTP desirable?

A

(if)switchport mode dynamic desirable

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12
Q

How do you change a switch port to DTP auto?

A

(if)switchport mode dynamic auto

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13
Q

DTP is not recommended, what should you do instead for trunking?

A

manual configuration using these as needed.

(if) switchport mode access
(if) switchport mode trunk

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14
Q

What is VTP?

A

VLAN Trunking Protocol.
It allows switches to automatically populate VLAN databases to reduce the amount of maintenance needed for large campus networks.

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15
Q

How does VTP work?

A
  • Switches are configured either as VTP clients, VTP transparent, or VTP servers.
  • VTP client switches will automatically synchronize their VLAN database with that of the VTP server.
  • VTP transparent devices do not participate but will forward VTP requests.
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16
Q

What is the default VTP state switches?

A

Server.
This is very dangerous because the switch has no VLANs by default, adding it to the network will erase VTP client’s VLAN tables.

17
Q

A technician working on a VTP enabled device is unable to manually add VLANs, what is the likely cause.

How do you fix it?

A

It is in VTP client mode.

()vtp mode transparent

18
Q

A VTP enabled device is unable to automatically add VLANs from the server, what is the cause?

How do you fix this?

A

The device is in VTP transparent mode

()vtp mode client

19
Q

What is a revision number?

A

The VTP server priority, the higher the number the more priority its VTP updates have over other servers.

20
Q

If you are using both VTP and DTP at the same time, what needs to be configured?

How do you do this?

A

The VTP domain name must match on all neighboring switches for trunks to form.

()vtp domain NAMEHERE

21
Q

How do you verify VTP is working properly?

A 
#sh vtp status
#sh vlan brief
22
Q

What are the three methods of inter-VLAN communication?

A

Separate router interfaces - One physical cable and one physical port for each VLAN on the switch.

Router on a stick - Single cable with multiple virtual interfaces and a single physical trunk port on the switch.

L3 switch - most commonly used method

23
Q

What is the advantage and disadvantage of router-on-a-stick for inter-VLAN routing over the other two methods?

A

You save interfaces on the switch compared to separate-interface method. And you don’t need to buy an expensive L3 switch.

There is more contention for bandwidth because it all goes through a single Ethernet Cable and still needs to go through a router.

24
Q

L3 switch method requires what additional configurations? How do you do them?

A

The port on the L3 switch needs to be converted into a layer 3 interface for the WAN link. And that L3 interface needs same default gateway as WAN port on router.
Enable routing with:
L3SW ()ip routing
Then add IPs to each vlan interface.

For router link:
L3SW ()interface fast0/1
L3SW (if)no switchport
L3SW (if) ip address 1.1.1.1 255.255.255.0
L3SW (if) ip route 0.0.0.0 0.0.0.0 1.1.1.2

On router:
Add ip to L3 switch link, default gateway leading to WAN link.
Add route on WAN link for the VLANs leading to the L3 switch link:
ip route 10.10.0.0 255.255.255.0 1.1.1.1

ClSC0 (18 decks)

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