VLAN & Trunking Flashcards

1
Q

How many CAM tables are on a switch?

A

One CAM table per VLAN. When a VLAN is created a CAM table is also created.

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2
Q

Fact:

A

Traffic within the same VLAN must be switched.

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3
Q

Fact:

A

Traffic outside or between VLAN’s but be routed.

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4
Q

How many bits defines a VLAN?

A

12 bit field defines a VLAN (2-4094)

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5
Q

Where are VLAN’s Stored

A

VLAN.DAT file

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6
Q

Normal VLAN Range?

A

1-1005 1=default 1002/1004=FDDI 1003/1005= Token Ring

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7
Q

What categories do L2 switchports fall into?

A

Access Ports, Trunk Ports, Dynamic switch ports (DTP).

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8
Q

What are two types of Trunk Encapsulation?

A

ISL =26byte header & 4 byte trailer encapsulated around the Frame 802.1q=4byte embedded into the Frame

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9
Q

Define and Configure DTP

A

(config-if)switchport

Dynamic Trunking Protocol. Automatically choose port for Access or Trunk Mode.

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10
Q

What order does DTP try to form?

A
  1. Trunk ISL
  2. Trunk 802.1q
  3. Access
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11
Q

Describe 802.1q tagging

A

16 bit = Ethernet Type

3 bit = COS

1 bit CFI

12 bit = VLAN id

Untagged frames are assumed to be the native VLAN. Modifies original Frame. Embedds tagging.

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12
Q

Describe ISL

A

Does not modify the frame

ISL encapsulates the entire frame

26 byte header & 4 byte trailer (FCS) Double tagging

addes 30bytes to each frame. High overhead.

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13
Q

How do you disable DTP?

A

switchport no negotiate

or

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14
Q

What are 2 types of Etherchannel?

A
  • PAgP (Cisco Proprietary)
  • LACP (IEEE Standard)
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15
Q

What must match between interfaces to form etherchannel?

A
  • Duplex has to be the same.
  • Speed has to be there same.
  • Same native AND allowed VLANs.
  • Same switchport mode (access or trunk).
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16
Q

How do you configure PAgP etherchannel?

A

interface port-channel 10

switchport mode trunk

interface fastehternet 0/10 [11]

channel-group 10 mode [Auto/Desirable]

17
Q

How do you configure LACP etherchannel?

A

interface port-channel 10

switchport mode trunk

interface fastehternet 0/10 [11]

channel-group 10 mode [active/passive]

18
Q

How many interface can be in a port channel?

A

8

19
Q

Why do you always assign an even number of interfaces in a port channel?

A

Because a Port channel can not properly load balance with an odd number of links.