Term
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Definition
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Term
| Define the difference between a physical subnet and a logical subnet. |
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Definition
-Physical, devices that share the same wire.
-Logical, devices assigned to the same VLAN. |
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Term
| What are the two types of VLANs? |
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Definition
-End-to-End (Multi-switch VLANs)
-Local (stays on single switch) |
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Term
| What is the over-subscriber ratio of Access-to-Distribution and Distribution-to-Core? |
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Definition
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Term
| What are the commands to create a VLAN? |
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Definition
(global)
vlan ##
name MYNAME (optional) |
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Term
| What are the commands to assign a port to a VLAN? |
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Definition
(if)
switchport mode access
switchport access vlan ## |
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Term
| What are the VLAN show commands? |
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Definition
show vlan
show vlan brief
show vlan id ##
show vlan name NAME |
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Term
| What are the two methods of identifying VLANs over trunk links? (i.e. trunking methods) |
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Definition
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Term
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Definition
-Inter-Switch Link
-Cisco proprietary
-encapsulates frame in a 26-byte header containing VLAN info and a 4-byte trailer.
-Protocol-independant
-Can identify CDP and BPDU frames. |
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Term
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Definition
-Standards-based trunking protocol.
-inserts a field into the original frame after source MAC address field.
-Supports Ethernet and Token Ring. |
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Term
| When are frames tagged and untagged in trunking? |
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Definition
-Frames are tagged when leaving on a trunk, and untagged when arriving on a trunk.
-Frames are tagged internally once received on a port, and untagged when they are sent out the destination port. |
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Term
| What happens if a non-trunking port receives an 802.1Q frame? |
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Definition
| The tag field is ignored and the frame is switched normally at L2 with the Source and Destination MAC. |
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Term
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Definition
| Dynamic Trunking Protocol - used for negotiating trunking states. |
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Term
| What are the 5 DTP modes? |
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Definition
-Access, member of a single VLAN.
-Trunk, port attempts to negotiate trunking.
-Non-negotiate, port set to trunk but does NOT negotiate.
-Dynamic Desirable, Actively negotiates a trunk, and links if other side is Trunk, DD, or DA.
-Dynamic Auto. Passively waits for other side to negotiate trunk. Links if other side is trunk or DD. |
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Term
| How do you make a switchport into a trunk? |
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Definition
(if)
switchport mode [trunk, dyn auto, dyn des] |
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Term
| How do you set encapsulation methods on a trunk? |
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Definition
(if)
switchport trunk encapsulate [isl, dot1q, negotiate] |
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Term
| How do you set a native VLAN for a trunk port? |
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Definition
(if)
switchport trunk native vlan ## |
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Term
| How do you set a native VLAN for a trunk port? |
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Definition
(if)
switchport trunk native vlan ## |
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Term
| How do you set a trunk to allow only certain VLANs? |
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Definition
(if)
switchport trunk allowed vlan ##s |
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Term
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Definition
| VLAN Trunking Protocol, Cisco proprietary. |
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Term
| How often does VTP send out advertisements, by default, and what do they contain? |
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Definition
| Every 5 minutes, they contain the configuration revision number. |
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Term
| What are the three roles for a VTP switch? |
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Definition
-Server, create delete and rename.
-Client, cannot make changes.
-Transparent, local only create delete and rename. |
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Term
| If a switch recieves a VTP advertisement with a lower configuration revision number, what will it do? |
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Definition
| It will send the originator an update containing its higher revision number. |
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Term
| What are the differences between VTP version 1 and version 2? |
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Definition
| Version 2 supports Token Ring VLANs, transparent switches will pass both versions, and consistency checks are only performed when changes are manually configured. |
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Term
| What are the 4 commands to configure a switch for VTP? |
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Definition
(config)
vtp [server, client, transparent]
vtp domain NAME
vtp password PASSWORD
vtp version 2 |
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Term
| What are the steps to reset a configuration revision number for VTP? |
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Definition
| Disconnect the switch, set it to transparent, and delete the VLAN.DAT file. Then set it to a fake VTP domain and into client mode. Reboot! |
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Term
| What are the default ranges for VLAN numbers? |
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Definition
| 1-1005, with 1 being reserved for default, and 1002-1005 are reserved for legacy |
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Term
| What are the ranges for extended VLANs and when can they be used? |
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Definition
| 1-4094 and only on a switch in Transparent VTP mode. |
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Term
| What is contained in the ISL header and trailer when tagging a frame? |
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Definition
| a 15-bite VLAN ID field in the header, and a CRC value in the trailer. |
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Term
| What information is contained in the 802.1Q tag on a frame? |
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Definition
-The first two bytes are the the Tag-Protocol ID (always 0x8100 for dot1q).
-The second two bytes are for the Tag Control Info, that contain the three-bit priority field (for CoS/QoS) and the VLAN ID is the last 12-bits. |
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Term
| What is the definition of an 'Active' VLAN? |
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Definition
| One that has been defined and has ports assigned to carry it. |
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Term
| How often are DTP frames sent out on switchports? |
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Definition
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Term
| What switchport mode, when configured on BOTH ends, will never establish a trunk? |
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Definition
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Term
| VTP advertisements are sent as what type of frame? (Unicast, Broadcast, Multicast?) |
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Definition
| Multicast frames when there is a change. |
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Term
| What are the three types of VTP advertisements? |
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Definition
-Summary, send every 300 seconds or when a change occurs(like a heads-up)
-Subset, sent only when changes occur, and contain only the changes.
-Request, sent when a client needs info (like when it reboots or changes domains) |
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Term
| What command can be used to check on the configuration revision number in VTP? |
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Definition
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Term
| How many versions of VTP are there? |
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Definition
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Term
| Is VTP version 1 compatible with version 2? How do you enable version 2 across an entire VTP domain? |
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Definition
-No, version 2 is NOT compatible with version 1.
-Enabling VTP version 2 on the VTP server will enable it on all connected domain members capable of supporting it. |
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Term
| What VTP version do switches use by default? |
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Definition
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Term
| How do you enable vtp pruning? |
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Definition
(config)
vtp pruning.
Done on the server, this will enable it for an entire domain. |
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Term
| What command will tell an interface to prune VLANs from a trunk? |
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Definition
(if)
switchport trunk pruning vlan [add, except, remove, or none] |
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Term
| What is the command to remove a VTP password from a VTP Domain? |
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Definition
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Term
| What command displays Power over Ethernet information about a switch? |
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Definition
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Term
| How many classes of PoE are there, what are they, and what is the default class? |
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Definition
| There are 5 classes, 0-4, and 0 is default. |
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