CCNP switch slides 10 Flashcards
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http://www.coursehero.com/flashcards/430770/CCNP-SWITCH-642-813-VLAN-Implementation/
What are the two methods of identifying VLANs over trunk links? (i.e. trunking methods)
-ISL-802.1Q
VLANs separate what?
Broadcast domains.
How do you set a native VLAN for a trunk port?
(if)switchport trunk native vlan ##
If a switch recieves a VTP advertisement with a lower configuration revision number, what will it do?
It will send the originator an update containing its higher revision number.
How many classes of PoE are there, what are they, and what is the default class?
There are 5 classes, 0-4, and 0 is default.
How do you set encapsulation methods on a trunk?
(if)switchport trunk encapsulate [isl, dot1q, negotiate]
Is VTP version 1 compatible with version 2? How do you enable version 2 across an entire VTP domain?
-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.
What information is contained in the 802.1Q tag on a frame?
-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.
What is VTP?
VLAN Trunking Protocol, Cisco proprietary.
What is DTP?
Dynamic Trunking Protocol - used for negotiating trunking states.
What command will tell an interface to prune VLANs from a trunk?
(if)switchport trunk pruning vlan [add, except, remove, or none]
What is the definition of an ‘Active’ VLAN?
One that has been defined and has ports assigned to carry it.
What is the command to remove a VTP password from a VTP Domain?
(config)no vtp password
What are the two types of VLANs?
-End-to-End (Multi-switch VLANs)-Local (stays on single switch)
Define the difference between a physical subnet and a logical subnet.
-Physical, devices that share the same wire. -Logical, devices assigned to the same VLAN.
What are the three types of VTP advertisements?
-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)
When are frames tagged and untagged in trunking?
-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.
What command can be used to check on the configuration revision number in VTP?
show vtp status
VTP advertisements are sent as what type of frame? (Unicast, Broadcast, Multicast?)
Multicast frames when there is a change.
What switchport mode, when configured on BOTH ends, will never establish a trunk?
dynamic AUTO.
How do you enable vtp pruning?
(config)vtp pruning. Done on the server, this will enable it for an entire domain.
What are the VLAN show commands?
show vlan, show vlan brief, show vlan id ##, show vlan name NAME
What is the over-subscriber ratio of Access-to-Distribution and Distribution-to-Core?
A-D 20:1, D-C 4:1
What are the commands to create a VLAN?
(global) vlan ##, name MYNAME (optional)
What are the 5 DTP modes?
-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.
What are the three roles for a VTP switch?
-Server, create delete and rename.-Client, cannot make changes.-Transparent, local only create delete and rename.
How do you set a trunk to allow only certain VLANs?
(if)switchport trunk allowed vlan ##s
What happens if a non-trunking port receives an 802.1Q frame?
The tag field is ignored and the frame is switched normally at L2 with the Source and Destination MAC.
What VTP version do switches use by default?
Version 1.
How often does VTP send out advertisements, by default, and what do they contain?
Every 5 minutes, they contain the configuration revision number.
How do you make a switchport into a trunk?
(if)switchport mode [trunk, dyn auto, dyn des]
What are the 4 commands to configure a switch for VTP?
(config)vtp [server, client, transparent]vtp domain NAMEvtp password PASSWORDvtp version 2
How often are DTP frames sent out on switchports?
Every 30 Seconds.
What are the default ranges for VLAN numbers?
1-1005, with 1 being reserved for default, and 1002-1005 are reserved for legacy
What is contained in the ISL header and trailer when tagging a frame?
a 15-bite VLAN ID field in the header, and a CRC value in the trailer.
What are the commands to assign a port to a VLAN?
(if)switchport mode accessswitchport access vlan ##
What command displays Power over Ethernet information about a switch?
(exec)show power inline
What are the differences between VTP version 1 and version 2?
Version 2 supports Token Ring VLANs, transparent switches will pass both versions, and consistency checks are only performed when changes are manually configured.
What is 802.1Q?
-Standards-based trunking protocol.-inserts a field into the original frame after source MAC address field.-Supports Ethernet and Token Ring.
What are the ranges for extended VLANs and when can they be used?
1-4094 and only on a switch in Transparent VTP mode.
What is ISL?
-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.
