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CCNP Switch Practice > Key Term Practice > Flashcards

Key Term Practice Flashcards

1
Q

Collision Domain

A

The extent within a network that an Ethernet collision will be noticed or experienced

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2
Q

Flooding

A

An ethernet fram is replicated and sent out every available switch port

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3
Q

Unknown Unicast Flooding

A

The action taken by a switch when the destination MAC address cannot be found; the fram is flooded or replicated out all switch ports except the receiving port

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4
Q

CEF (Cisco Express Forwarding)

A

An efficient topology-based system for forwarding IP packets

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5
Q

FIB (Forward Information Base)

A

A CEF (Cisco Express Forwarding) database that contains the current routing table

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6
Q

CAM (Content Addressable Memory)

A

The high-performance table used by a swiwch to correlate MAC addresses with the switch interface where they can be found

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7
Q

TCAM (Ternary Content Addressable Memory)

A

A switching table found in Catalyst switches that is used to evaluate packet forwarding decisions based on policies or access lists. TCAM evaluation is performed simultaneously with the Layer 2 or Layer 3 forwarding decisions.

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8
Q

CSMA/CD

A

Carrier sens multiple access collision avoidance. The mechanism used in 802.11 WLANs by which clients attempt to avoid collisions.

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9
Q

Duplex mode

A

The ethernet mode that governs how devices can transmit over a connection-half duplex mode forces only one device to transmit at a time, as all devices share the same media; full-duplex mode is used when only two devices share the media, such that both devices can transmit simultaneously.

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10
Q

Autonegotiation

A

A mechanism used by a device and a switch port to automatically negotiate the link speed and duplex mode

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11
Q

Duplex mismatch

A

A condition where the devices on each end of a link use conflicting duplex modes

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12
Q

IEEE 802.3

A

The standard upon which all generations of Ethernet (Ethernet, Fast Ethernet, Gigabit ethernet, 10 Gigabit Ethernet) are based.

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13
Q

VLAN

A

Virtual LAN; a logical network existing on one or more Layer 2 switches, forming a single broadcast domain

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14
Q

broadcast domain

A

The extent of a network where a single broadcast frame or packet will be seen

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15
Q

VLAN number

A

A unique index number given to a VLAN on a switch, differentiating it from other VLANs on the switch

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16
Q

end-to-end VLAN

A

A single VLAN that spans the entire switched network, from one end to another

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17
Q

local VLAN

A

A single VLAN that is bounded by a small area of the network, situated locally with a group of member devices

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18
Q

20/80 rule

A

Network traffic pattern where 20 percent of traffic stays in a local area, while 80 percent travles to or from a remote resource

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19
Q

VLAN trunk

A

A physical link that can carry traffic on more than on VLAN through logical tagging

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20
Q

ISL

A

Inter-switch Link; a Cisco-proprietary method of tagging frames passing over a trunk link

21
Q

802.1Q

A

A method of passing frames and their VLAN associations over a trunk link, based on the IEEE 802.1Q standard

22
Q

DTP

A

Dynamic trunking protocol; a Cisco-proprietary method of negotiating a trunk link between two switches

23
Q

native VLAN

A

On an 802.1Q trunk link, frames associated with the native VLAN are not tagged at all

24
Q

VTP

A

VLAN trunking protocol; used to communicatet VLAN configuration information among a group of switches

25
Q

VTP domain

A

A logical grouping of switches that share a common set of VLAN requirements

26
Q

VTP configuration revision number

A

An index that indicates the current version of VLAN information used in the VTP domain; a higher number is more preferable

27
Q

VTP synchronization problem

A

An unexpected VTP advertisement with a higher configuration revision number is received, overriding valid information in the VTP domain

28
Q

VTP pruning

A

VTP reduces unnecessary flooded traffic by pruning or removing VLANs from a trunk link, only when there are no active hosts associated with the VLANs

29
Q

EtherChannel

A

A logical link made up of bundled or aggregated physical links

30
Q

PAgP

A

Port Aggregation Protocl; a Cisco-developed method for negotiating EtherChannels automotically

31
Q

LACP

A

Link aggregation Control Protocol; a standards based method for negotiating EtherChannels automatically

32
Q

transparent bridge

A

A network device that isolates two physical LANs but forwards Ethernet frames between them

33
Q

bridging loop

A

A condition where Ethernet frames are forwarded endlessly around a layer 2 loop formed between switches

34
Q

Spanning Tree Protocol (STP)

A

A protocol communicated between layer 2 switches that attempts to detect a loop in the topology before it forms, thus preventing a bridging loop from occuring

35
Q

BPDU

A

Bridge protocol data unit; the data message exchanged by switches participating in the Spanning Tree Protocol

36
Q

root bridge

A

The single STP device that is elected as a common frame of reference for working out a loop-free topology

37
Q

root port

A

Each switch selects one port that has the lowest root path cost leading toward the root bridge

38
Q

root path cost

A

The cumulative cost of all the links leading to the root bridge

39
Q

designated port

A

One nonroot port selected on a network segment, such that only one switch forwards traffic to and from the segment

40
Q

hello time

A

The time interval between configuration BPDUs sent by the root bridge defaults to 2 seconds

41
Q

Forward Delay

A

The time interval that a switch spends in the listening and learning states; default 15 seconds

42
Q

Max Age time

A

The time interval that a switch stores a BPDU before discarding it or aging it out; the default is 20 seconds

43
Q

TCN

A

Topology Change Notification; a message sent out the root port of a switch when it detects a port moving into the Forwarding state or back into the Blocking state. The TCN is sent toward the root bridge, where it is reflected and propagated to every other switch in the layer 2 network

44
Q

Common Spanning Tree (CST)

A

A single instance of STP defined in the IEEE 802.1Q standard

45
Q

PVST

A

Per-VLAN Spanning Tree; a Cisco-proprietary version of STP where one instance of STP runs on each VLAN present in a layer 2 switch

46
Q

PVST+

A

Per-VLAN spanning tree plus; a cisco proprietary version of PVST that enables PVST, PVST+, and CST to interoperate on a switch

47
Q

PortFast

A

An STP featrue used on a host port, where a single host is connected, that shortens the Listening and Learning states so that the host can gain quick access to the network

48
Q

UplinkFast

A

An STP feature that enables access layer switches to unblock a redundant uplink when the primary root port fails

49
Q

BackboneFast

A

An STP feature that can detect an indirect link failure and shorten the STP convergence time to 30 seconds by bypassing the Max Age timeout period

CCNP Switch Practice (4 decks)

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