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CCNP Switch > CCNP switch slides 1 > Flashcards

CCNP switch slides 1 Flashcards

1
Q

Each switch port is a _____ ______

A

collision domain

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2
Q

What is unknown unicast flooding

A

MAC addresses are learned from the source MAC of incoming frames. If the destination address is unknown, the frame is flooded out all except the receiving port.

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3
Q

When a host is connected to a switchport, why aren’t frame errors propagated?

A

because each frame is checked

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4
Q

Where are security and QoS ACLs stored?

A

TCAM

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5
Q

What is route caching?

A

The RP listens to a flow’s 1st packet for the dest. The SE listens to the packet and dest and puts a shortcut in the MSL cache. Netflow switching, route once, switch many

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6
Q

What is topology-based caching?

A

the topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding

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7
Q

How often are CAM table entries aged?

A

300 sec

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8
Q

CAM table entries are purged when….

A

a MAC is seen on a different port

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9
Q

What is the FM?

A

Feature Manager - after the ACL is created, the FM compiles the ACEs into the table

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10
Q

What is the SDM?

A

Switching Database Manager - configures and prunes TCAM partitions

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11
Q

What are TCAM entries composed of?

A

value, mask, and result (VMR) combinations

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12
Q

What is the size of a TCAM value?

A

134 bits, consisting of source and destination addresses and protocol information from the packet or frame

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13
Q

How long are TCAM masks?

A

134 bits

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14
Q

What are LOU register pairs?

A

used when ACLs specify port ranges…used by TCAM

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15
Q

What is a 10GE WAN PHY?

A

Connects with SONET or SDH

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16
Q

What pins does FE use?

A

1/2 and 3/6

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17
Q

What cabling do GBICs use?

A

SC fiber or RJ-45

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18
Q

Which fiber is the receive?

A

on the left as you face the connector

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19
Q

What types of ports autonegotiate?

A

FE and GE

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20
Q

What is the default 10mbps Enet duplex?

A

half-duplex

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21
Q

What is the default FE duplex?

A

Full duplex

22
Q

How are errdisable triggers tuned?

A

globally

23
Q

what is errdisable dtp-flap?

A

change in trunk encap

24
Q

what is errdisable pagp-flap?

A

etherchannel ports have inconsistent config

25
Q

How do you renable an err-disable port by default?

A

manually

26
Q

If a port is configured for errdisable auto recovery, how long does it stay down?

A

300 sec by default

27
Q

How do you find duplex mismatches?

A

use sh interface on the interface and look for error counts > 10

28
Q

what is a vlan?

A

a single broadcast domain

29
Q

static vlans offer ____ based membership

A

port

30
Q

the static port to vlan membership is handled in _____

A

the ASIC

31
Q

What is the default MTU?

A

1500B

32
Q

What is the acceptible range of VLANS?

A

1-1005 (1 and 1002-1005 are reserved)

33
Q

What are dynamic VLANs based on?

A

MAC of the end device

34
Q

One vlan should =

A

1 IP subnet

35
Q

What is an end to end vlan?

A

a VLAN that spans the entire fabric

36
Q

What is the 80/20 rule?

A

80% of the user traffic should stay in the VLAN

37
Q

How does ISL do framing on trunks?

A

by encapsulating each frame in a header and trailer

38
Q

What types of links can be trunked?

A

FE, GE, and aggregated FE/GE Etherchannels

39
Q

How does dot1q do framing on trunks?

A

embeds the tag within the frame

40
Q

What is the size of ISL encapsulation?

A

26-byte header, 4-byte trailer with CRC

41
Q

What is a baby giant frame?

A

frames that barely exceed 1518B or 1622B due to headers

42
Q

What does DTP do?

A

automatically negotiates a common trunk mode between switches

43
Q

What are the 3 trunk encap modes?

A

isl, dot1q, negotiate (default

44
Q

What are the 3 trunk switchport modes?

A

trunk, dynamic auto, dynamic desireable (default)

45
Q

what is dynamic desireable?

A

the port asks the other end to trunk

46
Q

what is dynamic auto?

A

will trunk if asked

47
Q

How do you disable DTP when you configure both ends of the ISL manually?

A

switchport nonegotiate

48
Q

Which 4 things must be agreeable to trunk?

A

1- trunking mode, 2-trunk encapsulation, 3-native VLAN, 4-allowed VLAN

49
Q

What is the default VTP state?

A

VTP server for domain null with no password or secure mode

50
Q

What are 2 ways to configure VLAN and VTP information?

A

Global config (vlan, vtp mode, and vtp domain) and VLAN DB mode commands. Global config is preferred because VLAN DB mode commands are legacy

CCNP Switch (16 decks)

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