CCNP switch slides 1

Question 1

Each switch port is a _____ ______

Answer 1

collision domain

Question 2

What is unknown unicast flooding

Answer 2

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.

Question 3

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

Answer 3

because each frame is checked

Question 4

Where are security and QoS ACLs stored?

Answer 4

TCAM

Question 5

What is route caching?

Answer 5

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

Question 6

What is topology-based caching?

Answer 6

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

Question 7

How often are CAM table entries aged?

Answer 7

300 sec

Question 8

CAM table entries are purged when….

Answer 8

a MAC is seen on a different port

Question 9

What is the FM?

Answer 9

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

Question 10

What is the SDM?

Answer 10

Switching Database Manager - configures and prunes TCAM partitions

Question 11

What are TCAM entries composed of?

Answer 11

value, mask, and result (VMR) combinations

Question 12

What is the size of a TCAM value?

Answer 12

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

Question 13

How long are TCAM masks?

Answer 13

134 bits

Question 14

What are LOU register pairs?

Answer 14

used when ACLs specify port ranges…used by TCAM

Question 15

What is a 10GE WAN PHY?

Answer 15

Connects with SONET or SDH

Question 16

What pins does FE use?

Answer 16

1/2 and 3/6

Question 17

What cabling do GBICs use?

Answer 17

SC fiber or RJ-45

Question 18

Which fiber is the receive?

Answer 18

on the left as you face the connector

Question 19

What types of ports autonegotiate?

Answer 19

FE and GE

Question 20

What is the default 10mbps Enet duplex?

Answer 20

half-duplex

Question 21

What is the default FE duplex?

Answer 21

Full duplex

Question 22

How are errdisable triggers tuned?

Answer 22

globally

Question 23

what is errdisable dtp-flap?

Answer 23

change in trunk encap

Question 24

what is errdisable pagp-flap?

Answer 24

etherchannel ports have inconsistent config

Question 25

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

Answer 25

manually

Question 26

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

Answer 26

300 sec by default

Question 27

How do you find duplex mismatches?

Answer 27

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

Question 28

what is a vlan?

Answer 28

a single broadcast domain

Question 29

static vlans offer ____ based membership

Answer 29

port

Question 30

the static port to vlan membership is handled in _____

Answer 30

the ASIC

Question 31

What is the default MTU?

Answer 31

1500B

Question 32

What is the acceptible range of VLANS?

Answer 32

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

Question 33

What are dynamic VLANs based on?

Answer 33

MAC of the end device

Question 34

One vlan should =

Answer 34

1 IP subnet

Question 35

What is an end to end vlan?

Answer 35

a VLAN that spans the entire fabric

Question 36

What is the 80/20 rule?

Answer 36

80% of the user traffic should stay in the VLAN

Question 37

How does ISL do framing on trunks?

Answer 37

by encapsulating each frame in a header and trailer

Question 38

What types of links can be trunked?

Answer 38

FE, GE, and aggregated FE/GE Etherchannels

Question 39

How does dot1q do framing on trunks?

Answer 39

embeds the tag within the frame

Question 40

What is the size of ISL encapsulation?

Answer 40

26-byte header, 4-byte trailer with CRC

Question 41

What is a baby giant frame?

Answer 41

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

Question 42

What does DTP do?

Answer 42

automatically negotiates a common trunk mode between switches

Question 43

What are the 3 trunk encap modes?

Answer 43

isl, dot1q, negotiate (default

Question 44

What are the 3 trunk switchport modes?

Answer 44

trunk, dynamic auto, dynamic desireable (default)

Question 45

what is dynamic desireable?

Answer 45

the port asks the other end to trunk

Question 46

what is dynamic auto?

Answer 46

will trunk if asked

Question 47

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

Answer 47

switchport nonegotiate

Question 48

Which 4 things must be agreeable to trunk?

Answer 48

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

Question 49

What is the default VTP state?

Answer 49

VTP server for domain null with no password or secure mode

Question 50

What are 2 ways to configure VLAN and VTP information?

Answer 50

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