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CISCO CCNA > Chap2er 1-4 > Flashcards

Chap2er 1-4 Flashcards

Sem 2 Chap 1-4

1
Q

Switch recieves frame w unknown dest address. What happens?

A

Adds source MAC to table, forwards out of all ports except ingress

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2
Q

Switch component that reduces packet handling time

A

ASIC

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3
Q

Switching method that ensures frame is error-free

A

store-and-forward

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4
Q

Switching method without error checking

A

cut-through

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5
Q

What are frame forwarding decisions based on

A

MAC address and port mappings in CAM table

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6
Q

Difference between hub and switch

A

hub extends collision domain, switch divides collision domains

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7
Q

How many broadcast domains? (4 routers connected to hosts, each connected to a central router)

A

8

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8
Q

What impact does adding a switch have on a network

A

increases size of broadcast domain

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9
Q

How do switch buffers affect network performance

A

Store frames received, prevents premature frame discarding

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10
Q

Switch characteristic that keeps network local and alleviates network congestion

A

high port density

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11
Q

What happens when a device in a VLAN sends a broadcast frame

A

only devices in that VLAN see the frame

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12
Q

Characteristics of the native VLAN

A

traffic is untagged across the trunk, provides a common identifier to both ends of the trunk

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13
Q

VLAN designed to have <150ms delay

A

voice VLAN

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14
Q

VLAN used to separate networks into groups of users/devices

A

data VLAN

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15
Q

VLAN configured for SSH/Telnet/HTTPS/HTTP/SMTP

A

management VLAN

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16
Q

VLAN used to designate which traffic is untagged

A

native VLAN

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17
Q

VLAN type

A

a value for the tag protocol id value

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18
Q

VLAN ID

A

a VLAN number

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19
Q

VLAN User priority

A

a value that supports level or service implementation (QoS)

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20
Q

VLAN canonical format identifier

A

identifier that enables token ring frames to be carried across ethernet links

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21
Q

T/F: The command to assign a voice VLAN is switchport access vlan

A

FALSE

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22
Q

Four steps to configure voice VLAN

A

Add voice vlan, configure switch port in access mode, Assign voice vlan to source port, ensure voice traffic is trusted and tagged with CoS priority value

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23
Q

Output of show vlan brief

A

VLAN assignment and membership for all switch ports

24
Q

Impact of no switchport access command

A

port is returned to vlan 1

25
Q

What happens to switch ports after the VLAN to which they are assigned is deleted

A

ports stop communicating with the attached devices (the twilight zone)

26
Q

Command to display encapsulation type, voice VLAN ID, and access mode VLAN for Fa0/1

A

show int Fa0/1 switchport

27
Q

Why would interfaces be missing from show vlan brief

A

they’re configured as trunks

28
Q

To be available, an interface must be

A

configured with an ip, manually activated

29
Q

After which step of the switch bootup sequence is the boot loader executed

A

after POST execution

30
Q

What does a switch use to locate and load the IOS image?

A

BOOT environment variable

31
Q

Command used to set BOOT environment variable

A

boot system

32
Q

Effect of “ip address” in interface config of switch

A

applies ipv4 address to virtual interface

33
Q

If one end of ethernet is full-duplex and the other is half-duplex, where will collisions occur

A

at the half-duplex end

34
Q

Command that displays info abt auto-mdix

A

show controllers

35
Q

Runt frames are frames that are less than ___ bytes

A

64

36
Q

T/F: The transport input all command will only allow ssh connections

A

FALSE

37
Q

In order to be available, an interface must be

A

configured with at least one ip, activated with no shut

38
Q

Characteristic of IPV4 loopback interface

A

logical interface internal to the router

39
Q

DTP dynamic desirable

A

actively attempts to convert the link into a trunk

40
Q

DTP dynamic auto

A

passively waits for neighbor to initiate trunking

41
Q

DTP nonegociate

A

requires manual config of trunking/non-trunking

42
Q

DTP trunk

A

permanent trunking mode

43
Q

What mode should the router port be in if Cisco best practices are being used

A

trunk

44
Q

Under what occasions should an admin disable DTP

A

when connecting cisco switch to non-cisco switch, on links that should not be trunking

45
Q

Refer to the infographic where the workstations are on vlan 20. What is the problem

A

allow vlan 20 on the trunk link

46
Q

Disadvantages of router-on-a-stick

A

dedicated router required, lower traffic flow speed

47
Q

Correct statements regarding layer 3 switches (SVI inter-vlan)

A

switching packets is faster, no need for connection with router

48
Q

What is required for communication between vlans (router-on-a-stick topology)

A

switch with router port configured as a trunk

49
Q

What does in encapsulation dotiq mean

A

VLAN number

50
Q

What command allows inter-vlan routing on a router

A

switchport mode trunk

51
Q

What is the cause of the error “Configuring IP routing on a LAN… 802.1Q, or ISL VLAN”

A

missing encapsulation dot1q <>

52
Q

What’s the problem in the exhibit with vlans 20,30, and 40 on RT1?

A

IP on sub-interfaces are incorrectly matched to VLANs

53
Q

What kind of port is required for inter-vlan routing

A

trunk port

54
Q

Characteristic of routed port on L3 switch

A

not assigned to a VLAN

55
Q

What does in encapsulation dot1q mean

A

VLAN number

56
Q

Problems in Gi1/1 exhibit

A

Gi1/1 is the default VLAN, Gi1/1 is configured as a turnk

57
Q

How to do packet tracer

A

fix router-on-a-stick

CISCO CCNA (3 decks)

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